Gotowe bibliografie tematyczne / SEED VIGOUR

Spis treści

Artykuły w czasopismach
Rozprawy doktorskie
Książki
Części książek
Streszczenia konferencji
Raporty organizacyjne

Gotowa bibliografia na temat „SEED VIGOUR”

Autor: Grafiati

Data publikacji: 8 września 2023

Data aktualizacji: 18 maja 2024

Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych

Wybierz rodzaj źródła:

Zobacz listy aktualnych artykułów, książek, rozpraw, streszczeń i innych źródeł naukowych na temat „SEED VIGOUR”.

Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.

Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.

Artykuły w czasopismach na temat "SEED VIGOUR"

Nikolić, Zorica, Zlatica Miladinov, Sanja Vasiljević, Snežana Katanski, Gordana Tamindžić, Dragana Milošević i Gordana Petrović. "Legume vigour". Acta agriculturae Serbica 26, nr 51 (2021): 19–26. http://dx.doi.org/10.5937/aaser2151019n.

Pełny tekst źródła

Streszczenie:

Seed vitality and vigour are the two most common parameters related to seed quality. It is crucial to have reliable methods and tests for seed quality and seed vigour testing. The standard germination test can be used to predict field emergence, but laboratory seed testing conditions are often in conflict with field conditions. Validated tests for vigour evaluation in legumes are the conductivity test, the accelerated ageing test and the tetrazolium test. Also, other types of vigour tests have been used to solve different problems in the seed sector. The modern approach, the computerised image analysis of legume seeds and sprouts, based on interactive and traditional methods, is a promising alternative for vigour determination.

Style APA, Harvard, Vancouver, ISO itp.

Hassan, Fatima A., i Mai M. A. Hassan. "The Use of Seed Vigour Tests for Predicting Field Emergence". International Journal of Applied Science 1, nr 2 (19.12.2018): p93. http://dx.doi.org/10.30560/ijas.v1n2p93.

Pełny tekst źródła

Streszczenie:

The general aim of this study was to address the problem of seed vigour testing in Acacia senegal and Acacia mellifera) by studying different seed vigour tests and comparing them to identify the most suitable test for each species. The importance of this study lies in the fact that vigour testing measures the percentage of viable seeds in a sample as well as their ability to produce normal seedlings under less than optimum or adverse growing conditions, similar to those occurring in the field. To achieve this objective, a set of laboratory and field tests were conducted for the two Acacia species. Data collected included: The number of seeds per kilogram, germination percentage, seedling shoot length, seedling root length, seedling root wet and dry weight, seedling shoot wet and dry weight. The cutting test, electrical conductivity tetrazolium test and Hiltner test were employed to determine the seed vigour. The results showed that Acacia mellifera had a high electrical conductivity, indicating its low seed vigour. The electrical conductivity of Acacia senegal was equivalent to that of distilled water, indicating that either the seed coat was intact or no ions were leached from the seeds. Comparison of the various tests suggests that Hiltner test is the most accurate” or “reliable”) test for seed vigor.

Style APA, Harvard, Vancouver, ISO itp.

Verma, Omvati, i RS Verma. "Effect of seed coating material and storage containers on Germination and seedling Vigour of soybean (Glycine max L.)". SAARC Journal of Agriculture 12, nr 2 (6.02.2015): 16–24. http://dx.doi.org/10.3329/sja.v12i2.21913.

Pełny tekst źródła

Streszczenie:

A laboratory experiment was conducted to evaluate the effect of different seed coating materials and storage containers on germination, seedling vigour and suitability of packaging material for soybean seed. Seed of soybean varietyPS1024 was used for coating purpose with 6 coating treatments viz., T0 (control), T1 (Polymer coating i.e. Polykote @ 3 ml kg-1 of seed diluted with 5 ml of water), T2 (Flowable Thiram i.e. Royal flow 40 SC @ 2.4 ml kg-1 of seed), T3 (T1 + T2), T4 (Vitavax 200 i.e.thiram 37.5 % and carboxyl 37.5% @ 2 g kg-1 of seed and T5(T1+ T4). The coated seeds were stored in two kinds of containers i.e. jute canvas bag, high density poly ethylene (HDPE) non- laminated bag and bimonthly observation on germination and seedling vigour were recorded. After 8th month of storage, germination and vigour index in polythene bag stored seeds were significantly higher than the seed stored in cloth bag. Among seed coating treatments, maximum %germination was recorded in polymer coating @ 3 ml kg-1 followed by vitavax 200 @ 2 g kg-1of seed treatment (T5) which was significantly higher than rest of the coated treatment including untreated control seeds (T0 ). Similarly, maximum seed vigour index was observed in T5 and minimum vigor index was recorded with T0 (untreated control). DOI: http://dx.doi.org/10.3329/sja.v12i2.21913 SAARC J. Agri., 12(2): 16-24 (2014)

Style APA, Harvard, Vancouver, ISO itp.

Jayasuriya, K. M. G. Gehan, Jerry M. Baskin, Dennis M. Tekrony i Carol C. Baskin. "Sensitivity cycling to physical dormancy break and seed vigour of twoIpomoeaspecies (Convolvulaceae)". Seed Science Research 19, nr 4 (grudzień 2009): 249–59. http://dx.doi.org/10.1017/s0960258509990158.

Pełny tekst źródła

Streszczenie:

AbstractThe physically dormant seeds ofIpomoea lacunosaand ofI. hederaceaundergo sensitivity cycling (insensitive ↔ sensitive) to dormancy-breaking treatment. Sensitivity cycling is important to seeds with physical dormancy in sensing appropriate environmental conditions for germination. Seed vigour is also important to seedling establishment, but no study has compared changes in vigour (or not) with changes in sensitivity. This study was conducted to determine the relationship between sensitivity cycling and seed vigour inI. lacunosaandI. hederacea. The seed moisture contents of insensitive and sensitive seeds ofI. lacunosaand of sensitive seeds ofI. hederaceawere measured, and several vigour tests were performed. Vigour of sensitive seeds ofI. lacunosadecreased more rapidly than that of insensitive seeds. No significant change in vigour was observed in either permeable or impermeable seeds ofI. hederacea. We conclude that sensitivity cycling to physical dormancy break is important in maintaining vigour ofI. lacunosaseeds in the soil seed-bank.

Style APA, Harvard, Vancouver, ISO itp.

Kanwar, Rajesh, i D. K. Mehta. "Studies on solid matrix priming of seeds in bitter gourd (Momordica charantia L.)". Journal of Applied and Natural Science 9, nr 1 (1.03.2017): 395–401. http://dx.doi.org/10.31018/jans.v9i1.1202.

Pełny tekst źródła

Streszczenie:

A study was carried out to evaluate the effect of solid matrix priming of seeds on emergence (%), growth and fruit yield characters of bitter gourd (Momordica charantia L.) cultivar ‘Solan Hara’. The Experiment comprised of two vigour groups of seeds viz., ‘V1’ (High vigour seeds) and ‘V2’ (72 hours accelerated aged seeds/low vigour seeds) and five seed priming treatments viz., ‘P1’ (Solid matrix priming with Cocopeat), ‘P2’ (Solid matrix priming with Perlite), ‘P3’ (Solid matrix priming with Vermiculite), ‘P4’ (Seed soaking in water), ‘P5’ (Control -Without treatment).Investigation proved that low vigour seeds were inferior in respect of high vigour seeds in terms of seed physiological quality, emergence, growth and yield characteristics. Seed priming with Perlite for 72 hours proved its potential over other priming treatments, seed soaking and control (non-primed seeds) in both high vigour and low vigour seeds for agronomic attributes under study. High vigour seeds primed with Perlite ‘V1P2’ was found to be the best treatment for most of the traits understudy recording highest total field emergence (76.60%), fruit yield per plot (16.12 Kg) and per hectare (250.35 q). Similarly, Low vigour seeds primed with Perlite also recorded enhanced and improved total field emergence (73.83%) fruit yield per plot (9.28 Kg) and per hectare (143.26 q) compared to other low vigour treated and non treated seeds. From the present investigation it was inferred that that the extent of improvement w.r.t. attributes studied was more in low vigour seeds (V2) and seed priming with solid matrix carrier ‘Perlite’ can be used as a beneficial pre-sowing treatment to enhance the seedling emergence, growth and yield characteristics in bitter gourd.

Style APA, Harvard, Vancouver, ISO itp.

Santos, Juliana F., Lynnette M. A. Dirk, A. Bruce Downie, Mauricio F. G. Sanches i Roberval D. Vieira. "Reciprocal effect of parental lines on the physiological potential and seed composition of corn hybrid seeds". Seed Science Research 27, nr 3 (24.04.2017): 206–16. http://dx.doi.org/10.1017/s0960258517000095.

Pełny tekst źródła

Streszczenie:

AbstractObtaining corn hybrid seeds (Zea mays L.) with high vigour depends on the parental lines and the direction of the cross, and this relates to seed desiccation tolerance and composition. This research studied reciprocal crosses between pairs of proprietary, elite parent lines (L1 and L5; L2 and L4) producing hybrid seeds with different qualities attempting to correlate vigour with seed composition, focusing on storage proteins, starch and soluble sugar amounts. Four corn hybrid seed lots produced from reciprocal crosses were compared (HS 15 with HS 51, and HS 24 with HS 42) by assessing germination, vigour, and seedling emergence in the field. Seed composition was assessed in mature, dehydrated seeds. Proteins were extracted, quantified, and analysed by electrophoresis and densitometry. Starch amounts were assessed using a kit and soluble sugars were determined using high performance liquid chromatography with pulsed electrochemical detection. The L1 and L2 lineages, used as female parents, provided seeds with lower vigour; however, the quantification of major protein bands, and sucrose, raffinose and stachyose were similar between seed lot pairs. While both total seed protein and starch varied between reciprocal hybrids for one of the two sets of crosses, the amounts of neither correlated with seed vigour. Interestingly, hybrids with low seed vigour (HS 15, HS 24) accumulated greater amounts of fructose relative to their reciprocal; correlation analysis confirmed these results. We demonstrate different effects on seed vigour dependent on the maternal parent in reciprocal crosses producing hybrid corn seeds. We also show that vigour is negatively correlated with seed reducing sugar contents.

Style APA, Harvard, Vancouver, ISO itp.

Al-Amery, Maythem, Robert L. Geneve, Mauricio F. Sanches, Paul R. Armstrong, Elizabeth B. Maghirang, Chad Lee, Roberval D. Vieira i David F. Hildebrand. "Near-infrared spectroscopy used to predict soybean seed germination and vigour". Seed Science Research 28, nr 3 (11.05.2018): 245–52. http://dx.doi.org/10.1017/s0960258518000119.

Pełny tekst źródła

Streszczenie:

AbstractRapid, non-destructive methods for measuring seed germination and vigour are valuable. Standard germination and seed vigour were determined using 81 soybean seed lots. From these data, seed lots were separated into high and low germinating seed lots as well as high, medium and low vigour seed lots. Near-infrared spectra (950–1650 nm) were collected for training and validation samples for each seed category and used to create partial least squares (PLS) prediction models. For both germination and vigour, qualitative models provided better discrimination of high and low performing seed lots compared with quantitative models. The qualitative germination prediction models correctly identified low and high germination seed lots with an accuracy between 85.7 and 89.7%. For seed vigour, qualitative predictions for the 3-category (low, medium and high vigour) models could not adequately separate high and medium vigour seeds. However, the 2-category (low, medium plus high vigour) prediction models could correctly identify low vigour seed lots between 80 and 100% and the medium plus high vigour seed lots between 96.3 and 96.6%. To our knowledge, the current study is the first to provide near-infrared spectroscopy (NIRS)-based predictive models using agronomically meaningful cut-offs for standard germination and vigour on a commercial scale using over 80 seed lots.

Style APA, Harvard, Vancouver, ISO itp.

Mellish and B. Coulman, A. "Seed weight, emergence and seedling vigour of four tetraploid crested wheatgrass populations". Canadian Journal of Plant Science 83, nr 1 (1.01.2003): 69–70. http://dx.doi.org/10.4141/p01-119.

Pełny tekst źródła

Streszczenie:

This study compared the seed weight, and seedling emergence vigor of four tetraploid crested wheatgrass populations. S9240H, a population selected for seed size, had larger seeds than the cultivars Kirk and CD-II. Heavy seeds had greater emergence and heavier seedlings than light seeds, but there were no differences in these characters among the four populations. Key words: Crested wheatgrass, seed size, seedling vigour

Style APA, Harvard, Vancouver, ISO itp.

P, SRIMATHI, i RAMASAMY K.R. "QUALITY OF SEED IN RELATION TO POSITION OF SEED IN THE PODS OF COWPEA". Madras Agricultural Journal 79, Augest (1992): 448–50. http://dx.doi.org/10.29321/maj.10.a01778.

Pełny tekst źródła

Streszczenie:

Quality estimation of the seeds of cowpea cv Co2 collected from different positions of the seed in the pods were made. The estimations viz; seed size, weight, germination and vigour of the seeds collected from the distal and other portions did not vary widely excepting the reduced vigour of the seedlings of smaller sized seed. The distal and seeds recorded higher germination and lower vigour compared to others.

Style APA, Harvard, Vancouver, ISO itp.

Dryha, V. V., V. A. Doronin, Yu A. Kravchenko, V. V. Doronin i S. D. Orlov. "The effect of the storage conditions on the quality of switchgrass seeds of different 1000-kernel weight". Scientific Papers of the Institute of Bioenergy Crops and Sugar Beet, nr 30 (26.12.2022): 26–32. http://dx.doi.org/10.47414/np.30.2022.269016.

Pełny tekst źródła

Streszczenie:

Purpose. Revealing the effect of the storage conditions for switchgrass seeds of different varieties and 1000-kernel weight on germination and seed vigour. Methods. Laboratory (determination of seed vigour and seed germination), measurement and weighting (determination of the 1000-kernel weight), and mathematical and statistical methods were used in the research. Results. It has been proven that seed vigour and germination naturally decreased along with a decrease in the 1000-kernel weight. On average, the lowest quality indicators were obtained for the seeds with the 1000-kernel weight of 1.24 g, however, during eight months of its storage, no natural decrease in the seed vigour and germination occurred. The quality of seeds with a greater 1000-kernel weight (1.67 g) was significantly higher and amounted to 55 and 58%. The smaller 1000-kernel weight, the lower was seed vigour and germination during storage for three and eight months was observed. No significant increase or decrease in seed quality was found depending on the 1000-kernel weight and the storage period. Similar results of the seed quality were obtained in the seed samples of different varieties. Seeds ‘Cave-in-rock’ variety with a 1000-kernel weight of 0.63 g had the lowest germination vigour, both at the beginning of the experiment and during eight months of storage; however, it did not depend on the storage period. Conclusions. On average of variety samples, a natural increase in seed vigour and germination occurs along with an increase in the 1000-kernel weight. At the same time, a natural increase in the seed quality of different 1000-kernel weight depending on the storage period was not found. On the contrary, seed vigour and germination were lower than in the control (at placing seeds for storage).

Style APA, Harvard, Vancouver, ISO itp.

Więcej źródeł

Rozprawy doktorskie na temat "SEED VIGOUR"

Leeks, C. R. F. "Determining seed vigour in selected Brassica species". Lincoln University, 2006. http://hdl.handle.net/10182/1274.

Pełny tekst źródła

Streszczenie:

Variables for the accelerated ageing (AA) test, methods for reducing fungal contamination during the AA test, using the conductivity test as a vigour test, the effect of seed size on seed vigour and the relationship between laboratory test results and field perfonnance in selected Brassica spp were investigated. In the first experiment, three seed lots of turnip rape hybrid (B. rapa x campestris), turnip (B. campestris) and forage rape (B. napus); and seven seed lots of Asian rape (B. napus), six seed lots of Asian kale (B. oleraceae var. alboglabra L.) and five seed lots of choisum (B. rapa var. pekinensis) with germinations above 90% were aged at two different temperatures (41 and 42°C ± 0.3°C) and three ageing times (24, 48 and 72 ± 15 minutes). The second experiment was divided into three sections. In the first, the same seed lots and species were aged at one temperature (41°C) and time (72 h), but either 40 ml of saturated salts; KCl (83%RH), NaCl (76%RH), NaBr (55%RH); or distilled water (96%RH) were used as the ageing solutions. In the second, one turnip rape hyprid seed lot was aged at three temperatures (41, 42 and 45°C) and two times (72 and 96h), again using the three saturated salts and distilled water as ageing solutions. In the third, three turnip rape hybrid seed lots and three Asian kale seed lots were surface sterilised (1 % sodium hypochlorite) prior to ageing at one temperature (41°C) and time (72 h). In the third experiment, the same species and seed lots used in experiment one at their original seed moisture content (SMC) were tested for conductivity after soaking in deionised water for 4, 8, 12, 16, 20 and 24 h. They were then re-tested after the SMC had been adjusted to 8.5%. In the fourth experiment, three seed lots of forage rape and three seed lots of Asian kale were graded into three seed size categories; large (retained on a 2.0 mm screen), medium (retained on a 1.7 mm screen) and small (passed through a 1.7 mm screen). Graded seeds were then tested for standard germination, AA (41°C/48 h) and conductivity (measured at 16 and 24 h). In the final experiment, the relationships between laboratory tests for the six species (each consisting of three seed lots), field emergence from three sowings, and cold room emergence were evaluated. Both time and temperature influenced post-AA germination. Increasing the ageing period from 48 to 72 hours at 41°C, and 24 to 48 hours at 42°C resulted in decreased mean germination percentage for all species but not always clear separation of seed lots. While there were sometimes few differences between ageing at 41°C and 42°C, the former is preferred because it is already the temperature used for other species. For Asian rape, choisum and turnip, the previously recommended testing conditions of 41°C/72 h provided good seed lot separation, but for Asian kale and turnip rape hybrid, AA testing at 41°C/48 h provided better results. Seed moisture content after ageing ranged from 29-37% depending on species. Fungal growth on seeds during the ageing period appeared to reduce post-ageing germination in some seed lots . Substituting saturated salts for distilled water did not stress seed lots in the AA test, due to the lowered RH%, the exception being seed lots 1210 and 1296. For forage and Asian species, seed lot germination mostly remained above 90% when aged for 72 h at lowered RH%. Increasing the ageing duration from 72 to 96 hours resulted in some decreases in post-AA germination but no clear separation of seed lots. Surface sterilising the seeds prior to the AA test resulted in a lower incidence of contaminant fungi which was associated with a lower percentage of abnormal seedlings. The conductivity test was mostly able to identify vigour differences among forage and Asian vegetable brassica seed lots. Differences in conductivity readings were observed among seed lots in all species. Increasing the period of imbibition resulted in increased conductivity from most seed lots but radicle emergence occurred after 16-20 h of imbibition. Variation was observed in the time to reach 95% maximum of the imbibition curve for most species. Conductivity readings at 16 h would avoid possible influences of radicle emergence on results. Adjusting the SMC to 8.5% resulted in reduced variation in conductivity among replicates of seed lots, due to a reduction in imbibition damage. Seed size had a significant effect on both post-AA germination and conductivity results. In forage rape, large size seeds had higher post-AA germination cf. medium cf. small size seeds. In Asian kale, large size seeds had higher post-AA germination compared with small size seeds. For both forage rape and Asian kale, large size seeds had lower conductivity readings cf. small size seeds. The correlation analyses demonstrated significant relationships between AA testing and field emergence parameters (percentage emergence, emergence index and emergence rate). Significant relationships were also observed between conductivity testing and these field emergence parameters. Based on the correlation analysis, AA testing at 41°C/48 hand/or 42°C/48 h could be recommended to be used as an AA test for turnip and Asian rape; and 41°C/48 hand/or 41°C/72 h for Asian kale and choisum. Based on the correlation analysis, conductivity testing at 16 h can be used to predict the field emergence potential of forage and Asian vegetable seed lots. Vigour tests were consistently able to provide better indicators of field perfonnance than the standard germination test, although these relationships did vary with the different field sowings.

Style APA, Harvard, Vancouver, ISO itp.

Kandolo, Sadiki Delphin. "Effect of fungicide seed treatments on germination and vigour of maize seed". Diss., University of Pretoria, 2008. http://hdl.handle.net/2263/29544.

Pełny tekst źródła

Streszczenie:

Fungicides have been developed to protect plants against diseases and pests, which cause serious problems such as the loss of germination and vigour. The aim of this study was to test the germination and vigour of maize (Zea mays L.) seeds treated with several fungicides Apron® Star 42 WS (difenoconazole, thiamethoxam, and metalaxyl-m), Apron® XL (mefenoxam), Celest® XL (fludioxonil, mefenoxam) and thiram in the laboratory. In the greenhouse, the efficacy of fungicide treatment was evaluated in soil inoculated with Fusarium graminearum. The control consisted of untreated seeds. Germination and vigour were evaluated according to the International Seed Testing Association (1ST A) rules. The results from the standard gennination tests showed that all the fungicide treated seeds did not differ to the untreated control. The conductivity of solute leakage was read following slow and fast imbibition. Maize seeds treated with Apron® Star 42 WS, Celest® XL, Apron® XL and thiram improved or maintain vigour, which was indicated by a reduced or equivalent solute leakage following fast imbibition when compared with the untreated control. The good performance of fungicide treated seed expressed during conductivity test after fast imbibition correlated with the tetrazolium. All the fungicide treated seeds maintained the same viability as the untreated control following fast imbibition. After 6 h after fast imbibition, Apron® Star 42 WS, Celest® XL and Apron® XL treated seeds maintained similar germination percentages when compared to the untreated control with the exception of thiram treated seeds that exhibited a decline in seed viability. There was reduction in vigour in all the fungicide treated seeds fo llowing 24 and 40 h fast imbibition as illustrated by the reduction in germination percentage below the acceptable level (70%) when compared with the untreated control. The greenhouse study showed that all the fungicide treated seeds maintained the same emergence percentage in both inoculated and uninoculated soil with the exception of thiram treated seeds, where emergence improved in inoculated soil when compared to the untreated control. Apron® Star 42 WS and Celest® XL reduced the disease caused by F. graminearum in the inoculated soil. This study also revealed that the application of Apron® Star 42 WS, Celest® XL and thiram to seeds improved both the shoot and root dry mass of plants in the inoculated soil.
Dissertation (MInstAgrar)--University of Pretoria, 2011.
Microbiology and Plant Pathology
unrestricted

Style APA, Harvard, Vancouver, ISO itp.

Battistini, Elena <1979&gt. "Genetic variability and seed vigour in a sunflower germplasm collection". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3975/1/Battistini_Elena_tesi.pdf.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Siddique, Abu Bakar. "Effects of seed production environment and post harvest management on seed production, viability and vigour of seeds of pea and flax". Thesis, Bangor University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369444.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

SINGH, RAJ KUMAR. "Morphological, chemical and molecular characterization and seed vigour studies in coriander (Coriandrum sativum L.)". Dissertation/Thesis, Not Available, 2011. http://krishi.icar.gov.in/jspui/handle/123456789/8496.

Pełny tekst źródła

Streszczenie:

Not Available
The present investigation comprised of 20 varieties of coriander (Coriandrum sativum L.) was undertaken to characterize the varieties based on morphological and molecular markers including protein, isozymes and random amplified polymorphic DNA (RAPD) markers. All the varieties were also studied to know the vigour potential and also to find out suitable predictor for seedling establishment. The study revealed that morphological characters like days to 50% flowering, plant height, plant appearance, days to maturity, number of umbels per plant, number of umbellets per umbel, number of seeds per umbel and seed yield per plant were found important diagnostic characters for categorizing these varieties. Seed characters such as seed size, seed shape and test weight clearly differentiated the varieties into different groups. Total soluble seed protein analysis using SDS-PAGE revealed that varieties namely Sadhna, Sindhu, RCr-436 and RCr-684 gave different banding patter from rest of the varieties showing dissimilarity from them. Similarly, superoxide dismutase isozymes analysis using native PAGE revealed that varieties like CS-6, Sindhu and Swathi gave different banding pattern from rest of the varieties and showed dissimilarity from other varieties. However, peroxidase isozyme analysis showed lack of polymorphism in bands and hence, it could not differentiate the coriander varieties. Twenty RAPD primers were used to assess molecular polymorphism in the coriander varieties. A total of 90 bands were obtained from twenty random primers and out of that 73 bands were polymorphic while 17 bands were monomorphic resulting in 81.1 per cent polymorphism among the varieties. The majority of bands were polymorphic (73 bands, 81.1%) and only 17 bands (18.9%) were monomorphic. Out of twenty primers, four primers gave 100 per cent polymorphism. A few primers produced specific allele/DNA band which distinguished the variety from rest of the varieties. Results showed that RAPD bands were more effective and clearly differentiated varieties from each other but no primer gave polymorphism with all the varieties simultaneously. Maximum vigour potential was shown by GC-2, CS-6, H. Anand, H. Surbhi, RCr-435, RCr-436 and RCr-480 varieties, which showed superiority for almost all vigour parameters. Standard germination, tetrazolium test, and Accelerated ageing test were found the most suitable predictors for seedling establishment in coriander.
ICAR-NRCS ON SEED SPICES, AJMER (RAJASTHAN)

Style APA, Harvard, Vancouver, ISO itp.

Rai, Anu Sheela. "An Investigation into the problems of maintenance of seed vigour and viability under adverse climate conditions of Darjeeling Hills". Thesis, University of North Bengal, 1999. http://hdl.handle.net/123456789/890.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Saeidi, Ghodratollah. "The effect of seed colour and linolenic acid concentration on germination, seed vigour, seed quality and agronomic characteristics of flax". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27429.pdf.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Redfearn, Melanie. "Nucleic acid integrity and synthesis in relation to seed vigour in sugar beet". Thesis, Open University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321321.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Tamang, Deepa. "Enhancement of seed vigour and viability of aromatic rice by using chemicals under climatic conditions of Darjeeling Hills". Thesis, University of North Bengal, 2022. http://ir.nbu.ac.in/handle/123456789/4810.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Więcej źródeł

Książki na temat "SEED VIGOUR"

Tohidloo, Ghasem. Development, verification and validation of an image analysis system for seed vigour assessment in winter oilseed rape (WOSR-Vig). 2008.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Leith, Phillip Edward Meric. Growth of Timothy (phleum Pratense L. ) Seed from Pollination to Maturity and Effect of Degree of Maturity at Harvesting and of Chilling upon Germination and Seedling Vigour. Creative Media Partners, LLC, 2021.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Currans, Sean. Osmotic stress vigor test for wheat seed. 1988.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Kamaha, Claude. Seed vigor and emergence of six winter wheat cultivars. 1986.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Ndungu, Julia Njeri. Effects of mechanical injury inflicted during harvest and post-harvest operations on onion (Allium Cepa L.) seed viability and vigor. 1991.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Walls, Timothy W. The effects of soaking and low temperatures on germination and seedling vigor of snap beans (Phaseolus vulgaris L. cv. Slenderette). 1985.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Amery, Fran. Beyond Pro-life and Pro-choice. Policy Press, 2020. http://dx.doi.org/10.1332/policypress/9781529204995.001.0001.

Pełny tekst źródła

Streszczenie:

A common misunderstanding of the Abortion Act 1967 is that it granted women the ‘right’ to access abortion. In reality, there is no such thing; the current provision of abortion in the United Kingdom rests on a system in which doctors, not women, are the arbiters of abortion access. In recent years, calls for the full decriminalisation of abortion have been given a vigour not seen before. For the first time, MPs and medical associations have moved to back decriminalisation, in line with the demands of pro-choice campaigners across the UK. But at the same time, opponents are mobilising to undermine public faith in both the Abortion Act and abortion providers. In doing so, they have tended to set aside the classic ‘right to life’ arguments, instead focusing on issues such as sex-selective abortion and disability rights. This book makes sense of today’s changed landscape of abortion debate by tracing the evolution of political and parliamentary discourse on abortion from the passage of the Abortion Act in the 1960s to the present. It makes the case that to understand contemporary abortion politics, it is necessary to move beyond a conceptualisation of the debate as characterised by ‘pro-choice’ versus ‘pro-life’.

Style APA, Harvard, Vancouver, ISO itp.

Bullivant, Stephen. Mass Exodus. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198837947.001.0001.

Pełny tekst źródła

Streszczenie:

In 1962, Pope John XXIII opened the Second Vatican Council with the prophecy that ‘a new day is dawning on the Church, bathing her in radiant splendour’. Desiring ‘to impart an ever increasing vigour to the Christian life of the faithful’, the Council Fathers devoted particular attention to the laity, and set in motion a series of sweeping reforms. The most significant of these centred on refashioning the Church’s liturgy. Over fifty years on, however, the statistics speak for themselves—or seem to. In America, only 15% of cradle Catholics say that they attend Mass on a weekly basis; meanwhile, 35% no longer even tick the ‘Catholic box’ on surveys. In Britain, of those raised Catholic, just 13% still attend Mass weekly, and 37% say they have ‘no religion’. But is this all the fault of Vatican II, and its runaway reforms? Or are wider social, cultural, and moral forces primarily to blame? Catholicism is not the only Christian group to have suffered serious declines since the 1960s. If anything Catholics exhibit higher church attendance, and better retention, than most Protestant churches do. If Vatican II is not the cause of Catholicism’s crisis, might it instead be the secret to its (comparative) success? Mass Exodus is the first serious historical and sociological study of Catholic lapsation and disaffiliation. Drawing on a wide range of theological, historical, and sociological sources, it also offers a comparative study of secularization across two famously contrasting religious cultures: Britain and the USA.

Style APA, Harvard, Vancouver, ISO itp.

Meeker, Natania, i Antónia Szabari. Radical Botany. Fordham University Press, 2019. http://dx.doi.org/10.5422/fordham/9780823286638.001.0001.

Pełny tekst źródła

Streszczenie:

Radical Botany uncovers a long speculative tradition of plant fiction that conjures up new languages to grasp the life of plants—their vegetality—in all its specificity and vigor. The first part of the book reaches back to seventeenth-century materialisms to show how plants, rather than being systematically excluded from human deliberation, have in fact participated in modernity. The French authors with whom the work begins turn to plants to think through the problems and paradoxes that face all forms of life considered first as matter. Within this framework, plants are ascribed an agency and vitality that might otherwise seem foreign to them, but they are also envisioned as beings that resist incorporation into human contexts and thus have something to teach humans about their limitations and vulnerabilities. Classically, the botanical sciences that develop over the course of the long eighteenth century function as a project for ordering, visualizing, labeling, and classifying life. In Radical Botany, the authors unearth an alternative set of engagements with the plant as a life form—a tradition that conceives of vegetal life as resisting representability even as it participates in the production of new representational modes—including the novel, early cinema, and contemporary virtual reality—and new affects—including queer desires, feminist affinities, and ecological solidarities. The radical botanical works this book explores not only prioritize plants as active participants in “their” world but suggest that the apparent passivity of plants can function as a powerful destabilizing force in its own right.

Style APA, Harvard, Vancouver, ISO itp.

Części książek na temat "SEED VIGOUR"

Basu, Sudipta, i Steven P. C. Groot. "Seed Vigour and Invigoration". W Seed Science and Technology, 67–89. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5888-5_4.

Pełny tekst źródła

Streszczenie:

AbstractSeed vigour is an important aspect of seed quality. It is a quantitative trait which is responsible for overall seed performance in terms of rate and uniformity of seed germination, seedling growth, emergence ability under unfavourable environments and post storage performance. Seed vigour is controlled by genetic factors, initial seed quality, production environments, harvesting and storage conditions. Seed vigour tests provide a more sensitive index of seed performance per se than the germination test. Efforts have been focused on developing novel or improving existing methods of vigour estimation in different crops. The vigour tests are tools routinely used for in-house seed quality control programs, especially for field and vegetable crops. Some treatments can improve seed vigour, although the treatment effects are more evident under sub-optimum than optimum growing conditions. This chapter deals with different aspects of seed vigour and its effects on plant growth and discusses physiological and biochemical parameters to understand underlying mechanisms.

Style APA, Harvard, Vancouver, ISO itp.

Bradbeer, J. W. "Seed Viability and Vigour". W Seed Dormancy and Germination, 95–109. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-7747-4_8.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Bradbeer, J. W. "Seed Viability and Vigour". W Seed Dormancy and Germination, 95–109. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-011-6574-7_8.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Roberts, E. H., i K. Osei-Bonsu. "Seed and seedling vigour". W World crops: Cool season food legumes, 897–910. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2764-3_71.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Sripathy, K. V., i Steven P. C. Groot. "Seed Development and Maturation". W Seed Science and Technology, 17–38. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5888-5_2.

Pełny tekst źródła

Streszczenie:

AbstractIn plants, a fascinating set of post-fertilization events result in the development of a dispersal unit known as a seed. During the maturation phase, seeds accumulate storage reserves and acquire desiccation tolerance, followed by an increase in seed vigour during maturation drying. Physiological (or mass) maturity may be attributed to the stage of seed maturation when maximum seed dry matter accumulation has occurred, marking the end of the seed-filling phase. The stage of maturity at harvest is one of the most important factors that can influence the quality of seeds. Recent studies established that seed vigour and longevity continue to increase even after physiological maturity, signifying the importance of the late maturation phase for maximizing seed quality. Among the plant hormones, abscisic acid (ABA) has been studied extensively for its role during seed development and maturation. Apart from ABA, gibberellic acid (GA), cytokinin and auxin also play a critical role during the development of seeds. Desiccation tolerance in seeds begins much before the attainment of physiological maturity. Acquisition of desiccation tolerance is associated with embryo accumulation of oligosaccharides of the raffinose family, low molecular weight antioxidants, late embryogenesis abundant proteins and heat shock proteins coupled with structural changes at the cellular level. To obtain seeds of maximum quality (in terms of germination, vigour and longevity), harvesting needs to be performed at or slightly after harvest maturity a period at which seed moisture content stabilizes with environmental factors. In this chapter, an attempt has been made to present the current understanding of seed development and maturation concentrating on various aspects viz. phases of seed development, the role of plant hormones, other factors affecting seed development, concepts of seed maturity, and its relevance to seed quality, maturity indices in crop plants and acquisition of desiccation tolerance in seeds.

Style APA, Harvard, Vancouver, ISO itp.

Tekrony, D. M., i D. B. Egli. "Accumulation of Seed Vigour During Development and Maturation". W Basic and Applied Aspects of Seed Biology, 369–84. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5716-2_41.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Dadlani, Malavika, Anuja Gupta, S. N. Sinha i Raghavendra Kavali. "Seed Storage and Packaging". W Seed Science and Technology, 239–66. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5888-5_11.

Pełny tekst źródła

Streszczenie:

AbstractStorage is an essential component of seed programmes, which primarily aims at maintaining the high-quality standards of the seed from harvest till the time of sowing the crop in the next or successive seasons. In addition to this, seeds are also stored for longer durations to maintain stocks for seed trade at national and international levels as per market demands and as a buffer against crop failures in times of natural calamities or other exigencies, to maintain seeds of the parental lines for hybrid seed production in one or more seasons, to conserve active genetic stocks for breeding purposes, and to maintain germplasm for long term use. Seeds of most of the agriculturally important species are categorised as orthodox or desiccation-tolerant. Their longevity increases with decrease in storage temperature and the relative humidity of the storage environment (or seed moisture content). However, notwithstanding the constitutional differences among plant species concerning seed longevity, being a living entity, every seed undergoes deteriorative changes during storage, even in dry stores, primarily in terms of germination and vigour due to physiological deterioration, and changes brought by the presence of the pests and pathogens. A good seed programme aims at maintaining the high planting value of the seed in terms of purity, germination, vigour, and seed health during storage by taking care in seed handling, controlling the temperature and relative humidity of the store (or seed moisture in case of hermetically sealed containers), and following good sanitation practices. Considering that the facilities for conditioned storage may not be accessible and affordable in many situations, alternative solutions may be considered, especially for on-farm seed storage.

Style APA, Harvard, Vancouver, ISO itp.

Sliwinska, E. "Flow Cytometric Analysis of Sugar-Beet Seeds Different in Vigour". W Basic and Applied Aspects of Seed Biology, 577–84. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5716-2_64.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Chakrabarty, Shyamal K., Sudipta Basu i W. Schipprach. "Hybrid Seed Production Technology". W Seed Science and Technology, 173–212. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5888-5_9.

Pełny tekst źródła

Streszczenie:

AbstractHybrid technology, harnessing the advantage of heterosis between two diverse genotypes to achieve maximum hybrid vigour, is widely recognized and commercially used for crop variety improvement both in field and vegetable crops. Hybrids can be developed using appropriate technology, irrespective of the mating and pollination system in the plant species. Production of hybrid seed depends on plant, pollinator and environmental factors, which influence it individually or in interactive ways. Hence, an understanding of these components is important to undertake hybrid seed production of a given crop species. The basic requirements for hybrid seed production at a commercial scale are (a) a unisexual flower or a bisexual flower with sterile pollen in anther or self-incompatible flower/plant; or pistillateness; or large conspicuous bisexual flowers for easy emasculation of flowers in plants to be used as the female parent and (b) abundant pollen production, dispersal and its easy transfer from the male parent to the female parent for satisfactory seed setting. These are dependent on floral biology, flower features, mode of pollination and reproduction of the crop species. Agronomic crop management with scientific insights is equally important for successful hybrid seed production. These are discussed in this chapter with appropriate examples.

Style APA, Harvard, Vancouver, ISO itp.

Redfearn, M., N. A. Clarke, D. J. Osborne, P. Halmer i T. H. Thomas. "DNA Integrity and Synthesis in Relation to Seed Vigour in Sugar Beet". W Basic and Applied Aspects of Seed Biology, 413–20. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5716-2_45.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Streszczenia konferencji na temat "SEED VIGOUR"

Abouelezz, Ahmed Helmy Hassan, i Talaat Ahmed. "The Efficacy of Two Household Cleaning and Disinfecting Agents on Lentil (Lens culinaris Medik) and Faba bean (Vicia faba) Seed Germination". W Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0023.

Pełny tekst źródła

Streszczenie:

A germination test of Vicia faba and Lens culinaris seeds under the effect of bleach and vinegar was conducted for seven days, and the observations were recorded daily. The completely randomized design (CRD) was used to examine the germination with three replicates at the lab conditions. Six germination parameters were measured, including germination percentage (GP), germination index (GI), mean germination time (MGT), mean germination rate (MGR), vigour index (VI), plus the fresh weight (FW) and dry weight (DW) of Vicia faba and Lens culinaris seeds. As a legume crop seeds model, the efficacy of four treatment levels from 0.005% to 0.5% of bleach and vinegar on the germination was tested. A chemical analysis was performed using the ion chromatography (IC) to evaluate the effect of chloride and acetate anions up-take on the seedling germination in addition to other essential nutrients. A significant inhibition in seedling growth was observed with increasing the treatment concentration. The maximum inhibition was recorded for both seeds at 0.5%, followed by 0.1% levels, while a positive effect was represented with the lower concentrations. The chemical analysis of the up-taking active ingredients was corroborated by the germination outputs.

Style APA, Harvard, Vancouver, ISO itp.

Lang, Zoltan, Sandor Molnar i Gizella Horvath. "Seed vigor test based on image processing". W Photonics East (ISAM, VVDC, IEMB), redaktorzy George E. Meyer i James A. DeShazer. SPIE, 1999. http://dx.doi.org/10.1117/12.336881.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Hartati, Puspa, Rosmayati Rosmayati i Diana Sofiah Hanafiah. "Viability and Vigour of Sesame (Sesamum indicum L) Seeds". W International Conference on Natural Resources and Technology. SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0008547401310134.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Zhao, Ying-Qi, Qian Shen, Sen Men, Jia-Xin Liu, Lei Yan i Jiang Xiao. "EVALUATION OF SEED VIGOR THROUGH BIOSPECKLE USING IM METHOD". W 2015 International Conference on Material Engineering and Mechanical Engineering (MEME2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789814759687_0130.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

"Germination Vigour versus Delayed Luminescence of Coffee Seeds - Preliminary Series". W International Conference on Photonics, Optics and Laser Technology. SCITEPRESS - Science and and Technology Publications, 2014. http://dx.doi.org/10.5220/0004677401470151.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Dongli Liu i Fang Cheng. "Nondestructive prediction of vigour of maize seeds by Raman spectroscopy". W 2011 Louisville, Kentucky, August 7 - August 10, 2011. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2011. http://dx.doi.org/10.13031/2013.37780.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Huaxian Zhang, Fang Cheng, Huaxian Zhang i Fang Cheng. "Determination of Rice Seed Vigor Using Digital Image Processing Technology". W 2007 Minneapolis, Minnesota, June 17-20, 2007. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2007. http://dx.doi.org/10.13031/2013.23184.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Zhao, Xueguan, Yuanyuan Gao, Xiu Wang, Cuiling Li, Songlin Wang i Qinghun Feng. "Research on tomato seed vigor based on X-ray digital image". W SPIE/COS Photonics Asia, redaktorzy Qionghai Dai i Tsutomu Shimura. SPIE, 2016. http://dx.doi.org/10.1117/12.2246145.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Silva Junior, J. F., A. E. Klar, A. A. Tanaka, I. P. F. Silva i A. I. I. Cardoso. "Tomatoes Seeds Vigor under Water or Salt Stress". W II Inovagri International Meeting. Fortaleza, Ceará, Brasil: INOVAGRI/INCT-EI/INCTSal, 2014. http://dx.doi.org/10.12702/ii.inovagri.2014-a734.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Santanna, Marcus G. F., Priscila T. M. Saito i Pedro H. Bugatti. "Content-based image retrieval towards the automatic characterization of soybean seed vigor". W SAC 2014: Symposium on Applied Computing. New York, NY, USA: ACM, 2014. http://dx.doi.org/10.1145/2554850.2555007.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Raporty organizacyjne na temat "SEED VIGOUR"

Bradford, Kent, Haim Nerson, Gregory Wellbaum i Menahem Edelstein. Environmental, Developmental and Physiological Determinants of Curcurbit Seed Quality. United States Department of Agriculture, październik 1998. http://dx.doi.org/10.32747/1998.7695837.bard.

Pełny tekst źródła

Streszczenie:

Environmental, developmental, physiological and biochemical determinants of cucurbit seed quality were investigated in field and laboratory experiments. The major factor influencing seed quality is seed maturity at harvest, with both immature and overmature seeds exhibiting reduced quality. Planting density and fruit load per plant can be manipulated to maximize seed yield per unit area without adversely affecting seed quality. Seeds harvested at optimal maturity will have the greatest germination vigor and will maintain quality longer during storage. Seed priming can improve germination rates and uniformity, but can reduce storage life. Tissues enclosing the embryo (the endosperm envelope and seed coat) are involved in regulating germination. The seed coat (testa) may restrict oxygen diffusion to the embryo in some muskmelon genotypes. Weakening of the endosperm envelope is associated with radicle emergence. Callose deposition in the endosperm envelope results in semipermeability. Defense proteins such as chitinase are also present in the endosperm. Numerous genes were identified that are expressed specifically in association with germination, but their functions are yet to be elucidated. These studies have provided guidelines for producing and harvesting cucurbit seeds for maximum yield and quality and have identified physiological and biochemical processes contributing to seed germination vigor.

Style APA, Harvard, Vancouver, ISO itp.

Rodriguez, Carlos, i Alison E. Robertson. Benefits of Fungicide Seed Treatment on Corn Establishment, Vigor, and Yield. Ames: Iowa State University, Digital Repository, 2008. http://dx.doi.org/10.31274/farmprogressreports-180814-2576.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Rodriguez, Carlos. Benefits of Fungicide Seed Treatment on Corn Establishment, Vigor, and Yield. Ames: Iowa State University, Digital Repository, 2008. http://dx.doi.org/10.31274/farmprogressreports-180814-756.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Ostersetzer-Biran, Oren, i Jeffrey Mower. Novel strategies to induce male sterility and restore fertility in Brassicaceae crops. United States Department of Agriculture, styczeń 2016. http://dx.doi.org/10.32747/2016.7604267.bard.

Pełny tekst źródła

Streszczenie:

Abstract Mitochondria are the site of respiration and numerous other metabolic processes required for plant growth and development. Increased demands for metabolic energy are observed during different stages in the plants life cycle, but are particularly ample during germination and reproductive organ development. These activities are dependent upon the tight regulation of the expression and accumulation of various organellar proteins. Plant mitochondria contain their own genomes (mtDNA), which encode for rRNAs, tRNAs and some mitochondrial proteins. Although all mitochondria have probably evolved from a common alpha-proteobacterial ancestor, notable genomic reorganizations have occurred in the mtDNAs of different eukaryotic lineages. Plant mtDNAs are notably larger and more variable in size (ranging from 70~11,000 kbp in size) than the mrDNAs in higher animals (16~19 kbp). Another unique feature of plant mitochondria includes the presence of both circular and linear DNA fragments, which undergo intra- and intermolecular recombination. DNA-seq data indicate that such recombination events result with diverged mitochondrial genome configurations, even within a single plant species. One common plant phenotype that emerges as a consequence of altered mtDNA configuration is cytoplasmic male sterility CMS (i.e. reduced production of functional pollen). The maternally-inherited male sterility phenotype is highly valuable agriculturally. CMS forces the production of F1 hybrids, particularly in predominantly self-pollinating crops, resulting in enhanced crop growth and productivity through heterosis (i.e. hybrid vigor or outbreeding enhancement). CMS lines have been implemented in some cereal and vegetables, but most crops still lack a CMS system. This work focuses on the analysis of the molecular basis of CMS. We also aim to induce nuclear or organellar induced male-sterility in plants, and to develop a novel approach for fertility restoration. Our work focuses on Brassicaceae, a large family of flowering plants that includes Arabidopsis thaliana, a key model organism in plant sciences, as well as many crops of major economic importance (e.g., broccoli, cauliflower, cabbage, and various seeds for oil production). In spite of the genomic rearrangements in the mtDNAs of plants, the number of genes and the coding sequences are conserved among different mtDNAs in angiosperms (i.e. ~60 genes encoding different tRNAs, rRNAs, ribosomal proteins and subunits of the respiratory system). Yet, in addition to the known genes, plant mtDNAs also harbor numerous ORFs, most of which are not conserved among species and are currently of unknown function. Remarkably, and relevant to our study, CMS in plants is primarily associated with the expression of novel chimericORFs, which likely derive from recombination events within the mtDNAs. Whereas the CMS loci are localized to the mtDNAs, the factors that restore fertility (Rfs) are identified as nuclear-encoded RNA-binding proteins. Interestingly, nearly all of the Rf’s are identified as pentatricopeptide repeat (PPR) proteins, a large family of modular RNA-binding proteins that mediate several aspects of gene expression primarily in plant organelles. In this project we proposed to develop a system to test the ability of mtORFs in plants, which are closely related to known CMS factors. We will induce male fertility in various species of Brassicaceae, and test whether a down-relation in the expression of the recombinantCMS-genes restores fertility, using synthetically designed PPR proteins.

Style APA, Harvard, Vancouver, ISO itp.

Guy, Charles, Gozal Ben-Hayyim, Gloria Moore, Doron Holland i Yuval Eshdat. Common Mechanisms of Response to the Stresses of High Salinity and Low Temperature and Genetic Mapping of Stress Tolerance Loci in Citrus. United States Department of Agriculture, maj 1995. http://dx.doi.org/10.32747/1995.7613013.bard.

Pełny tekst źródła

Streszczenie:

The objectives that were outlined in our original proposal have largely been achieved or will be so by the end of the project in February 1995 with one exception; that of mapping cold tolerance loci based on the segregation of tolerance in the BC1 progeny population. Briefly, our goals were to 1) construct a densely populated linkage map of the citrus genome: 2) map loci important in cold and/or salt stress tolerance; and 3) characterize the expression of genes responsive to cold land salt stress. As can be seen by the preceding listing of accomplishments, our original objectives A and B have been realized, objective C has been partially tested, objective D has been completed, and work on objectives E and F will be completed by the end of 1995. Although we have yet to map any loci that contribute to an ability of citrus to maintain growth when irrigated with saline water, our very encouraging results from the 1993 experiment provides us with considerable hope that 1994's much more comprehensive and better controlled experiment will yield the desired results once the data has been fully analyzed. Part of our optimism derives from the findings that loci for growth are closely linked with loci associated with foliar Cl- and Na+ accumulation patterns under non-salinization conditions. In the 1994 experiment, if ion exclusion or sequestration traits are segregating in the population, the experimental design will permit their resolution. Our fortunes with respect to cold tolerance is another situation. In three attempts to quantitatively characterize cold tolerance as an LT50, the results have been too variable and the incremental differences between sensitive and tolerant too small to use for mapping. To adequately determine the LT50 requires many plants, many more than we have been able to generate in the time and space available by making cuttings from small greenhouse-grown stock plants. As it has turned out, with citrus, to prepare enough plants needed to be successful in this objective would have required extensive facilities for both growing and testing hardiness which simply were not available at University of Florida. The large populations necessary to overcome the variability we encountered was unanticipated and unforeseeable at the project's outset. In spite of the setbacks, this project, when it is finally complete will be exceedingly successful. Listing of Accomplishments During the funded interval we have accomplished the following objectives: Developed a reasonably high density linkage map for citrus - mapped the loci for two cold responsive genes that were cloned from Poncirus - mapped the loci for csa, the salt responsive gene for glutathione peroxidase, and ccr a circadian rhythm gene from citrus - identified loci that confer parental derived specific DNA methylation patterns in the Citrus X Poncirus cross - mapped 5 loci that determine shoot vigor - mapped 2 loci that influence leaf Na+ accumulation patterns under non-saline conditions in the BC1 population - mapped 3 loci that influence leaf Na+ accumulation paterns during salt sress - mapped 2 loci that control leaf Cl- accumulation patterns under non-saline conditions - mapped a locus that controls leaf Cl- accumulation patterns during salt stress Screened the BC1 population for growth reduction during salinization (controls and salinized), and cold tolerance - determined population variation for shoot/root ratio of Na+ and Cl- - determined levels for 12 inorganic nutrient elements in an effort to examine the influence of salinization on ion content with emphasis on foliar responses - collected data on ion distribution to reveal patterns of exclusion/sequestration/ accumulation - analyzed relationships between ion content and growth Characterization of gene expression in response to salt or cold stress - cloned the gene for the salt responsive protein csa, identified it as glutathione peroxidase, determined the potential target substrate from enzymatic studies - cloned two other genes responsive to salt stress, one for the citrus homologue of a Lea5, and the other for an "oleosin" like gene - cold regulated (cor) genes belonging to five hybridization classes were isolated from Poncirus, two belonged to the group 2 Lea superfamily of stress proteins, the others show no significant homology to other known sequences - the expression of csa during cold acclimation was examined, and the expression of some of the cor genes were examined in response to salt stress - the influence of salinization on cold tolerance has been examined with seedling populations - conducted protein blot studies for expression of cold stress proteins during salt stress and vice versa

Style APA, Harvard, Vancouver, ISO itp.

Oferujemy zniżki na wszystkie plany premium dla autorów, których prace zostały uwzględnione w tematycznych zestawieniach literatury. Skontaktuj się z nami, aby uzyskać unikalny kod promocyjny!