Inheritance of floral abortion in progenies of "Stark Early Orange" apricot

In apricot flower bud abortion is a main component of varietal adaptability under climatic conditions of French and Italian growing areas. The 'Stark Early Orange' (SEO) variety is mainly used in breeding programs as genetic resource for resistance to plum pox virus. Despite very high flower bud initiation on lateral shoots, 'SEO' is unfruitful under Mediterranean growing areas because of excessive abortion. Thus a preliminary study of the inheritance of floral abortion was carried out through the observation of three segregant progenies obtained from crossing between 'SEO' and three fruitful cultivars. Each progeny was evaluated during at least two consecutive years using the same methodology in France and in Italy. Preliminary and similar results support the hypothesis that floral abortion trait is transmitted through a polygenic control. Moreover the high susceptibility of 'SEO' regarding floral abortion could be transmitted with an important dominance effect, regardless of its use as male or female paren

Inheritance of floral abortion in apricot tree

In apricot flower bud abortion is a main component of varietal adaptability under climatic conditions of French and Italian growing areas. The 'Stark Early Orange' (SEO) variety is mainly used in breeding programs as genetic resource for resistance to plum pox virus. Despite very high flower bud initiation on lateral shoots, 'SEO' is unfruitful under Mediterranean growing areas because of excessive abortion. Thus a preliminary study of the inheritance of floral abortion was carried out through the observation of three segregant progenies obtained from crossing between 'SEO' and three fruitful cultivars. Each progeny was evaluated during at least two consecutive years using the same methodology in France and in Italy. Preliminary and similar results support the hypothesis that floral abortion trait is transmitted through a polygenic control. Moreover the high susceptibility of 'SEO' regarding floral abortion could be transmitted with an important dominance effect, regardless of its use as male or female paren

Deciphering the genetic determinism of bud phenology in apple progenies: a new insight into chilling and heat requirement effects on flowering dates and positional candidate genes

The present study investigates the genetic determinism of bud phenological traits using two segregating F1 apple (Malus x domestica) progenies. Phenological trait variability was dissected into genetic and climatic components using mixed linear modeling, and estimated best linear unbiased predictors were used for quantitative trait locus (QTL) detection. For flowering dates, year effects were decomposed into chilling and heat requirements based on a previously developed model. QTL analysis permitted the identification of two major and population-specific genomic regions on LG08 and LG09. Both ‘chilling requirement’ and ‘heat requirement’ periods influenced flowering dates, although their relative impact was dependent on the genetic background. Using the apple genome sequence data, putative candidate genes underlying one major QTL were investigated. Numerous key genes involved in cell cycle control were identified in clusters within the confidence interval of the major QTL on LG09. Our results contribute towards a better understanding of the interaction between QTLs and climatic conditions, and provide a basis for the identification of genes involved in bud growth resumption

Inheritance of floral abortion in apricot tree

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Inheritance of floral necrosis trait in apricot tree

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Analysis of morphological and architectural traits of apricot varieties grown in different environmental conditions

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Analysis of morphological and architectural traits of apricot cultivars grown in different environmental conditions

National audienc

Studying inheritance of morphological and architectural traits on fruit trees: constraints and perspectives of INRA research programs

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