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1
Seker, Murat, Kenan Kaynas, Ahmet Yilmaz e Uygar Us. "Plant and Fruit Characteristics of a Novel White Nectarine Type". HortScience 40, n. 5 (agosto 2005): 1208–12. http://dx.doi.org/10.21273/hortsci.40.5.1208.
Testo completoAbstract (sommario):
In this study, we described some tree and fruit characteristics of a novel white nectarine type. The genetic diversity within this white nectarine population was investigated using six enzyme systems and its isozyme variation was also compared with common peach and nectarine cultivars. The results demonstrated that there was a significant variation within the white nectarine population in terms of plant and fruit characteristics probably due to the repropagation of the white nectarines using seedlings by growers. This variation was also verified by isozyme polymorphisms. Plants characteristics of white nectarines were similar to the trees of common peach or nectarine cultivars. However, the white nectarines produce less yield than the common peach or nectarine cultivars and they have small fruit with white-cream color and small flesh ratio making their fruit less attractive. We believe that the white nectarines have high market value and consumer acceptance because of its unique flavor which was confused with taste of either plums or apricots. So far, no standard white nectarine cultivar has been reported. This is the first report characterizing some plant and fruit characteristics of white nectarines which could be used for breeding of standard white nectarine cultivars with high yield and fruit characteristics while keeping its unique flavor. In addition, the white nectarines represent a novel source of germplasm for improvement of peaches and nectarines.
2
Sherman, W. B., P. M. Lyrene, P. C. Andersen, T. E. Crocker e R. H. Sharpe. "‘Sungem’ Nectarine". HortScience 22, n. 1 (febbraio 1987): 167–68. http://dx.doi.org/10.21273/hortsci.22.1.167b.
Testo completoAbstract (sommario):
Abstract ‘Sungem’ nectarine [Prunus persica (L.) Batsch] (Fig. 1) was released to provide an early ripening nectarine for commercial markets. All nectarines released by the Univ. of Florida begin with the prefix “Sun”. ‘Sun-gem’ is expected to be successful for homeowners, consumer harvest, local markets, and commercial growers with large acreage.
3
Sherman, W. B., P. M. Lyrene e R. H. Sharpe. "‘Sunhome’ Nectarine". HortScience 20, n. 4 (agosto 1985): 775–76. http://dx.doi.org/10.21273/hortsci.20.4.775.
Testo completoAbstract (sommario):
Abstract ‘Sunhome’ nectarine is released by the Univ. of Florida Agricultural Experiment Station. All nectarines released by the Univ. of Florida begin with the prefix of “Sun”. The suffix “home” indicates the intended use of flower, fruit, and foliage in the home yard and garden. ‘Sunhome’ closely resembles ‘Sunred’ nectarine in all respects, except that the spring foliage of the former is red.
4
Liu, Sha, Huan-Huan Gao, Yi-Fan Zhai, Hao Chen, Hai-Yan Dang, Dong-Yun Qin, Li-Li Li, Qiang Li e Yi Yu. "Oviposition Suitability of Drosophila Suzukii (Diptera: Drosophilidae) for Nectarine Varieties and Its Correlation with the Physiological Indexes". Insects 10, n. 8 (24 luglio 2019): 221. http://dx.doi.org/10.3390/insects10080221.
Testo completoAbstract (sommario):
The nectarine is an important fruit, which is attacked by Drosophila suzukii in Europe and the United States but there are no reports of it attacking nectarines in China. Here, we determined the oviposition preference of D. suzukii six on intact and sliced nectarine varieties in China and how physical and physiological indexes of the fruit correlate with these preferences. D. suzukii were allowed to oviposit on two early–, two middle– and two late–maturing varieties of nectarine—Shuguang and Chunguang, Fengguang and Zhong you 4, Zhong you 7 and Zhong you 8, respectively and the number of larvae also followed the order. The firmness, soluble solids content and the nutritional components of the amino acid, protein, soluble sugar and pectin contents of each variety were measured. D. suzukii preferred the early Shuguang variety, followed by the early Chunguang variety and then the middle Zhong you 4 and Fengguang varieties. Taken together, results show that D. suzukii shows preferences for earlier rather than later varieties of nectarines in China and that these preferences are related to the fruit’s physical and physiological traits. Results suggest that mixed cultivation of early–, middle– and late–maturing nectarine varieties should be avoided in order to prevent fly dispersal and infestation by D. suzukii.
5
Olmedo, Patricio, Baltasar Zepeda, Joaquín Delgado-Rioseco, Carol Leiva, Adrián A. Moreno, Karen Sagredo, Francisca Blanco-Herrera et al. "Metabolite Profiling Reveals the Effect of Cold Storage on Primary Metabolism in Nectarine Varieties with Contrasting Mealiness". Plants 12, n. 4 (8 febbraio 2023): 766. http://dx.doi.org/10.3390/plants12040766.
Testo completoAbstract (sommario):
Chilling injury is a physiological disorder caused by cold storage in peaches and nectarines. The main symptom of chilling injury is mealiness/wooliness, described as a lack of juice in fruit flesh. In this work, we studied two nectarine varieties (Andes Nec-2 and Andes Nec-3) with contrasting susceptibility to mealiness after cold storage. A non-targeted metabolomic analysis was conducted by GC-MS to understand if changes in metabolite abundance are associated with nectarine mealiness induced by cold storage. Multivariate analyses indicated that in unripe nectarines, cold storage promoted a higher accumulation of amino acids in both varieties. Interestingly, for ripe nectarines, cold storage induced an accumulation of fewer amino acids in both varieties and showed an increased abundance of sugars and organic acids. A pathway reconstruction of primary metabolism revealed that in ripe nectarines, cold storage disrupted metabolite abundance in sugar metabolism and the TCA cycle, leading to a differential accumulation of amino acids, organic acids, and sugars in mealy and juicy nectarines.
6
Villamor, D. E. V., T. A. Mekuria, S. S. Pillai e K. C. Eastwell. "High-Throughput Sequencing Identifies Novel Viruses in Nectarine: Insights to the Etiology of Stem-Pitting Disease". Phytopathology® 106, n. 5 (maggio 2016): 519–27. http://dx.doi.org/10.1094/phyto-07-15-0168-r.
Testo completoAbstract (sommario):
Recent studies have shown the superiority of high-throughput sequencing (HTS) technology over many standard protocols for pathogen detection. HTS was initiated on fruit tree accessions from disparate sources to improve and advance virus-testing procedures. A virus with genomic features resembling most closely that of the recently described Nectarine stem-pitting-associated virus, putative member of genus Luteovirus, was found in three nectarine trees (Prunus persica cv. nectarina), each exhibiting stem-pitting symptoms on the woody cylinder above the graft union. In these samples, HTS also revealed the presence of a coinfecting virus with genome characteristics typical of members of the genus Marafivirus. The same marafivirus- and luteovirus-like viruses were detected in nonsymptomatic nectarine and peach selections, indicating only a loose relationship between these two viruses with nectarine stem-pitting disease symptoms. Two selections infected with each of these viruses had previously tested free of known virus or virus-like agents using the current biological, serological, and molecular tests employed at the Clean Plant Center Northwest. Overall, this study presents the characterization by HTS of novel marafivirus- and luteovirus-like viruses of nectarine, and provides further insights into the etiology of nectarine stem-pitting disease. The discovery of these new viruses emphasizes the ability of HTS to reveal viruses that are not detected by existing protocols.
7
Okie, W. R. "Inheritance of the Roughskin Character in Peach". HortScience 31, n. 4 (agosto 1996): 618d—618. http://dx.doi.org/10.21273/hortsci.31.4.618d.
Testo completoAbstract (sommario):
Pubescence in peach fruit is controlled by the Gg locus, with the homozygous recessive being the glabrous-skinned nectarine. The roughskin character in peach causes the loss of all long hairs on the epidermis of the fruit. Under a microscope short stubs are visible. The fruit is rough to the touch and appears dull rather than shiny as a nectarine would appear. A pleiotropic effect is lack of hairs on the dormant leaf and flower buds, making them noticeably shiny to the naked eye, unlike normal peaches and nectarines. The roughskin character appeared in 3 of 70 seedlings from the cross of Pekin × Durbin. The remaining seedlings all produced normal peaches. Sibling F2 progenies segregated for peach and nectarine, and in one case, for roughskin as well, indicating the cross was valid. Results from numerous crosses and F2 populations indicate this character is controlled by a single recessive gene, which is hereby designated rs. Nectarines homozygous for this gene have glabrous buds, but otherwise appear normal. The origin of the mutation is unclear. Selfed seedlings of Pekin and Durbin have not expressed the recessive form of the gene. Possibly a limb of the Pekin tree (now gone) used for the crosses had mutated to the recessive form at one or both loci. The homozygous roughskin progeny would have then been inadvertent self-pollinations rather than hybrids, since none of them segregated for nectarine.
8
Harvey, John M., C. Max Harris e Preston L. Hartsell. "Tolerances of California Nectarine Cultivars to Methyl Bromide Quarantine Treatments". Journal of the American Society for Horticultural Science 114, n. 4 (luglio 1989): 626–29. http://dx.doi.org/10.21273/jashs.114.4.626.
Testo completoAbstract (sommario):
Abstract The tolerance of six cultivars of nectarine [Prunus persica (L.) Batsch var. nectarina (Ait.) Maxim.] to methyl bromide (MB) quarantine treatments was determined. A treatment, 48 g MB/m3 for 2 hr at 21C, which controlled codling moth [Cydia pomonella (L.)], caused no significant phytotoxic response in any of the cultivars. The threshold for injury at the above time and temperature was ≈64 g MB/m3 in ‘Summer Grand’, ‘May Grand’, ‘Fantasia’, and ‘Firebrite’; between 48 and 64 g MB/m3 in ‘Red Diamond’; and between 80 and 96 g MB/m3 in ‘Spring Red’. All fumigated nectarines were significantly firmer than the control fruit after storage for 7 days at 2.5C, but subsequently ripened satisfactorily; soluble solids content of the fruit was not affected by the fumigations used in this study. Inorganic bromide residues in fruit treated with the 48 g·m−3 dosage at 21C or above ranged from 3.5 to 7.2 ppm, well below the U.S. tolerance of 20 ppm. Organic bromide residues were <0.01 ppm within 48 hr after treatment.
9
Wociór, Stanisław. "Growth and cropping of two cultivars of peach and nectarine in the conditions of the Sandomierska Plateau". Folia Horticulturae 21, n. 1 (1 giugno 2009): 73–80. http://dx.doi.org/10.2478/fhort-2013-0127.
Testo completoAbstract (sommario):
Abstract In this experiment, the growth of peach and nectarine trees was determined to be related to the cultivar. ‘Inka’ peach trees grew weaker than ‘Harbinger’ trees. The ‘John Rivers’ nectarine was characterized by stronger growth than the ‘Harko’. The amount of crops produced by the trees was related to the cultivar and the meteorological conditions during winter and spring. ‘Inka’ produced higher yields and bigger fruits as compared to ‘Harbinger’. The ‘Harko’ cultivar provided significantly higher yields than the ‘John Rivers’ only in 2006. Peach and nectarine fruit production in the Sandomierska Plateau in the years 2004 − 2007 was risky. In 2006, damage to the flower buds during winter caused no crop yield in young peach trees and the older ones of the ‘Harbinger’ cultivar. A minor reaction to the temperature drop, down to -26.8oC, was found for nectarines in comparison with peach trees. In 2007, the spring frost injured flower pistils and caused a lack of crops from the studied cultivars.
10
LASLO, Vasile, Alin C. TEUSDEA, Sonia A. SOCACI, Daniel MIERLITA e Simona I. VICAS. "Influence of Pasteurization on Total Phenols Content and Antioxidant Capacity of Prunus persica L. Juices". Notulae Botanicae Horti Agrobotanici Cluj-Napoca 45, n. 2 (15 settembre 2017): 553–60. http://dx.doi.org/10.15835/nbha45210699.
Testo completoAbstract (sommario):
Peach and nectarine (Prunus persica ) production has an important place in the world, being the most important fruit after apple crops in the European Union. Because the fruits are perishable, it is desirable to valorize them as juice. Seven peaches and three nectarines cultivars grown in the N-W part of Romania were investigated for quality parameters, volatile profile, total phenols content and antioxidant capacity. The volatile composition of peach and nectarine cultivars was determined via the ITEX/GC-MS technique, the main volatile compounds belonging to alcohols and aldehydes. Another objective was to obtain the pasteurised juices from these fruits and to investigate the best time of pasteurisation in order to identify the most valuable cultivar from the perspective of total phenols content and its antioxidant capacity. For a better interpretation of results and a proper discrimination between cultivars, according to the total phenols content and antioxidant capacity, the multivariate analysis, Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA) were applied. The peach cultivars showed the highest content in total phenols compared with nectarine. From peach cultivars, the highest concentration was recorded in ‘Southland’ (47.49 ± 0.14 mg GAE 100 g-1 FW) and from nectarine cultivars in ‘Romamer’ (16.28 ± 0.83 mg GAE 100 g-1 FW). The highest antioxidant capacities were recorded in ‘Southland’ peach in the case of both methods (DPPH and FRAP). The results showed that ‘Southland’ peach and ‘Romamer’ nectarine pasteurised juices are the best from the point of view of total phenolic compounds content with high antioxidant capacity.
11
Smykov, A. V., E. P. Shoferistov e N. V. Mesyats. "Conveyor of a new assortment of peaches and nectarines for Crimea and southern Russia". Plant Biology and Horticulture: theory, innovation, n. 159 (28 luglio 2021): 72–82. http://dx.doi.org/10.36305/2712-7788-2021-2-159-72-82.
Testo completoAbstract (sommario):
Aim and task: Goals and objectives: to form a conveyor of industrial assortment of peach and nectarine for the Crimea and southern Russia. To do this, study the new varieties of peach and nectarine bred by the Nikitsky Botanical Gardens for a complex of economic and biological characteristics. The study of varieties was carried out according to the "Program and methodology for the study of varieties of fruit, berry and nut crops" (Sedov, 1995), as well as in accordance with the classifier (Khloptseva, Sharova, Korneichuk, 1988). 34 new varieties of peach and 7 - nectarine of NBG selection of different ripening periods were studied by a complex of economically valuable traits. Genotypes with a complex of outstanding properties in terms of yield, frost resistance of flower buds, drought resistance, resistance to fungal diseases, and commercial qualities of fruits with an increased content of biologically active substances have been identified. A conveyor belt of a new industrial assortment of peaches and nectarines of the Nikitsky Botanical Garden selection for gardening in Crimea and southern Russia has been proposed.
12
Sarkhosh, Ali, Mercy Olmstead, Jose Chaparro, Pete Andersen e Jeff Williamson. "Florida Peach and Nectarine Varieties". EDIS 2018 (27 settembre 2018): 17. http://dx.doi.org/10.32473/edis-mg374-2018.
Testo completoAbstract (sommario):
The Florida stone fruit breeding program began in 1952, under the direction of Dr. Ralph Sharpe. The major goal of Dr. Sharpe’s breeding program was to take advantage of the climate in Florida to provide early, high-quality fruit to the market (Sherman et. al., 1996). In 1966, Dr. Wayne Sherman became the leader of the stone fruit breeding program, and he continued to focus on breeding for low-chill peach cultivars with non-melting flesh that perform well in Florida’s subtropical climate. The current stone fruit breeder, Dr. Jose Chaparro, has overseen and initiated research to bring in unique plant material that focuses on large, high-quality fruit with disease resistance and low chilling requirements. Peaches and nectarines are the same species, Prunus persica, but nectarines differ from peaches in that they lack “peach fuzz.” Therefore, the following discussion applies to both peaches and nectarines, but in most cases reference will be made only to peaches. This 17-page publication is a minor revision written by Ali Sarkhosh, Mercy Olmstead, Jose Chaparro, Pete Andersen, and Jeff Williamson, and published by the Horticultural Sciences Department, October 2018. Cir1159/MG374: Florida Peach and Nectarine Varieties (ufl.edu)
13
Aitouakli, Thilelli, e Ettayib Bensaci. "Breeding Ecology and Nest- Site Selection of Turtle Doves (Streptopelia turtur) in Three New Orchard Habitats". Journal of Bioresource Management 8, n. 2 (23 aprile 2021): 01–13. http://dx.doi.org/10.35691/jbm.1202.0175.
Testo completoAbstract (sommario):
The main aim of our work was to investigate the breeding parameters in three orchard types in Algeria (apple, cherry and nectarine) for better conservation of existing species. A total of 149 active Turtle dove nests were monitored in these man–made agro-systems. Egg laying occurred from early May and continued until mid-August. Egg laying started later in cherry trees and stopped earlier in nectarines. Nest density was higher in apple orchards. Nests were located higher in nectarine. Clutch size was similar among orchard types. Northeast was the dominant orientation in all orchards. Breeding success was higher than that recorded in former studies. Desertion was the main cause of nest failure. The apple orchards are the preferred breeding area for turtle dove in this region.
14
El-Wazir, Fairuz, Dangyang Ke e Adel A. Kader. "TOLERANCE OF NECTARINE AND PEACH CULTIVARS TO INSECTICIDAL CONTROLLED ATMOSPHERES". HortScience 27, n. 6 (giugno 1992): 678a—678. http://dx.doi.org/10.21273/hortsci.27.6.678a.
Testo completoAbstract (sommario):
The tolerances (based on time before detection of off-flavor) of nectarine and peach cultivars to an insecticidal controlled atmosphere of 0.25% O2 (balance N2) at 20C were 2.8, 4.0, 4.0, 4.4, 5.1, and 5.3 days for `John Henry' peaches, `Fantasia' nectarines, `Five Red' peaches, `O'Henry' peaches, `Royal Giant' nectarines, and `Flamekist' nectarines, respectively. The greater sensitivity of `John Henry' peaches to low O2 stress was associated with a higher respiration rate; faster accumulation rates of acetaldehyde, ethanol, and ethyl acetate; and a more mature and larger fruit. The tolerances of `Fairtime' peaches to 0.21% O2 + 99% CO2 at 20C, 0.21 O2 + 99% CO2 at 0C, and 0.21% O2 at 20C were 3.8, 5.0, and 6.0 days respectively. There was a good correlation between tolerance of nectarines and peaches to insecticidal atmospheres and the accumulation rates of acetaldehyde (r=-0.94, p<0.01) and ethanol (r=-0.88, p,0.01).
15
Ramming, D. W. "Genetic control of a slow-ripening fruit trait in nectarine". Canadian Journal of Plant Science 71, n. 2 (1 aprile 1991): 601–3. http://dx.doi.org/10.4141/cjps91-090.
Testo completoAbstract (sommario):
Inheritance of a slow-ripening trait was investigated in segregating progenies of nectarine (Prunus Persica (L.), Batsch var. nucipersica Schneid). Segregation ratios suggest that the trait is controlled by a single recessive gene, for which the symbol sr is proposed. Fantasia, Flamekist, and Fairlane nectarines are heterozygous at the sr locus. Key words: Peach, breeding, postharvest, genetics, stone fruit
16
Cheng, Guiwen W., e Carlos H. Crisosto. "Browning Potential, Phenolic Composition, and Polyphenoloxidase Activity of Buffer Extracts of Peach and Nectarine Skin Tissue". Journal of the American Society for Horticultural Science 120, n. 5 (settembre 1995): 835–38. http://dx.doi.org/10.21273/jashs.120.5.835.
Testo completoAbstract (sommario):
The relationship of phenolic composition and polyphenoloxidase activity (PPO, E.C. 1.14.18.1) to browning potential (BP) was studied in buffer extracts of peach [Prunus persica L. Batsch) and nectarine [P. persica var. nectarine (L.) Batsch] fruit skin. The BP varied among cultivars with `Flavorcrest' having the highest value and `Maycrest' the lowest. On average, over 83 % of the browning measured at the end of the S-hour incubation occurred during the first hour. The total soluble phenolics (TSP), the total anthocyanin (TA), and glutathione content (GLU) varied among cultivars, but were not significantly correlated to the BP. Of the phenolics determined by HPLC, only chlorogenic acid had a significant positive correlation and epicatechin a significant negative correlation with BP by the first hour of incubation. The PPO activity, ranging from 4 to 11 optical density units per gram dry weight per minute among peaches and nectarines, was not significantly correlated with BP. However, no browning was detected if the buffer extract was previously boiled. These results indicated that browning in the buffer extracts of peach and nectarine skin tissue depends on the presence of PPO activity and chlorogenic acid, which are major contributors to enzymatic browning.
17
Beckman, T. G., W. R. Okie, G. Krewer e W. B. Sherman. "Moderate-chilling Peach Breeding Project for the Coastal Plain of the Southeastern United States". HortScience 30, n. 4 (luglio 1995): 833B—833. http://dx.doi.org/10.21273/hortsci.30.4.833b.
Testo completoAbstract (sommario):
The purpose of this three-way cooperative project is to develop new fresh-market peach and nectarine varieties in the 400 to 650 chill hour range for the early season shipping market. Since 1990, >3000 seedlings have been evaluated, resulting in 48 selections. Additionally, several hundred selections from other programs have been evaluated. `Sunsplash', an attractive, early season, 400 chill hour nectarine, was released in 1993 as a result of this cooperative effort. A novel aspect of the program has been the use of non-melting flesh parents for the purpose of improving handling characteristics. Selections include both yellow- and white-flesh types, peaches and nectarines. Some may be adapted for use in other production areas and are available for testing under non-propagation agreement. Evaluation summaries of selections and standards will be presented.
18
Crooker, Barbara. "Nectarine". Gastronomica 13, n. 3 (2013): 71. http://dx.doi.org/10.1525/gfc.2013.13.3.71.
Testo completo
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Ahmad, Riaz, Dan Potter e Stephen M. Southwick. "Genotyping of Peach and Nectarine Cultivars with SSR and SRAP Molecular Markers". Journal of the American Society for Horticultural Science 129, n. 2 (marzo 2004): 204–10. http://dx.doi.org/10.21273/jashs.129.2.0204.
Testo completoAbstract (sommario):
Simple sequence repeat (SSR) and sequence related amplified polymorphism (SRAP) molecular markers were evaluated for detecting intraspecific variation in 38 commercially important peach and nectarine (Prunus persica) cultivars. Out of the 20 SSR primer pairs 17 were previously developed in sweet cherry and three in peach. The number of putative alleles revealed by SSR primer pairs ranged from one to five showing a low level of genetic variability among these cultivars. The average number of alleles per locus was 2.2. About 76% of cherry primers produced amplification products in peach and nectarine, showing a congeneric relationship within Prunus species. Only nine cultivars out of the 38 cultivars could be uniquely identified by the SSR markers. For SRAP, the number of fragments produced was highly variable, ranging from 10 to 33 with an average of 21.8 per primer combination. Ten primer combinations resulted in 49 polymorphic fragments in this closely related set of peaches and nectarines. Thirty out of the 38 peach and nectarine cultivars were identified by unique SRAP fingerprints. UPGMA Cluster analysis based on the SSR and SRAP polymorphic fragments was performed; the relationships inferred are discussed with reference to the pomological characteristics and pedigree of these cultivars. The results indicated that SSR and SRAP markers can be used to distinguish the genetically very close peach and nectarine cultivars as a complement to traditional pomological studies. However, for fingerprinting, SRAP markers appear to be much more effective, quicker and less expensive to develop than are SSR markers.
20
Hong, C. X., e T. J. Michailides. "Prune, Plum, and Nectarine as Hosts of Trichothecium roseum in California Orchards". Plant Disease 81, n. 1 (gennaio 1997): 112. http://dx.doi.org/10.1094/pdis.1997.81.1.112d.
Testo completoAbstract (sommario):
Trichothecium roseum (Pers.:Fr.) Link was frequently observed (up to 21%) on mummified peach (Prunus persica (L.) Batsch), nectarine (P. persica (L.) Batsch var. nectarina (Aiton) Maxim.), plum (P. salicina Lindl.), and prune (P. domestica L.) fruits in orchards during a 1995 to 1996 survey. Pink mold rot caused by T. roseum was also frequently observed (at about the 1 to 2% level) on a number of samples of prune fruit collected from commercial orchards in Glenn, Butte, Madera, Fresno, and Tulare counties in 1996, after storage at 4°C for 7 days and then 20°C for 4 days. Wounded and nonwounded prune (cv. French), plum (cv. Casselman), peach (cv. Fairtime), and nectarine (cv. Spring Bright) fruits were infected after inoculation with a drop (20 μl) of T. roseum suspension (5 × 105 conidia/ml). Characteristic pink sporulation covered the surface of most fruit 7 days after inoculation. Conidia of T. roseum completely covered all wounded and nonwounded prune fruit, sparsely on the wounded plum fruit, and densely on both wounded and nonwounded peach and nectarine fruits (lesion diameter = 1 to 7 cm) 2 weeks after inoculation. T. roseum sporulated more rapidly and better on the fruits that were contaminated with either Monilinia fructicola (G. Wint.) Honey, or a Cladosporium sp. Peach has been listed as a host of T. roseum (California Plant Disease Host Index, Part 1: Fruits and Nuts, A M. French, ed., 1987), but this is the first report on the pathogenicity of this fungus on prune, plum, and nectarine from California.
21
Miao, Ronghui, Jinlong Wu, Hua Yang e Fenghua Huang. "Nectarine Disease Identification Based on Color Features and Label Sparse Dictionary Learning with Hyperspectral Images". Applied Sciences 13, n. 21 (31 ottobre 2023): 11904. http://dx.doi.org/10.3390/app132111904.
Testo completoAbstract (sommario):
Fruit cracking and rust spots are common diseases of nectarines that seriously affect their yield and quality. Therefore, it is essential to construct fast and accurate disease-identification models for agricultural products. In this paper, a sparse dictionary learning method was proposed to realize the rapid and nondestructive identification of nectarine disease based on multiple color features combined with improved LK-SVD (Label K-Singular Value Decomposition). According to the color characteristics of the nectarine itself and the significant color differences existing in the three categories of nectarine (diseased, normal, and background parts), multiple color spaces of RGB, HSV, Lab, and YCbCr were studied. It was concluded that the G channel in RGB space, Y channel in YCbCr space, and L channel in Lab space can better distinguish the diseased part from the other parts. At the model-training stage, pixels of the diseased, normal, and background parts in the nectarine image were randomly selected as the initial training sets, and then, the neighboring image blocks of the pixels were selected to construct the feature vectors based on the above color space channels. An improved LK-SVD dictionary learning algorithm was proposed that integrated the category label into the process of dictionary learning, and thus, an over-complete feature dictionary with significant discrimination was obtained. At the model-testing stage, the orthogonal matching pursuit (OMP) algorithm was used for sparse reconstruction of the original data, which can obtain the classification categories based on the optimized feature dictionary. The experimental results show that the sparse dictionary learning method based on multi-color features combined with improved LK-SVD can identify fruit cracking and rust spot diseases of nectarines quickly and accurately, and the average overall classification accuracies were 92.06% and 88.98%, respectively, which were better than those of k-nearest neighbor (KNN), support vector machine (SVM), DeepLabV3+, and Unet++; the identification results of DeepLabV3+ and Unet++ were also relatively high, but their average time costs were much higher, requiring 126.46~265.65 s. It is demonstrated that this study can provide technical support for disease identification in agricultural products.
22
Jemrić, Tomislav, e Goran Fruk. "Postharvest Quality of Nectarine cv. ‘Venus’ as Affected by Hot Water Dips and Length of Storage". АГРОЗНАЊЕ 14, n. 1 (15 novembre 2013): 19. http://dx.doi.org/10.7251/agren1301019j.
Testo completoAbstract (sommario):
The effect of hot water dip (48° C) duration (6 or 12 minutes) (HWD 48° C 6' and HWD 48° C 12') and length of storage at 0° C in normal atmosphere (two or four weeks) on chemical and sensory quality of nectarine (Prunus persica var. nectarina cv. 'Venus') was studied. After two weeks of storage, HWD-treated fruits had significantly lower weight loss and SSC compared to control. There was no significant difference between HWD 48 °C 6' and HWD 48 °C 12' – treated fruit. HWD 48 °C 12' - treated fruit maintained sensory quality after two weeks of storage. After four weeks of storage, control fruit received higher scores compared to HWD – treated fruit for all traits, except for aroma which was still higher for HWD 48 °C 12' - treated fruit. Duration of hot water dip is significant factor for maintaining postharvest quality of nectarine fruit.
23
Okie, W. R. "“Peach and Nectarine Varieties”-A Hypertext Index". HortScience 28, n. 12 (dicembre 1993): 1186–87. http://dx.doi.org/10.21273/hortsci.28.12.1186.
Testo completoAbstract (sommario):
“Peach and Nectarine Varieties” is a self-contained computer program describing more than 600 varieties and their performance in the southeastern United States. The information can be accessed in various ways, including searching for any word or name. A Master Index of names and synonyms lists more than 6000 names used in the United States, plus many foreign names. This index includes pedigree, origin, and a coded description. General information is included regarding peaches and nectarines. All North American breeding programs are chronicled. The program is available for MS-DOS computers with an EGA or VGA monitor, and may be freely distributed.
24
Crisosto, Carlos H., Gayle M. Crisosto, Gemma Echeverria e Jaume Puy. "Developing a Tree Fruit Code [Prunus persica (Batch.)] for Cultivars According to Their Organoleptic Characteristics". HortScience 40, n. 4 (luglio 2005): 1145A—1145. http://dx.doi.org/10.21273/hortsci.40.4.1145a.
Testo completoAbstract (sommario):
Cultivar segregation according to their organoleptic perception was attempted by using trained panel data evaluated by principal component analysis in four sources of 24 peach and 27 nectarine cultivars as a part of our program to develop minimum quality indexes. Source significantly affected cultivar ripe soluble solids concentration (RSSC) and ripe titratable acidity (RTA), but it did not significantly affect sensory perception of flavor, sourness and aroma by the trained panel. On two out of 51 cultivars tested, source played a role on sweetness perception. In all of these cases, when source fell out of the proposed cultivar organoleptic group it could be explained by fruit being harvested outside the commercial physiological maturity (immature or overmature). The perception of the four sensory attributes was reduced to three principal components that explain 92% for peach and 94% for nectarine of the variation in the sensory characteristics of the cultivars tested. Season did not affect significantly the classification of three cultivars that were evaluated during these two seasons. By plotting organoleptic characteristics in PC1 and PC2 (∼76%), cultivars were segregated into groups (balanced, robust, sweet, peach or nectarine aroma, and/or peach or nectarine flavor) with similar sensory attributes; nectarines were classified into five groups and peaches into four groups. Based on this information, we recommend that cultivars should be clustered in organoleptic groups and a development of a minimum quality index should be attempted within each organoleptic group rather than proposing a generic minimum quality index based on RSSC. This organoleptic cultivar classification will help to match ethnic preferences and enhance the current promotion and marketing programs.
25
Baugher, Tara Auxt, e Stephen S. Miller. "Nectarine Pox: A Disorder of Nectarine Fruit". HortScience 26, n. 3 (marzo 1991): 310. http://dx.doi.org/10.21273/hortsci.26.3.310.
Testo completo
26
Scalisi, Alessio, Mark G. O’Connell, Daniele Pelliccia, Tim Plozza, Christine Frisina, Subhash Chandra e Ian Goodwin. "Reliability of a Handheld Bluetooth Colourimeter and Its Application to Measuring the Effects of Time from Harvest, Row Orientation and Training System on Nectarine Skin Colour". Horticulturae 7, n. 8 (19 agosto 2021): 255. http://dx.doi.org/10.3390/horticulturae7080255.
Testo completoAbstract (sommario):
This work aimed to (i) determine the reliability of a portable Bluetooth colourimeter for fruit colour measurements; (ii) characterise the changes in quantitative skin colour attributes in a nectarine cultivar in response to time from harvest; and (iii) determine the influence of row orientation and training system on nectarine skin colour. The skin colour attributes measured with the colourimeter, namely L*, a* and b*, were calibrated and validated against a reference spectrophotometer. C* and h° were obtained from a* and b*. Skin colour was measured in situ from 42 days before to 6 days after harvest on ‘Majestic Pearl’ nectarines subjected to different row orientations and training systems. Validation models showed high reliability of colour estimations. The trends of colour attributes over time were characterised by cubic regression models, with h° proving to be the best parameter to describe changes of colour over time, with a clear link to the maturation process. No significant effects of row orientation and training system on skin colour were observed at harvest. Overall, the device proved reliable for fruit colour detection. Results of this study highlight the potential of h° as a quantitative index to monitor ripening prior to harvest in ‘Majestic Pearl’ nectarines.
27
Jayarajan, Smruthi, Shruti Sethi, Om Prakash Awasthi, Abhishek Sharma e Danka Bukvički. "Synergistic Influence of Melatonin-Hydrocolloid Coating on Decay and Senescence of Nectarine (Prunus persica var. nucipersica) during Supermarket Storage Conditions". Plants 13, n. 6 (13 marzo 2024): 822. http://dx.doi.org/10.3390/plants13060822.
Testo completoAbstract (sommario):
Nectarines have remarkable nutritional value, low caloric content, and are rich in antioxidants. However, despite substantial local and global demand, their susceptibility to rapid spoilage during peak summer harvest is limited. To address this issue, the current study investigated the potential benefits of using melatonin (MLT), an antioxidant biomolecule, in combination with edible hydrocolloid coatings like carboxymethylcellulose (CMC) and gum Arabic (G.A.) on ‘Snow Queen’ nectarine fruits. The nectarines were treated with various combinations of coatings, including 1% and 1.5% CMC, 8% and 10% G.A., and 0.1 mM melatonin. These coated and non-coated samples were stored under standard supermarket conditions (18 ± 1 °C, 85–90% R.H.) for 16 days. The outcomes demonstrated that the most effective treatment was the combination of 1% CMC with 0.1 mM melatonin. This treatment significantly (p ≤ 0.05) reduced the rate of respiration, curbed fruit decay by approximately 95%, minimized weight loss by around 42%, and maintained approximately 39% higher levels of total phenol content and roughly 30% greater antioxidant (AOX) activity. These positive effects were accompanied by preserved firmness and overall quality attributes. Moreover, the treatment extended the shelf life to 16 days through retarding senescence and suppressing the activities of lipoxygenase (LOX) and pectin methylesterase (PME), all without compromising the functional qualities of the nectarine.
28
Layne, Desmond R., e W. R. Okie. "(94) White-fleshed Peaches and Nectarines for the Southeastern United States". HortScience 41, n. 4 (luglio 2006): 1029B—1029. http://dx.doi.org/10.21273/hortsci.41.4.1029b.
Testo completoAbstract (sommario):
White-fleshed peaches and nectarines are delicacies that have been enjoyed for centuries around the world. They are native to China and were introduced to the United States in the 1800s. Some white-fleshed peaches and nectarines are highly perishable and bruise easily, but are of very high eating quality. These are perhaps best suited for the local roadside market, where they can be sold and consumed more quickly. Others are much firmer at harvest, have a longer shelf life. and are suitable for long-distance transport to wholesale markets. White-fleshed peaches and nectarines may have some acidity or they may be very low acid with high sugar content (°Brix). Some novel flat (peento or donut) types also exist. Proximity to an urban market with a substantial Asian population is advantageous because Asians, in particular, often prefer the low-acid flavor and are willing to pay premium prices for high quality fruits. In our peach and nectarine cultivar evaluation program at Clemson University, we are currently evaluating 70 cultivars and advanced selections at four different locations in South Carolina. Several of these have been evaluated since 2000 and the “top performers” over the last six seasons by ripening date (earliest to latest) include the following: `Sugar May', `Scarletpearl', `Snowbrite', `Southernpearl', `White Lady', `Sugar Lady', `Summer Sweet', `Sugar Giant', `Stark's Summer Pearl', `Snow King', and `Snow Giant'. In general, most of the white nectarines and the flat/donut peaches and nectarines have serious problems with insect damage and brown rot. Complete details of our peach and nectarine (yellow- and white-flesh) evaluation work in South Carolina since 2000 will be noted by referring to my peach website (http://www.clemson.edu/hort/Peach/index.php).
29
Wen, I.-C., W. B. Sherman e K. E. Koch. "Heritable Pleiotropic Effects of the Nectarine Mutant from Peach". Journal of the American Society for Horticultural Science 120, n. 5 (settembre 1995): 721–25. http://dx.doi.org/10.21273/jashs.120.5.721.
Testo completoAbstract (sommario):
Peach-to-nectarine mutations are associated with broad pleiotropic effects. The present study addresses the heritability of nectarine-specific effects in three hybrid families. A comparison of peach and nectarine siblings showed that nectarine fruit were smaller (less fresh weight), rounder, darker, redder, and had higher levels of sugars and organic acids. These heritable characteristics are similar to effects of spontaneous peach-to-nectarine mutations described previously.
30
Mihaylova, Dasha, Aneta Popova, Zhivka Goranova, Dorina Petkova, Pavlina Doykina e Anna Lante. "The Perspective of Nectarine Fruit as a Sugar Substituent in Puddings Prepared with Corn and Rice Starch". Foods 10, n. 11 (24 ottobre 2021): 2563. http://dx.doi.org/10.3390/foods10112563.
Testo completoAbstract (sommario):
It has been long recognized that fruits are healthy diet compounds as they are excellent sources of health-beneficial bioactive components (polyphenols, minerals, vitamins, organic acids, etc.). The diversification of the consumer’s taste calls for an expansion of food options and novel ingredients. Puddings are a well-known food choice introduced in the human diet at a very early age because of their easy and high digestion. Four formulations with two types of starch (corn and rice) were selected as object of analysis. Nectarines were incorporated as a purée, and lyophilized powder. The nectarine variety “Gergana”, used for the preparations, is a local variety with proven beneficial properties. The study aimed at analyzing the physical (moisture, ash, color, water-holding capacity, water activity, density and syneresis), textural (firmness, gumminess, cohesiveness, springiness, and chewiness), nutritional, and sensory characteristics of the nectarine-enriched puddings. The outcomes obtained from this study provided significant information about the possible application of the formulations in the children’s daily menus. All four formulations had distinct peachy aroma. The formulations prepared with nectarine purée resulted in a better sensory perception about their texture, and better water-holding capacity. At this point, the formulation prepared with lyophilized fruit and rice starch has the most promising results. Sufficient evidence leads to further exploration of the perspective of fruit-enriched puddings in order to improve their technological and health-promoting properties.
31
Petruccelli, Raffaella, Alessandra Bonetti, Leonardo Ciaccheri, Francesca Ieri, Tommaso Ganino e Cecilia Faraloni. "Evaluation of the Fruit Quality and Phytochemical Compounds in Peach and Nectarine Cultivars". Plants 12, n. 8 (12 aprile 2023): 1618. http://dx.doi.org/10.3390/plants12081618.
Testo completoAbstract (sommario):
Qualitative traits and chemical properties of 32 peach cultivars (yellow flesh and white flesh fruits) and 52 nectarine cultivars (yellow flesh and white flesh fruits) of different pomological characteristics is performed, and the correlation between cultivars and chemical characteristics is analyzed. Yellow nectarines have a higher variability in soluble solids concentration (SSC) and titratable acidity (TA) values. Evaluation of color parameters (a*, b*, L*) shows a significant interaction between pulp color (white vs. yellow) and types (peaches vs. nectarines) of fruit. The difference between yellow and white fruits is stronger in nectarines than in peaches. Sucrose is the main sugar detected in peach fruits, with a percentage content of 78.37% and 76.70% of the total sugar content in yellow and white peaches, respectively, and 78.29% and 78.12% in yellow and white nectarines, respectively. Variability is found among cultivars for the chemical compounds analyzed. The yellow flesh has higher amounts of total carotenoids and TPC, while white-flesh fruits present an average antioxidant value higher than yellow-flesh fruits. No significant correlation is found for polyphenol content and DPPH, while an interaction (p < 0.005) between neochlorogenic acid content and peaches and nectarines is evidenced, with a neochlorogenic acid content higher in nectarines than in peaches.
32
Luchsinger, L. E., G. H. Reginato e P. Miranda. "172 Changes in Quality and Maturity of Early Season Nectarines (cvs. Aurelio and Early May) during Maturation and Ripening". HortScience 34, n. 3 (giugno 1999): 471F—472. http://dx.doi.org/10.21273/hortsci.34.3.471f.
Testo completoAbstract (sommario):
The objectives of this study were to characterize the quality and maturity changes of nectarine (Prunus persica var. Nectarina) fruit cvs. Aurelio and Early May during maturation and ripening and to identify harvest maturity indices. After fruit set, 250 fruit of similar diameter and tree position were tagged to follow maturation and ripening on the tree. During commercial harvest, 48 fruit were ramdomly harvested every 2 to 3 days. Ethylene evolution rate (EER) at 20 °C, fresh weight, and peel ground and cover color (L*, a*, b*, C* and Hue value) were measured on all 48 fruit. Flesh color, firmness at several fruit points, soluble solids (SS), pH, titratable acidity (TA) and SS: TA ratio were measured only to 24 fruit, and the rest were held for up to 7 days at 20 °C as a ripening period to measure the same parameters mentioned above. Pearson correlation coefficients were determined between variables to explore possible harvest maturity indices. The most significant changes occurred in EER, fruit firmness, and peel ground color (a* and hue value). For `Aurelio' nectarines the highest correlations (P < 0.001) were obtained between logEER-tip firmness (r = -0.69), tip firmness-a* ground color (r = -0.66) and, tip firmness-hue ground color (r = -0.67). No important correlations (r > 0.60) were found for `Early May' nectarines. It was also found that fruit softening varies according to the point of measurement in the fruit depending on the cultivar.
33
Andersen, P. C., W. B. Sherman e R. H. Sharpe. "`Sundollar' Nectarine". HortScience 25, n. 4 (aprile 1990): 486. http://dx.doi.org/10.21273/hortsci.25.4.486.
Testo completo
34
Layne, Richard E. C. "`Harblaze' Nectarine". HortScience 26, n. 4 (aprile 1991): 425–27. http://dx.doi.org/10.21273/hortsci.26.4.425.
Testo completo
35
Sherman, W. B., P. M. Lyrene e F. G. Gmitter. "`Sunblaze' Nectarine". HortScience 26, n. 4 (aprile 1991): 428–29. http://dx.doi.org/10.21273/hortsci.26.4.428.
Testo completo
36
Scorza, Ralph, Harold W. Fogle e L. E. Gilreath. "‘Earliscarlet’ Nectarine". HortScience 23, n. 5 (ottobre 1988): 934–35. http://dx.doi.org/10.21273/hortsci.23.5.934.
Testo completoAbstract (sommario):
Abstract ‘Earliscarlet’ nectarine [Prunus persica (L.) Batsch] was released in Apr. 1985 because of its attractiveness, high quality, and early season of ripening, a season when relatively few high quality nectarine cultivars for the eastern United States are available.
37
Jun, Ji Hae, Jung Hyun Kwon, Eun Young Nam, Kyeong Ho Chung, Ik Koo Yun, Seok Kyu Yun, Yong Bum Kwack, Sung Jong Kim e Sang Jo Kang. "‘Hahong’ Nectarine". HortScience 49, n. 1 (gennaio 2014): 98–100. http://dx.doi.org/10.21273/hortsci.49.1.98.
Testo completo
38
Worthington, Margaret, e John R. Clark. "‘Effie’ Nectarine". HortScience 53, n. 6 (giugno 2018): 897–901. http://dx.doi.org/10.21273/hortsci12970-18.
Testo completo
39
Krewer, Gerard, Thomas Beckman e Wayne Sherman. "`Sunsplash' Nectarine". HortScience 29, n. 4 (aprile 1994): 339–40. http://dx.doi.org/10.21273/hortsci.29.4.339.
Testo completo
40
Sherman, W. B., P. C. Andersen e P. M. Lyrene. "`Sunraycer' Nectarine". HortScience 30, n. 1 (febbraio 1995): 154. http://dx.doi.org/10.21273/hortsci.30.1.154.
Testo completo
41
Sherman, W. B., P. C. Andersen e P. M. Lyrene. "`Sunmist' Nectarine". HortScience 30, n. 1 (febbraio 1995): 155. http://dx.doi.org/10.21273/hortsci.30.1.155.
Testo completo
42
Andersen, Peter C., e Wayne B. Sherman. "`Suncoast' Nectarine". HortScience 30, n. 2 (aprile 1995): 383–84. http://dx.doi.org/10.21273/hortsci.30.2.383.
Testo completo
43
Perkins-Veazie, P., J. K. Collins e J. R. Clark. "Sensory and Storage Evaluation of Nectarine and White Peach Breeding Lines". HortScience 33, n. 4 (luglio 1998): 605c—605. http://dx.doi.org/10.21273/hortsci.33.4.605c.
Testo completoAbstract (sommario):
Promising white peach and nectarine selections, many with nonmelting flesh, from the Univ. of Arkansas breeding program were evaluated for fruit quality and flavor. About 20 kg of fruit, consisting of mature ripe and ripe stages, were harvested from 4- to 7-year-old trees in Arkansas and transported to Lane, Okla. Fruit were divided into two boxes per selection. One box was held at 5 °C for 8 days, then transferred to 20 °C for 4 days to induce chilling injury and was evaluated for storage quality. The other box was held at 20 °C for 4 days and fruit used for taste panels. Of the 14 nectarine and 12 white peach selections evaluated, one nectarine and four white peach selections had slight chilling injury. Flesh firmness of selections after storage ranged from 6 to 50 N. Taste panelist scores indicated that sweetness was associated with peach flavor in both nectarines and white peaches and that overall acceptability was dependent on sweetness, peach flavor, and low tartness. Ten of the white peach selections were equal to or better in overall acceptability compared to `Summer Pearl' and `Carolina Belle' cultivars included in the study. Panelists did not consider firm texture to be detrimental to overall acceptability. Results indicate that many of the breeding lines used in this study had fruit equal to or better than currently available cultivars in storage life, firmness, and sweetness.
44
Lirong, W., Z. Gengrui, F. Weichao, C. Ke e C. Changwen. "Comparison of heritable pleiotropic effects of the glabrous and flat shape traits of peach". Canadian Journal of Plant Science 90, n. 3 (1 maggio 2010): 367–70. http://dx.doi.org/10.4141/cjps09111.
Testo completoAbstract (sommario):
The genetic variants of peach to nectarine and of round to flat fruit shape are associated with broad heritable pleiotropic effects. In the present study, 216 individuals of four cross families were compared for fruit weight and soluble sugar content (SSC) to identify their effects. Peach fruit weight was increased by 42.7, 23.0 and 125.0% and peach fruit SSC was decreased by 14.7, 7.3 and 24.7% compared with nectarine, flat peach and flat-nectarine, respectively. The weight decrease and the SSC increase in flat-nectarine were about equal to the sum of those for nectarine and flat peach. The additive effect of the glabrous and flat shape traits on fruit weight and SSC made the flat-nectarine extremely small, but high in SSC.Key words: Peach, pleiotropic effects, glabrous trait, flat shape trait
45
Scalisi, Alessio, Mark G. O’Connell, Muhammad S. Islam e Ian Goodwin. "A Fruit Colour Development Index (CDI) to Support Harvest Time Decisions in Peach and Nectarine Orchards". Horticulturae 8, n. 5 (19 maggio 2022): 459. http://dx.doi.org/10.3390/horticulturae8050459.
Testo completoAbstract (sommario):
Fruit skin colour is one of the most important visual fruit quality parameters driving consumer preferences. Proximal sensors such as machine vision cameras can be used to detect skin colour in fruit visible in collected images, but their accuracy in variable orchard light conditions remains a practical challenge. This work aimed to derive a new fruit skin colour attribute—namely a Colour Development Index (CDI), ranging from 0 to 1, that intuitively increases as fruit becomes redder—to assess colour development in peach and nectarine fruit skin. CDI measurements were generated from high-resolution images collected on both east and west sides of the canopies of three peach and one nectarine cultivars using the commercial mobile platform Cartographer (Green Atlas). Fruit colour (RGB values) was extracted from the central pixels of detected fruit and converted into a CDI. The repeatability of CDI measurements under different light environments was tested by scanning orchards at different times of the day. The effects of cultivar and canopy side on CDI were also determined. CDI data was related to the index of absorbance difference (IAD)—an index of chlorophyll degradation that was correlated with ethylene emission—and its response to time from harvest was modelled. The CDI was only significantly altered when measurements were taken in the middle of the morning or in the middle of the afternoon, when the presence of the sun in the image caused significant alteration of the image brightness. The CDI was tightly related to IAD, and CDI values plateaued (0.833 ± 0.009) at IAD ≤ 1.20 (climacteric onset) in ‘Majestic Pearl’ nectarine, suggesting that CDI thresholds show potential to be used for harvest time decisions and to support logistics. In order to obtain comparable CDI datasets to study colour development or forecast harvest time, it is recommended to scan peach and nectarine orchards at night, in the early morning, solar noon, or late afternoon. This study found that the CDI can serve as a standardised and objective skin colour index for peaches and nectarines.
46
Smykov, Anatoly, Evgeny Shoferistov, Vadim Korzin, Natalya Mesyats e Nikita Saplev. "Promising directions in the selection of peach, apricot and nectarine". E3S Web of Conferences 254 (2021): 01010. http://dx.doi.org/10.1051/e3sconf/202125401010.
Testo completoAbstract (sommario):
The collection of stone fruit crops (peach, apricot and nectarine) was analyzed in accordance with their belonging to certain ecological-geographical groups and ecotypes. The most valuable characteristics were determined, sources of economically valuable properties were identified, and included in crossbreeding combinations for intraspecific and interspecific hybridization. Methods of radiation and chemical mutagenesis were used in the selection of peach and apricot. New genotypes with different levels of susceptibility to common diseases have been created. As a result of breeding, new varieties of stone fruit crops selected by NBG were introduced into the Register of Plant Varieties of the Russian Federation: 28 peaches, 3 nectarines, 15 apricots.
47
Byrne, David H., e Terry A. Bacon. "Founding Parents of Low-Chill Peaches". HortScience 31, n. 4 (agosto 1996): 592c—592. http://dx.doi.org/10.21273/hortsci.31.4.592c.
Testo completoAbstract (sommario):
A computer program was developed to calculate the percent contribution of the founding parents for any given peach or nectarine (Prunus persica) cultivar. The founding parents used most frequently for three low-chill (0 to 500 chill units) peach and nectarine breeding programs (Florida and Pelotas and Campinas, Brazil) were determined. The Florida program used several low-chill honey type peaches (`Hawaiian', `Okinawa') as a source of low chilling and then did extensive crossing with higher quality cultivars developed mainly in the northeastern United States. About 50% of the background of the Brazilian peach releases consists of local selections that were originally brought by the Portuguese explorers. Although each of the Brazilian programs used local peach materials, the local peaches used by each program are different. In addition, the program at Pelotas used germplasm from the Georgia–Florida and New Jersey breeding programs and the Campinas program used `Jewel' (honey peach) and several Florida nectarines (`Sunlite', `Sunred') in their development work. The founding parents among these three programs, although there is some common parentage, are different, and the intercrossing of materials from the various programs would be a useful approach to create more diversity in this germplasm.
48
Baugher, Tara Auxt, e Stephen S. Miller. "Growth Suppression as a Control for Nectarine Pox". HortScience 26, n. 10 (ottobre 1991): 1268–70. http://dx.doi.org/10.21273/hortsci.26.10.1268.
Testo completoAbstract (sommario):
A 2-year study was designed to test the effect of four growth-suppressing treatments on the incidence of nectarine [Prunus persica (L.) Batsch] pox, nectarine fruit quality, and the growth and nutritional status of nectarine trees. Root pruning was the only treatment that significantly reduced the incidence of nectarine pox. The percentage of red surface was increased by root pruning, foliar-applied paclobutrazol, and girdling. Root pruning and paclobutrazol suppressed extension shoot growth. Root pruning decreased fruit N, P, K, Mg, Mu, Fe, B, and Zn levels and increased fruit Ca. Results of the study support earlier observations that nectarine pox is associated with excessive shoot growth, excessive levels of fruit N and K, and low levels of fruit Ca. Chemical name used: Beta-[(4-chlorophenyl) methyl] -alpha-(1,1-dimethylethyl)-l-H-1,2,4 -triazole-l-ethanol (paclobutrazol).
49
Abilfazova, Yu S. "Adaptability of variety and rootstock combinations of peach and nectarine in the Russia subtropics". Вестник российской сельскохозяйственной науки, n. 5 (15 dicembre 2023): 57–60. http://dx.doi.org/10.31857/2500-2082/2023/5/57-60.
Testo completoAbstract (sommario):
The article presents the results of research into a collection of peaches and nectarines cultivated at the Federal Scientific Research Center of the Russian Academy of Sciences in Sochi. The experiment was conducted in open ground, plot area is 0.5 hectares, planting pattern is 5x2.5m, 5x2, 5x1.5m. In 2019, the Center’s assortment was replenished with 28 variety-rootstock combinations of peach and nectarine based on eight varieties (Pamyat Simirenko, Redhaven, Zolotoy Yubiley, Osenniy Rumyanets, Obilny, Orion, Pyatnitsa 13, Silver Roma) of different ripening periods on four clonal rootstocks: Kuban 86, BP, Best, VVA. The physiological and biochemical characteristics of variety-rootstock combinations of peach and nectarine, resistant to abiotic factors in the humid subtropics of Russia, have been studied. The object of study is peach leaves. Physiological analyzes were carried out in the plant physiology and biochemistry department using classical methods: water deficiency of peach leaves was determined according to Pochinok; tissue hydration - according to Gunar; water holding capacity - according to Arland; dry matter - by drying in a drying cabinet to constant weight. Leaves were collected from June to August. Agricultural technology is generally accepted for peach culture. Brown forest soils. It has been established that the best varieties of peach and nectarine in terms of ability to retain water during the dry period are: Redhaven (AP), Pyatnitsa 13 (AP), Pyatnitsa 13 (Best), Pyatnitsa 13 (BP) with low water deficit (11.06-4. 78%) and high water-retaining system of leaves (64-76%). They were distinguished by an increase in the turgor of leaf tissues to 66.33-69.27%, which is considered a sign of plant adaptability to disturbances in the water-thermal regime.
50
Okie, W. R. "Three New Peaches and a Nectarine for the Southeastern United States". HortScience 33, n. 3 (giugno 1998): 463e—463. http://dx.doi.org/10.21273/hortsci.33.3.463e.
Testo completoAbstract (sommario):
Four new varieties have been released from the USDA–ARS Stone Fruit Breeding program located in central Georgia. All are adapted to the humid Southeastern U.S. climate. `Rubyprince' is an early yellow-fleshed peach with excellent size, firmness, and color. The slow-softening fruit ripens in early June at Byron, about with `Dixired', but is slightly lower chilling (about 800 h below 45 °F). `Blazeprince' is a very firm yellow-fleshed peach with a solid red blush that ripens in late mid-season between `Harvester' and `Redglobe'. It is susceptible to bacterial spot disease similar to `O'Henry'. It requires about 850 chill hours. `Southern Pearl' is a large white-fleshed, mid-season peach with very good acid flavor and medium firmness. It ripens about with `Harvester' or `Redhaven'. Chilling requirement is only about 650 h, similar to `Springcrest'. `Juneprincess' nectarine ripens in about the same season as `Southern Pearl' and produces large, attractive, firm fruit that is less prone to rain cracking than many nectarines. Skin color is bright red, typical of California nectarines, with yellow flesh. Chilling requirement is about 850 h.