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Letteratura scientifica selezionata sul tema "Seed germination"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 18 maggio 2024

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Articoli di riviste sul tema "Seed germination"

Pee, K. C., C. E. Johnson, E. W. Bush e E. A. Drummond. "SUB-OPTIMUM TEMPERATURE GERMINATION OF 15 WATERMELON CULTIVARS". HortScience 25, n. 8 (agosto 1990): 862a—862. http://dx.doi.org/10.21273/hortsci.25.8.862a.

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Seed of 15 watermelon cultivars were evaluated for germinating ability at sub-optimum temperatures. Seeds of each cultivar were exposed to 12.8, 15.6, 18.3, 21.1, and 30.0°C for 8 days in a germinator in accordance to standard seed testing rules. Radical emergence was evaluated on day 5 and day 8. None of the cultivars germinated at 12.8C after 8 days exposure. At 15.6°C, 'Red-N-Sweet' and `Blackstone' had germinations of 54 and 40 percent respectively on day 5, and both increased to over 80 percent on day 8. At 18.3°C `Red-N-Sweet' and `Blackstone' exhibited at least 90 percent germination after 5 days while the other 14 cultivars ranged from 2.5 to 86 percent. At 21.1°C all cultivars except `Black Diamond' and `Allsweet' had germinations of 80 percent or higher on day 5. Germination increased to 90 percent or above by day 8 except for `Black Diamond' at 83 percent. There were no significant differences among cultivars at the 30°C optimum germinating temperature with cultivars having 89.5 percent or higher germination.

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Chiu, S. N., e M. P. Quine. "Central limit theorem for germination-growth models in ℝd with non-Poisson locations". Advances in Applied Probability 33, n. 4 (dicembre 2001): 751–55. http://dx.doi.org/10.1239/aap/1011994026.

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Seeds are randomly scattered in ℝd according to an m-dependent point process. Each seed has its own potential germination time. From each seed that succeeds in germinating, a spherical inhibited region grows to prohibit germination of any seed with later potential germination time. We show that under certain conditions on the distribution of the potential germination time, the number of germinated seeds in a large region has an asymptotic normal distribution.

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Chiu, S. N., e M. P. Quine. "Central limit theorem for germination-growth models in ℝd with non-Poisson locations". Advances in Applied Probability 33, n. 04 (dicembre 2001): 751–55. http://dx.doi.org/10.1017/s0001867800011162.

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Seeds are randomly scattered in ℝ d according to an m-dependent point process. Each seed has its own potential germination time. From each seed that succeeds in germinating, a spherical inhibited region grows to prohibit germination of any seed with later potential germination time. We show that under certain conditions on the distribution of the potential germination time, the number of germinated seeds in a large region has an asymptotic normal distribution.

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Liu, Mengzhou, Ning Qiao, Bing Zhang, Fengying Liu, Yuan Miao, Ji Chen, Yanfeng Sun, Peng Wang e Dong Wang. "Differential responses of the seed germination of three functional groups to low temperature and darkness in a typical steppe, Northern China". PeerJ 10 (1 dicembre 2022): e14485. http://dx.doi.org/10.7717/peerj.14485.

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Seed germination is a key stage in the life history of plants, which has a crucial effect on plant community structure. Climate change has substantially altered the surface soil temperature and light availability, which can affect seed germination. However, whether the seed germination of different functional groups is affected by the interactions of light and temperature remains unclear. Under laboratory conditions, we examined the effects of low temperature and darkness, as well as their interaction, on the seed germination of 16 species belonging to three plant functional groups (annual and biennials, perennial grasses, and perennial forbs) in a typical steppe, Northern China. We found that low temperature had a significant negative effect on seed germination of all species. Low temperature significantly decreased the final germination percentage and germinative force of the three plant functional groups, and the germination duration of perennial grasses. Darkness significantly decreased the germinative force of perennial forbs and total seeds, and the germination duration of perennial grasses. The interactive effects of light and temperature on the seed final germination percentage and germinative force of perennial grass indicated that darkness strengthened the inhibitory effect of low temperature on the seed germination of the grass functional group. Our study indicate that the seed germination of different plant functional groups varied greatly in response to changing environmental conditions. Our results suggest that future climate change could alter the regeneration and species composition of plant communities through changing seed germination.

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M. Olivas, Regine. "SEED GERMINATION OF TOMATO (SOLANUM LYCOPERSICUM) USING PAPAYA (CARICA PAPAYA L.) FRUIT EXTRACTS AS NATURALLY OCCURRING GERMINATION INHIBITOR AND GIBBERELLIC ACID IN VARIOUS SEED TREATMENTS". International Journal of Advanced Research 9, n. 11 (30 novembre 2021): 923–26. http://dx.doi.org/10.21474/ijar01/13822.

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Seed Germination is a vital process in plant growth and development. It is very crucial in crop production. Control of seed germination can proceed if there are presence of naturally occurring germination inhibitors such as papaya fruit extracts. Promotion of seed germination on the other hand, can be obtain from plant growth hormones such as gibberellic acid. Various seed treatments used in the experiment were the following: T1-unwashed, fresh T2-washed, fresh T3-washed, air-dried T4-washed, fresh and T5-washed, fresh.Twenty (20) seeds were counted for each treatment. Distilled water as the germinating medium for the seeds were T1, T2 and T3. In T4 and T5, 100ppm of GA3 and papaya fruit extracts were used as germinating media respectively. The highest and the lowest percent germination was shown in T2 and T5 respectively.InT1 and T3 on the other hand, had 75% and 80% germination respectively.Papaya fruit extracts (T5) is considered as a naturally occurring germination inhibitorin tomato.

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Wartidiningsih, N., e Robert L. Geneve. "IMPROVEMENT IN SEED GERMINATION IN PURPLE CONEFLOWER (ECHINACEA PURPUREA) AFTER COLD STRATIFICATION OR OSMOTIC PRIMING." HortScience 25, n. 9 (settembre 1990): 1088c—1088. http://dx.doi.org/10.21273/hortsci.25.9.1088c.

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Germination was evaluated in six seed lots of purple coneflower purchased from four different seed companies. Standard germination percent ranged from 28% to 90% depending on the seed lot. For seed collected in 1989, seed size and stage of development of the seed at harvest could not account for the wide variability in seed germination observed in the purchased seed lots. preconditioning the seed with either cold stratification (10°C for 10 days) or osmotic priming (PEG or salt solution at -5 bars for 5 days) increased the rate of germination and the overall percent germination for all seed lots and dramatically improved germination in the poor germinating seed lots. Preconditioning appears to overcome either a shallow physiological dormancy or compensates for seeds with poor vigor or quality. In either case, seed preconditioning drastically improved seed germination (rate and percent) in greenhouse and field tests for purple coneflower.

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Zhang, Heng, Guang Chen, Heng Xu, Sasa Jing, Yingying Jiang, Ziwen Liu, Hua Zhang, Fulin Wang, Xiangyang Hu e Ying Zhu. "Transcriptome Analysis of Rice Embryo and Endosperm during Seed Germination". International Journal of Molecular Sciences 24, n. 10 (13 maggio 2023): 8710. http://dx.doi.org/10.3390/ijms24108710.

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Seed germination is a complex, multistage developmental process that is an important step in plant development. In this study, RNA-Seq was conducted in the embryo and endosperm of unshelled germinating rice seeds. A total of 14,391 differentially expressed genes (DEGs) were identified between the dry seeds and the germinating seeds. Of these DEGs, 7109 were identified in both the embryo and endosperm, 3953 were embryo specific, and 3329 were endosperm specific. The embryo-specific DEGs were enriched in the plant-hormone signal-transduction pathway, while the endosperm-specific DEGs were enriched in phenylalanine, tyrosine, and tryptophan biosynthesis. We categorized these DEGs into early-, intermediate-, and late-stage genes, as well as consistently responsive genes, which can be enriched in various pathways related to seed germination. Transcription-factor (TF) analysis showed that 643 TFs from 48 families were differentially expressed during seed germination. Moreover, 12 unfolded protein response (UPR) pathway genes were induced by seed germination, and the knockout of OsBiP2 resulted in reduced germination rates compared to the wild type. This study enhances our understanding of gene responses in the embryo and endosperm during seed germination and provides insight into the effects of UPR on seed germination in rice.

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Faúndez, Ángela, Carlos R. Magni, Eduardo Martínez-Herrera, Sergio Espinoza, Suraj Vaswani, Marco A. Yañez, Iván Gréz, Oscar Seguel, Betsabé Abarca-Rojas e Iván Quiroz. "Effect of the Soil Matric Potential on the Germination Capacity of Prosopis chilensis, Quillaja saponaria and Cryptocarya alba from Contrasting Geographical Origins". Plants 11, n. 21 (2 novembre 2022): 2963. http://dx.doi.org/10.3390/plants11212963.

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As a consequence of the megadrought in Central Chile, it is expected that most of the distribution of woody species will be narrowed in the northern limits because of restrictions imposed by soil matric potential on seed germination. In this study, we analyzed the effect of the soil matric potential on seed germination and initial recruitment of the sclerophyllous species Prosopis chilensis, Quillaja saponaria and Cryptocarya alba from contrasting geographic origins (i.e., seed sources). We evaluated the germination capacity (%) under different matric potentials (i.e., 0, −6, −33, −750 and −1250 kPa) for 100 days. Soil matric potential of −1250 kPa negatively affected the germination capacity of the three species. P. chilensis seeds stopped germinating under soil matric potential close to −1200 kPa, whereas in Q. saponaria and C. alba the complete inhibition of germination was under −1000 kPa. Seed sources also differed in their germination capacity by soil matric potential: northern seed sources of P. chilensis germinated with the lowest soil matric potential. There was no clear trend in Q. saponaria and C. alba, but in general, southern seed sources performed better than the northern ones. The results showed that Ѱm in the soil played an important role in the germinative capacity against different seed source origins, but not in soils with a north–south gradient.

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Ling-Yun, Wu, Yan Jun, Huang Zhi-wu, Wan Yan-Hui e Zhu Wei-Min. "Solid matrix priming improves cauliflower and broccoli seed germination and early growth under the suboptimal temperature conditions". PLOS ONE 17, n. 10 (3 ottobre 2022): e0275073. http://dx.doi.org/10.1371/journal.pone.0275073.

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Seed priming is an effective method for imparting stress tolerance to plants. This study aimed to analyze the effects of solid matrix priming (SMP) on cauliflower and broccoli seed germination and early seedling growth under suboptimal temperature conditions. The SMP method used in this study included the following steps: (1) mixing seeds with vermiculite and water at a ratio of 2:3:2.5 (w/w/v) and incubating for 2 days in the dark at 20°C; (2) drying the SM-primed seed; (3) germinating the SM-primed and the nonprimed seeds at 10, 15, 20, and 25°C; (4) analyzing the antioxidant enzyme activities of SM-primed and nonprimed germinating broccoli and cauliflower seeds in the early germination stage at 10, 15, 20, and 25°C; and (5) testing the emergence of SM-primed and nonprimed control seeds in the early spring glasshouse. The results showed that the SMP improved seed germination vigor and early seedling growth and increased the activities of peroxidase and ascorbate peroxidase in the germinating cauliflower and broccoli seeds under the suboptimal temperature conditions in the early germination stage compared with nonprimed seeds. It was observed that the suboptimal temperature conditions (i.e., 10 and 15°C) suppressed SM-primed and nonprimed seed germination and early seedling growth of cauliflower and broccoli. Inside a greenhouse, the SMP improved the emergence of cauliflower and broccoli seeds during the early spring season. SMP is an effective method for improving seed germination and the emergence of cauliflower and broccoli under suboptimal temperature conditions.

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Foolad, Majid R., Prakash Subbiah e Liping Zhang. "Common QTL Affect the Rate of Tomato Seed Germination under Different Stress and Nonstress Conditions". International Journal of Plant Genomics 2007 (10 febbraio 2007): 1–10. http://dx.doi.org/10.1155/2007/97386.

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The purpose of this study was to determine whether the rates of tomato seed germination under different stress and nonstress conditions were under common genetic controls by examining quantitative trait loci (QTL) affecting such traits. Seeds of BC1 progeny of a cross between a slow-germinating tomato breeding line and a rapid-germinating tomato wild accession were evaluated for germination under nonstress as well as cold, salt, and drought stress conditions. In each treatment, the most rapidly-germinating seeds were selected, grown to maturity, and subjected to molecular marker analysis. A selective genotyping approach detected between 6 and 9 QTL affecting germination rate under each of the four conditions, with a total of 14 QTL identified. Ten QTL affected germination rate under 2 or 3 conditions, which were considered germination-related common QTL. Four QTL affected germination rate only in one treatment, which were considered germination-related, condition-specific QTL . The results indicated that mostly the same QTL affected seed germination under different stress and nonstress conditions, supporting a previous suggestion that similar physiological mechanisms contribute to rapid seed germination under different conditions. Marker-assisted selection for the common QTL may result in progeny with rapid seed germinability under different conditions.

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Più fonti

Tesi sul tema "Seed germination"

Hampstead, Anthony. "Mathematical approaches to seed germination". Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/13979/.

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Plant seeds progress through specific stages during germination, from quiescence in the dry state through water uptake, testa rupture and finally endosperm rupture. The stages of seed germination are fairly well classified but the underlying biochemical and mechanical processes are unknown. The ability to control a seeds progression through the stages of germination has implications on farming efficiency and so the following thesis explores Arabidopsis thaliana and Lepidium sativum seeds during the germination process. A systematic approach to analysing the shape of cells within the radicle (embryonic root tissue) is developed, using confocal imaging, in order to characterise the shape of cells in the different tissues of the radicle. The cell shape approximations are not refined enough to characterise the different cell tissues. With more data, this approach would hope to find the region in which cells alter through the germination process. Change in the activity of cell wall modifying enzymes within the endosperm, that surrounds the emerging embryo, is a key part of the germination process and temporally and spatially defined high resolution transcriptomics data-sets are available to inform models. Through the course of this thesis, biochemical networks are developed, with ordinary and partial differential equation models being constructed and analysed. The models highlight elements for further investigation as well as differences between the two species considered. The mathematical models, along with data from biomechanical experiments on the endosperm, inform discussion on how the cell wall biochemistry of a cell wall alters the cell wall properties. These discussions focus on cell wall permeability, extensibility and the final cell separation event associated with germination. From the considered proteins, polygalacturonase and pectin lyase arise as the only viable candidates to cause the cell separation event with the model framework.

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Ma, Liuyin. "THE ROLE OF POLYADENYLATION IN SEED GERMINATION". UKnowledge, 2013. http://uknowledge.uky.edu/pss_etds/47.

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Seed germination has many impacts on the uses of seeds, and is an important subject for study. Seed germination is regulated at both transcriptional and post-transcriptional levels. Therefore, it is important to study how polyadenylation regulates gene expression during seed germination. To this end, a modified Illumina GAIIx sequencing protocol (described in Chapter Two) was developed that allows deep coverage of poly(A) site position and distribution. Alternative polyadenylation (APA) regulates gene expression by choosing one potential poly(A) site on a precursor RNA consequentially shortening/lengthening the mRNA relative to other possible sites. To further explore this phenomenon, genes affected by APA during seed germination and other developmental stages were identified (Chapter Three). These genes were categorized based on the location of poly(A) sites. Several genes were chosen to demonstrate how APA, especially that occurring in the coding regions and 5’ untranslated regions, might down regulate gene expression by generating truncated transcripts. In animal oocytes, maternally-derived mRNAs are stored with short poly(A) tails and reactivated by the cytoplasmic polyadenylation complex. It has been reported that seeds also contain stored mRNAs. Moreover, germination and its completion are less sensitive to de novo transcription inhibitors than to poly(A) polymerase inhibitors. Together, these considerations suggest that stored RNA without or with a short poly(A) tail (stored, unadenylated RNA) may be present in dry seed and function in seed germination upon reactivation by cytoplasmic polyadenylation. To further explore this, in Chapter Four, mRNA polyadenylation was studied through the course of germination using a combination of transcriptional inhibitors and the modified sequencing protocol described in Chapter Two. 273 putative stored, unadenylated RNAs were identified. Gene ontology analysis revealed that genes whose products are involved in translation are overrepresented; these genes encode 21 60S- and 10 40S-ribosomal proteins. These results indicate that transcripts whose products are involved in translation might be a major component of the stored, unadenylated RNA pool and, more importantly, translation might be the first cellular process to be activated during seed germination.

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Mirdad, Zohair M. "The evaluation and improvement of seed quality and storage potential in cauliflower and cabbage seeds". Thesis, University of Aberdeen, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288381.

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This study aimed to improve seed quality in cauliflower and cabbage, firstly though the development of rapid methods for the evaluation of germination and seed storage potential using measurements of seed leachates conductivity and secondly, through the application of seed treatments both as pre-storage treatments and to improve germination under stress conditions. Significant negative correlations between germination and the conductivity of seed leachate were observed both when seed had high germinations after ageing and when a range of germinations resulted from either combinations of dead plus living seeds, or ageing. This suggested that conductivity measurements could be applied to predict seed germination. Seed quality declined during storage at two moisture contents (12% and 6.5%) and two temperatures (25^oC and 35^oC) as reflected by the increase in seed leachate conductivity and decline in germination and vigour. Differences in seed storage potential were best predicted by the controlled deterioration (CD) test and by CD followed by measurements of leachate conductivity. Other pre-storage assessments (laboratory germination, K_i, conductivity) were less consistent in prediction of storage potential. The second approach used to improve seed quality was to apply pre-storage seed treatments to improve seed storage potential. The most striking improvements in seed storage potential occurred after pre-storage hydration treatments, aerated hydration (AH) for 12h or 18h and water soaking for 3h or 6h, with smaller improvements after antioxidant treatments (0.1% a-tocopherol and 0.1% ascorbic acid). Halogenation (I₂) treatment had no effects on storage potential. Improved seed quality was also revealed after AH treatment by both the increased ability of seed to germinate at high temperature (35^oC) and more rapid germination at reduced water potential and under salinity stress. AH treatment also increased the ability of seeds to recover from exposure to higher temperature (40^oC) and reduced water potential (-1.90 MPa).

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Soltani, Ali. "Improvement of seed germination of Fagus orientalis Lipsky /". Umeå : Dept. of Silviculture, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/s275.pdf.

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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.

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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

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Zaman, S., S. Padmesh e H. Tawfiq. "Effect of Pre-germination Treatments on Seed Germination of Helianthemum lippii (L.) Dum.Cours". University of Arizona (Tucson, AZ), 2009. http://hdl.handle.net/10150/556666.

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Helianthemum lippii (L.) Dum. Cours. is a perennial shrubby plant 10-45 cm tall that belongs to the family Cistaceae. The effects of pretreatments on germination of Helianthemum lippii provide information regarding germination requirements of this species, which could be used for conservation studies. Five different pretreatment were applied to enhance seed germination. Scarification followed by germination at 6 different constant temperatures (10, 15, 20, 25, 30 and 35°C) with continuous light or dark, Scarification followed by GA3 soaking (100, 250,500,750 and 1000 ppm), Heat and moist stratification (only intact seeds), KNO₃ and H₃BO₃ soaking (only intact seeds). The results obtained from this study indicate that germination in H. lippii was promoted by scarification. Scarification of seeds resulted in high germination while increasing germination temperature (35°C) decreased the germination of scarified seeds. Exposure to light and dark had no effect on germination. Heat stratification, cold stratification, KNO₃ and H₃BO₃ treatments were ineffective in increasing germination of H.lippii seeds. Scarification yielded maximum germination without soaking in GA₃ It increased the germination of Helianthemum lippii seeds from 1 to 99%. Increase in GA₃ concentration decreased the germination of this species. Scarification succeeded in breaking dormancy of H.lippii seeds suggesting that this species exhibits seed coat dormancy and in nature it may happen due to the abrasion of seed coat by sand particles or other biotic and abiotic factors.

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Omami, Elizabeth Nabwile. "Amaranthus retroflexus seed dormancy and germination responses to environmental factors and chemical stimulants /". [S.l. : s.n.], 1993. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030603.091907/index.html.

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Sumugat, Mae Rose S. "Glutathione Dynamics in Arabidopsis Seed Development and Germination". Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/36420.

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Seed desiccation and germination have great potential for oxidative stress. Glutathione, one of the most abundant antioxidants in plant cells, is a crucial to the plant's defense mechanisms. To better understand glutathione's responses during these two stages, we examined its dynamics in wildtype Arabidopsis seeds and in a transgenic line containing an antisense glutathione reductase2 (anGR2) cDNA insert. Seeds from the two genotypes were compared morphologically. Glutathione levels in maturing and germinating seeds were measured by HPLC, and GR activity by native PAGE. Cytosolic glutathione was measured in situ by confocal laser scanning microscopy. Stress in the form of natural and accelerated ageing, and germination at high and low temperature and at low water potential was applied to both WT and anGR2 seeds to test vigor. Results show similar glutathione levels and GR activity (except during late imbibition) in WT and anGR2. In both genotypes, GSH/GSSG ratio increased and GR activity decreased during seed maturation. During imbibition, the glutathione pool becomes very reduced (<1% GSSG) and in WT seeds, GSH levels increase mostly by GSSG recycling. Cytosolic GSH in embryonic epidermal cells was estimated to be 1.1-1.6 mM. AnGR2 seeds aged faster, and were less tolerant of heat and drought stress than WT. Accumulation of glutathione during maturation indicated that glutathione is a major antioxidant in the seed during storage. Changes in GSH levels during imbibition coincided with ROS production during radicle protrusion. Under stress conditions, anGR2 seeds showed lower vigor, indicating perturbations in the ROS scavenging systems particularly GR2.
Master of Science

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Kyereh, Boateng. "Seed phenology and germination of Ghanaian forest trees". Thesis, University of Aberdeen, 1994. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU068828.

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Seed production and germination of some timber tree species were studied in Ghana for possible prediction of seed yield and natural regeneration. Seed phenology in 13 species was monitored for two years, using permanent seed traps in two forest sites. Seed germination tests were conducted in neutral, green shade and dark in shade houses for 20 species. In the forest, germination was tested in forest gaps receiving different irradiances. Fruiting frequency ranged from twice in each year to supra-annual fruiting. Fruiting periods for species were consistent between years. Fruiting synchrony was higher among individuals of a population than between sites for the same species. Fecundity differed between years for the majority of species and between sites for species common to both sites. Premature fruit abscission was quite common. Maximum seed weight and percentage germination occurred during peak fall of mature seeds. Seeds of the majority of species germinated equally in light and dark and also in neutral and low red: far red ratio. These included some species previously classified as pioneers. In the forest germination was depressed in a large clearing for the majority of species. The use of photoblastic germination alone to define pioneers leads to a smaller group of pioneer species than is presently recognised. Large gaps due to logging may discourage natural regeneration.

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St, Hilaire Rolston. "Seed Coat Treatments Influence Germination of Taxodium mucronatum". University of Arizona (Tucson, AZ), 2015. http://hdl.handle.net/10150/554341.

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The range of Taxodium mucronatum Ten. (Mexican bald cypress) is declining rapidly, yet relatively little is known about the propagation of this valuable ornamental tree. The objective of this study was to determine whether seed coat treatments could enhance the germination of Mexican bald cypress. Seeds of Mexican bald cypress were collected from Las Cruces and the Gila National Forest, New Mexico. In one experiment, seed coats were knicked or left intact, then germinated on moist filter paper or flooded with water. In another experiment, seed coats from the Las Cruces provenance were treated with sulfuric acid, knicked, left intact, or removed (excised embryos) and germinated on moist filter paper. Knicked and moist seeds had a greater mean cumulative germination percentage (13.5 %) than intact and flooded seeds (4.2 %). Final germination percentage of the Las Cruces source was similar among knicked seeds, intact seeds, and excised embryos, but intact seeds took a longer time (15 days) to reach 50% of final germination percentage than did excised embryos (10 days) and knicked seeds (8 days). Seeds treated with sulfuric did not germinate. Results indicate seed coat pretreatments are needed to release physical dormancy and promote efficient germination of Mexican bald cypress.

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Più fonti

Libri sul tema "Seed germination"

Bradbeer, J. W. Seed Dormancy and Germination. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-7747-4.

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Bradbeer, J. W. Seed Dormancy and Germination. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-011-6574-7.

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Seed dormancy and germination. Glasgow: Blackie, 1988.

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Bradbeer, J. W. Seed dormancy and germination. Glasgow: Blackie, 1988.

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1943-, Kigel Jaime, e Galili Gad 1952-, a cura di. Seed development and germination. New York: M. Dekker, 1995.

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Bradbeer, J. W. Seed dormancy and germination. London: Blackie Academic & Professional, 1988.

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J, Bradford K., e Nonogaki Hiroyuki, a cura di. Seed development, dormancy and germination. Oxford: Blackwell Pub., 2007.

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Gutterman, Yitzchak. Seed Germination in Desert Plants. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-75698-6.

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Bradford, Kent J., e Hiroyuki Nonogaki, a cura di. Seed Development, Dormancy and Germination. Oxford, UK: Blackwell Publishing Ltd, 2007. http://dx.doi.org/10.1002/9780470988848.

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Gutterman, Yitzchak. Seed germination in desert plants. Berlin: Springer-Verlag, 1993.

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Più fonti

Capitoli di libri sul tema "Seed germination"

Fenner, Michael. "Germination". In Seed Ecology, 87–102. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4844-0_6.

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Copeland, Larry O., e Miller B. McDonald. "Seed Germination". In Principles of Seed Science and Technology, 59–110. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-1783-2_4.

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Copeland, Lawrence O., e Miller B. McDonald. "Seed Germination". In Principles of Seed Science and Technology, 72–123. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1619-4_5.

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Martin, R. C., W. E. Pluskota e H. Nonogaki. "Seed Germination". In Plant Developmental Biology - Biotechnological Perspectives, 383–404. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02301-9_19.

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Basuchaudhuri, P. "Seed Germination". In Physiology of Soybean Plant, 17–48. Boca Raton : CRC Press, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9781003089124-2.

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Raghavan, V. "Seed Germination". In Developmental Biology of Flowering Plants, 7–24. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1234-8_2.

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Ungar, Irwin A. "Seed Germination". In Ecophysiology of Vascular Halophytes, 9–48. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003418269-2.

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Bradbeer, J. W. "Germination". In Seed Dormancy and Germination, 27–37. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-7747-4_4.

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Bradbeer, J. W. "Germination". In Seed Dormancy and Germination, 27–37. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-011-6574-7_4.

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Cantliffe, Daniel J., Yu Sung e Warley M. Nascimento. "Lettuce Seed Germination". In Horticultural Reviews, 229–75. Oxford, UK: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470650776.ch5.

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Atti di convegni sul tema "Seed germination"

M, Sandhiya, Visvesh B, Ugendrababu M e Tinisha A. "Varietal Seed Classification and Seed Germination Prediction System". In 2024 Second International Conference on Emerging Trends in Information Technology and Engineering (ICETITE). IEEE, 2024. http://dx.doi.org/10.1109/ic-etite58242.2024.10493438.

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Owen, Micheal D. K. "Weed Seed Dormancy and Germination". In Proceedings of the First Annual Crop Production and Protection Conference. Iowa State University, Digital Press, 1991. http://dx.doi.org/10.31274/icm-180809-360.

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Elisovetcaia, Dina, Raisa Ivanova, Ecaterina Popovschi e Natalia Mashcenco. "Quality changes during storage of beech seeds collected from different places". In Scientific International Symposium "Plant Protection – Achievements and Perspectives". Institute of Genetics, Physiology and Plant Protection, Republic of Moldova, 2023. http://dx.doi.org/10.53040/ppap2023.22.

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In this study, the changes in quality of Fagus sylvatica seeds collected in 2020 from different places of the Republic of Moldova (Plaiul Fagului, Hîrjauca) and Ukraine (Zakarpattia) on the third year of storage were evaluated. Beech seeds quality maintenance depended on the values of moisture, initial viability and seeds germination. The seeds from the Plaiul Fagului with a higher initial germination 76.7-84.0% and lower moisture content (8.69-9.24%) slightly reduced their quality during storage, by 1.0-2.3%.The germination indices such as germination rate, mean daily germination, average seed germination time, total time of seed germination, were improved by treatment of stored seeds with the natural bioregulator, genistifolioside. Treatment with genistifolioside also contributed to the elongation of seed roots by 17-24% in all variants.

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Sorokopudov, V. N. "MPACT OF ENVIRONMENT TEMPERATURE AND STRATIFICATION ON THE CITRUS AURANTIUM SEED GERMINATION". In Agrobiotechnology-2021. Publishing house RGAU-MSHA, 2021. http://dx.doi.org/10.26897/978-5-9675-1855-3-2021-110.

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This study is aimed at investigating the impact of the environment temperature and stratification on the Citrus aurantium seed germination. The results show that the optimum environment temperature for the seed germination is found to be 25°C with the maximum percentage of 90%. The stratification of seeds leads to the seed germination percentage decrease by 69% and germination speed increase by 7 days.

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CRISTINA HIRANO, SÍLVIA, Juliana Aparecida Fracarolli, HUDSON SINHITI NAKAO, FELIPE HIROTAKA DIAS PORTO, ROSA HELENA AGUIAR e PEDRO MOTTA CORRÊA. "MAIZE SEED GERMINATION AT LOW TEMPERATURES". In XXIV Congresso de Iniciação Científica da UNICAMP - 2016. Campinas - SP, Brazil: Galoa, 2016. http://dx.doi.org/10.19146/pibic-2016-52126.

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Kumar, M. Rudra, Avinash Sharma, K. Sreenivasulu e G. Ramesh. "Pivot Based Seed Germination Assessment (PBSGA) Pattern for Germination Quality Analysis". In 2022 International Conference on Inventive Computation Technologies (ICICT). IEEE, 2022. http://dx.doi.org/10.1109/icict54344.2022.9850837.

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Bekuzarova, S. A., e I. A. Shabanova. "Evaluation of seed germination of grassland grasses". In Растениеводство и луговодство. Тимирязевская сельскохозяйственная академия, 2020. http://dx.doi.org/10.26897/978-5-9675-1762-4-2020-74.

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The article presents a new method for determining the germination of seeds by soaking them in water for 1-2 hours, after which the acidity of the solution is measured and at a pH below 6.5 they conclude about low germination.

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Dhasarathan, P., S. Nithica, S. Aparna, K. Cholapandian e A. J. A. Ranjithsingh. "Microbial Isolates for Enhancement of Seed Germination". In 2018 Fourth International Conference on Advances in Electrical, Electronics, Information, Communication and Bio-Informatics (AEEICB). IEEE, 2018. http://dx.doi.org/10.1109/aeeicb.2018.8480966.

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Ma, Shengfang, Yuting Zhou, K. Colton Flynn e Sathyanarayanan N. Aakur. "Peanut Seed Germination Detection from Aerial Images". In 2022 IEEE Applied Imagery Pattern Recognition Workshop (AIPR). IEEE, 2022. http://dx.doi.org/10.1109/aipr57179.2022.10092219.

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Udchumpisai, Wascharin, Yuree Wandee, Ditpon Kotatha e Dudsadee Uttapap. "Seed Priming with Pectic-Oligosaccharides Improved Seed Germination and Growth of Chili". In International Electronic Conference on Applied Sciences. Basel Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/asec2021-11159.

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Rapporti di organizzazioni sul tema "Seed germination"

Wuerslin, Nicole, Franz Lichtner, Nadia Podpora e Simone Whitecloud. Arctic seed sterilization and germination. Engineer Research and Development Center (U.S.), settembre 2023. http://dx.doi.org/10.21079/11681/47682.

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We conducted growth chamber experiments to overcome challenges of native seed germination relating to disease and germination time. We selected five northern species, Eriophorum vaginatum, E. virginicum, Anemone patens var. multifida, Polemonium reptans, and Senecio con-gestus, for their native ranges and commercial-nursery availability. Recommended stratification time for each species was either unknown or a minimum of 60 days. Seeds were sterilized with 70% ethanol, 10% hydro-gen peroxide, or UVC light to identify which method most effectively pre-vented pathogen infection. To determine if stratification time could be reduced, seeds underwent a 30-day cold, moist stratification. We tested which growth medium was most conducive to germination of the sterilized, stratified seeds: filter paper or sterilized potting soil. In a separate experiment, we tested if three different levels of gibberellic acid (GA3; 0, 500, and 1000 ppm) could reduce stratification time to 15 days. The 70% ethanol was effective in a seed surface sterilization; an average of 84% of all seeds for all species treated showed no contamination. Germination following a 30-day cold, moist stratification was unsuccessful for most species tested in both growth media. Here, 1000 ppm GA3 with a 15-day cold, moist stratification showed considerable success with P. reptans.

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

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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.

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Van Haverbeke, David F., e C. W. Comer. Effects of treatment and seed source on germination of eastern redcedar seed. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1985. http://dx.doi.org/10.2737/rm-rp-263.

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Sorenson, Frank C. Stratification period and germination of Douglas-fir seed from Oregon seed orchards: two case studies. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1991. http://dx.doi.org/10.2737/pnw-rn-499.

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Nair, Ajay, Ben Bergaum e Nicholas P. Howell. Effect of Lettuce Seed Treatment with Seed Power® on Germination, Crop Growth, and Fungicide Interaction. Ames: Iowa State University, Digital Repository, 2013. http://dx.doi.org/10.31274/farmprogressreports-180814-400.

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Eaton, D., e C. E. Murphy. Toxicity test of the F-Area seep soils by laboratory lettuce seed germination and seedling growth. Office of Scientific and Technical Information (OSTI), settembre 1993. http://dx.doi.org/10.2172/10128249.

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Sorenson, Frank C. Stratification requirements for germination of western larch (Larix occidentalis Nutt.) seed. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1990. http://dx.doi.org/10.2737/pnw-rn-493.

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Kapulnik, Yoram, Maria J. Harrison, Hinanit Koltai e Joseph Hershenhorn. Targeting of Strigolacatones Associated Pathways for Conferring Orobanche Resistant Traits in Tomato and Medicago. United States Department of Agriculture, luglio 2011. http://dx.doi.org/10.32747/2011.7593399.bard.

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This proposal is focused on examination of two plant interactions: parasitic with Orobanche, and symbiosis with arbuscular mycorrhiza fungi (AMF), and the involvement of a newly define plant hormones, strigolactones (SLs), in these plant interactions. In addition to strigolactones role in regulation of above-ground plant architecture, they are also known to be secreted from roots, and to be a signal for seed germination of the parasitic plants Orobanche. Moreover, secreted strigolactones were recognized as inducers of AMFhyphae branching. The present work was aimed at Generation of RNAi mutants of both tomato and Medicago, targeting multiple genes that may be involved in strigolactone production, carotenoid biosynthesis pathway, Pi signaling or other metabolic pathways, and hence affect AMF colonization and/or Orobanche resistance. Following the newly formed and existing RNAi mutants were examined for AMF colonization and Orobanche resistance. At the first phase of this project Orobanche seed germination assays and AMF colonization were examined in intact plants. These assays were shown to be effective and resulted with enhancement of Orobanche seed germination and AMF colonization in WT tomato plants, whereas roots of strigolactones impaired lines did not result with Orobanche seed germination and mycorrhiza colonization. Unexpectedly, root organ cultures (ROC) that were produced from the same wild type (WT) and mutant lines did not induce the Orobanche seed germination and AMFhyphal branching. This implies that under in vitro conditions ROC cultures are missing an important component for induction of Orobanche seed germination and AMFhyphal branching. In another line of experiments we have tested transgenic lines of Medicagotruncatula for AMFhuyphal branching and Orobanche seed germination assays. These lines included lines silenced for a GRAS transcription factor (RNAi 1845), an NBS-LRR type resistance gene (RNAi 1847), a kinase (RNAi 2403) and a protein of unknown function (RNAi 2417). In all cases, five independent transgenic root lines showed altered AMFphenotypes with reduced or aberrant colonization patterns. Following, we transformed tomato plants with the M. truncatulaTC 127050 PhosphoinositidekinaseRNAi construct. Transgenic lines that contained GUS constructs were used as control. All transgenic lines showed reduced level of Orobanche seed germination, masking any strigoalctones-specific effect. The research demonstrated that SLs production may not be examined in ROC –based bioassays. It was shown by the 3 independent assays employed in this project that none of the recognized characters of SLs may be reflected in these bioassays. However, when the whole plant root exudates were examined, SLs activity in root exudates was demonstrated. Hence, it can be concluded that the presence of an intact shoot, and possibly, shoot factors, may be necessary for production of SLs in roots. Another point of interest that rises from these results is that the presence of SLs is not necessary for AMF completion of life cycle. Hence, it may be concluded that SLs are important for AMFhyphal branching, before symbiosis, but not essential for AMF colonization and life cycle completion under ROC system conditions.

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Nelson, E. A., e H. M. Jr Westbury. Lettuce seed germination and root elongation toxicity evaluation of the F-Area seepline soils. Office of Scientific and Technical Information (OSTI), settembre 1994. http://dx.doi.org/10.2172/10104039.

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Alpsoy, Huseyin Can, e Halil Unal. Effect of Stationary Magnetic Field on Seed Germination and Crop Yield in Spinach (Spinacia oleracea L.). "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, maggio 2019. http://dx.doi.org/10.7546/crabs.2019.05.18.

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