فهرست مقالات late frost spring

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  1 - Selection Almond Superior Genotypes Form F1 Segregated Population of ‘Tuono’ × ‘Shokoufe’ Cultivars
  Somayeh Firouzbakht ALI Ebadi Ali Imani Daryoush Davoudi Vahid Abdoosi
  10.22034/jon.2021.1928888.1113
  The primary steps in breeding programs are identifying and selecting superior fruit trees genotypes. This study was conducted to achieve the most productive, self-compatible, and cold tolerated almond [Prunus dulcis (Mill.)D.A.webb] genotypes, by determining genetic var چکیده کامل

  The primary steps in breeding programs are identifying and selecting superior fruit trees genotypes. This study was conducted to achieve the most productive, self-compatible, and cold tolerated almond [Prunus dulcis (Mill.)D.A.webb] genotypes, by determining genetic variability of 103 progenies resulted by crossing ‘Tuono’ and ‘Shokoufe’ during two years, 2016-2017 at Meshkin Abad Horticulture Research Station in Karaj (50.9°E, 35. ° 7521 N, 1245 m height, with moderate and cold climates, shallow, calcareous soils, with a pH = 7) according to almond description (Gulcan, 1985) for selecting superior hybrids. The genetic relationship between selected hybrids was carried out by using genetic correlation. Minimum, maximum, and comparing mean results represented hybrids’ variability. Correlations indicated significant positive and negative variability. 20 components of effective traits justified 77.4% of the total variance. Hybrid separation was carried out by clustering analysis using 20 components. In 10th Euclidean distance, hybrids were separated into 17 groups. Fruit, nut, kernel, productivity, and vigor characteristics were the main factors in grouping clusters, respectively. In the first factor, traits including fruit size (0.70), fruit weight (0.880), fruit length (0.741), fruit width (0.769), fruit thickness (0.722), nut weight (0.872), nut length (0.729), nut width (0.795), nut thickness (0.673), kernel weight (0.849), kernel length (0.635) and kernel width (0.837). In the second factor, there were traits including productivity (0.797), number of nuts per tree (0.925), fruit weight per tree (0.932), and nut weight per tree (0.905). In the third factor, traits such as trunk diameter (0.60), the radius of expansion in two directions north-south (0.755) and east-west (0.804), leaf density (0.60), and growth habit (0.60). These third components could justify about 14%, 7%, and 5% of the total variance. The most variable traits were growth habit, high quality, bearing habit, flowering and leafing time, fruit size; date of harvesting, nut shape and the lowest variable trait was kernel taste. پرونده مقاله
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  2 - Characteristics of Almond Selections in Relation to Late Frost Spring
  Ali imani Yaser Mahamadkhani
  10.22034/jon.2011.515754
  Almond is one of the most important nut crops in Iran. Due to the suitable climatic conditions, Iran is one of the most important growing centers for wild and domesticated species of almond in world. Native genotypes typically are early flowering, due to late spring fro چکیده کامل

  Almond is one of the most important nut crops in Iran. Due to the suitable climatic conditions, Iran is one of the most important growing centers for wild and domesticated species of almond in world. Native genotypes typically are early flowering, due to late spring frost, often; they have been damaged. So frost damage to the flowers and early developing fruits is one of the most limiting factors in the most almond cultivation regions of the world. This study was undertaken to help understand almond response to frost damage at different phenological stages, in order to develop criteria for the selection of cultivars with improved resistance to frost on the basis of field experiment with temperature fall (-4˚C in 21 march 2010) was occurred naturally. In this stage, all early, medium and late flowering almonds damaged, but damage severity was different. Obviously, there was genetic diversity for cold resistant among genotypes and varieties of almond. Frost damage percentage of cultivars and genotypes after frost was measured at least 100 flowers of each cultivar with 3 replications. Results showed that the severity of frost damage was influenced by genotypes of almond and stage of flower bud development and other indices such as leafing stage. After the evaluating the 29 almond selections, based on flowering time and late frost spring resistance, they were divided into high cold resistant; medium cold resistant; low cold resistant and very low cold resistance. Also, it was found that one promising genotypes with high late frost spring resistant was medium flowering. پرونده مقاله