Abstract
The timing of flowering in perennial plants is crucial for their survival in temperate climates and is regulated by the duration of bud dormancy. Bud dormancy release and bud break depend on the perception of cumulative chilling during endodormancy and heat during the bud development. The objectives of this work were to identify candidate genes involved in dormancy and flowering processes in sweet cherry, their mapping in two mapping progenies ‘Regina’ × ‘Garnet’ and ‘Regina’ × ‘Lapins’, and to select those candidate genes which co-localized with quantitative trait loci (QTLs) associated with temperature requirements for bud dormancy release and flowering. Based on available data on flowering processes in various species, a list of 79 candidate genes was established. The peach and sweet cherry orthologs were identified and primers were designed to amplify sweet cherry candidate gene fragments. Based on the amplified sequences of the three parents of the mapping progenies, SNPs segregations in the progenies were identified. Thirty five candidate genes were genetically mapped in at least one of the two progenies and all were in silico mapped. Co-localization between candidate genes and QTLs associated with temperature requirements and flowering date were identified for the first time in sweet cherry. The allelic composition of the candidate genes located in the major QTL for heat requirements and flowering date located on linkage group 4 have a significant effect on these two traits indicating their potential use for breeding programs in sweet cherry to select new varieties adapted to putative future climatic conditions.
Highlights
The life cycle control of plants is complex, especially for perennial species with repeating cycles under contrasting environments
Starting from a wide list of candidate genes (CGs), we identified and mapped orthologs in sweet cherry and we were able to co-localize a subset of these genes with quantitative trait loci (QTL) for flowering time and chilling and heat requirements
We showed the first co-localization between CGs and QTLs for temperature requirements and flowering date in sweet cherry
Summary
The life cycle control of plants is complex, especially for perennial species with repeating cycles under contrasting environments. This is true for flowering as it is one of the most fundamental and complex developmental processes in plants and needs to be synchronized with climatic conditions especially in temperate regions with alternating well-differentiated. Candidate Genes for Bud Dormancy and Flowering Time in Sweet Cherry changement climatique
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