Genetic linkage mapping for molecular dissection of chilling requirement and budbreak in apricot (Prunus armeniaca L.)

Genome Génome / Conseil National De Recherches Canada
Bode A OlukoluDoron Holland

Abstract

Commercial production of apricot is severely affected by sensitivity to climatic conditions, an adaptive feature essential for cycling between vegetative or floral growth and dormancy. Yield losses are due to late winter or early spring frosts and inhibited vegetative or floral growth caused by unfulfilled chilling requirement (CR). Two apricot cultivars, Perfection and A.1740, were selected for high and low CR, respectively, to develop a mapping population of F1 individuals using a two-way pseudo-testcross mapping strategy. High-density male and female maps were constructed using, respectively, 655 and 592 markers (SSR and AFLP) spanning 550.6 and 454.9 cM with average marker intervals of 0.84 and 0.77 cM. CR was evaluated in two seasons on potted trees forced to break buds after cold treatments ranging from 100 to 900 h. A total of 12 putative CR quantitative trait loci (QTLs) were detected on six linkage groups using composite interval mapping and a simultaneous multiple regression fit. QTL main effects of additive and additive x additive interactions accounted for 58.5% +/- 6.7% and 66.1% +/- 5.8% of the total phenotypic variance in the Perfection and A.1740 maps, respectively. We report two apricot high-density maps and QT...Continue Reading

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Citations

Dec 16, 2011·Nature Reviews. Cancer·Brian KeithM Celeste Simon
Dec 22, 2009·Molecular BioSystems·Abeer FaddaKathleen Marchal
Apr 18, 2013·Molecular BioSystems·Dries De MaeyerKathleen Marchal
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Jan 29, 2019·Frontiers in Plant Science·Vítor da Silveira FalavignaFernando Andrés
Jan 29, 2020·Ecology and Evolution·Ting ShiZhihong Gao

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