Inheritance and QTL analysis of chilling and heat requirements for flowering in an interspecific almond x peach (Texas x Earlygold) F2 population
Cantin, Celia M. (Institut de Recerca i Tecnologia Agroalimentàries)
Wang, Xin-Wei (Chinese Academy of Agricultural Sciences. Zhengzhou Fruit Research Institute)
Almira, Maria Jose (Universitat Autònoma de Barcelona)
Arús i Gorina, Pere (Centre de Recerca en Agrigenòmica)
Eduardo, Iban (Centre de Recerca en Agrigenòmica)

Fecha:	2020
Resumen:	Blooming in temperate fruit species is triggered by chilling and heat requirements (CR and HR), with a wide range of requirements within the same species. CR for flower bud dormancy release has become a limiting factor for geographical adaptation of fruit trees in warmer regions. The present study investigated the genetic basis of CR and HR to break dormancy and flowering time (FT) in an almond x peach F2 progeny. FT, HR and CR were evaluated over two consecutive years (2015/2016 and 2016/2017). Seven out of the eight identified quantitative trait loci (QTLs) were found in both periods of analysis. They affected eight traits, and included a consistent QTL for breaking dormancy, CR and HR. Two of them, affecting FT and HR for FT (GDHF), colocalized in G1, and the remaining QTLs, affecting chilling and heat requirements, both influenced by dormancy breaking (DB), were located in G6. These results indicate that factors not related to DB affect flowering time in this population. Implications of the results in peach breeding are discussed.
Ayudas:	Ministerio de Economía y Competitividad AGL2015-68329-R Ministerio de Economía y Competitividad RTA2015-00050-00-00 Ministerio de Economía y Competitividad SEV-2015-0533
Nota:	Altres ajuts: Generalitat de Catalunya/CERCA programme
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Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Chilling requirements ; Heat requirements ; Peach ; Flowering
Publicado en:	Euphytica, Vol. 216, issue 3 (March 2020) , art. 51, ISSN 1573-5060

DOI: 10.1007/s10681-020-02588-9

Postprint 41 p, 1.8 MB

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