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Comparative Study
. 2012 Nov;109(5):280-92.
doi: 10.1038/hdy.2012.38. Epub 2012 Jul 25.

Comparison of the genetic determinism of two key phenological traits, flowering and maturity dates, in three Prunus species: peach, apricot and sweet cherry

Affiliations
Comparative Study

Comparison of the genetic determinism of two key phenological traits, flowering and maturity dates, in three Prunus species: peach, apricot and sweet cherry

E Dirlewanger et al. Heredity (Edinb). 2012 Nov.

Abstract

The present study investigates the genetic determinism of flowering and maturity dates, two traits highly affected by global climate change. Flowering and maturity dates were evaluated on five progenies from three Prunus species, peach, apricot and sweet cherry, during 3-8 years. Quantitative trait locus (QTL) detection was performed separately for each year and also by integrating data from all years together. High heritability estimates were obtained for flowering and maturity dates. Several QTLs for flowering and maturity dates were highly stable, detected each year of evaluation, suggesting that they were not affected by climatic variations. For flowering date, major QTLs were detected on linkage groups (LG) 4 for apricot and sweet cherry and on LG6 for peach. QTLs were identified on LG2, LG3, LG4 and LG7 for the three species. For maturity date, a major QTL was detected on LG4 in the three species. Using the peach genome sequence data, candidate genes underlying the major QTLs on LG4 and LG6 were investigated and key genes were identified. Our results provide a basis for the identification of genes involved in flowering and maturity dates that could be used to develop cultivar ideotypes adapted to future climatic conditions.

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Figures

Figure 1
Figure 1
Location of QTLs controlling flowering date in four progenies: two peach (J × F, BC2), one apricot G × M and one sweet cherry R × L. Only results using muti-year analyses from MultiQTL are indicated. Common markers between linkage groups are in bold, those common between adjacent linkage groups are linked by lines. Confidence intervals estimated on 1000 bootstrape are represented as solid bars.
Figure 2
Figure 2
Location of QTLs controlling maturity date on LG4 detected in peach, apricot and sweet cherry by using the multiple environment function of MultiQTL. Common markers between linkage groups are in bold, those common between adjacent linkage groups are linked by lines. Solid bars indicate the confidence intervals estimated on 1000 bootstrap samples. QTLs controlling maturity date in the peach ‘Bolero' and ‘Contender × Ambra' F2 progeny detected in 2007 and 2008 are also indicated (Eduardo et al., 2011).

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