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Conferring resistance to pre-harvest sprouting in durum wheat by a QTL identified in Triticum spelta

Counts:1565DateTime:2017-01-09 11:27:41 Source: Wheat Research Institute

Yujiao Liu12, Yaxi Liu1, Yong Zhou1, Charlene Wight2, Zhien Pu1, Pengfei Qi1, Qiantao Jiang1, Mei Deng1, Zaoxia Wang1, Yuming Wei1, Wenguang Cao2, Dengcai Liu1, Youliang Zheng1, Chunji Liu3, Judith Frégeau-Reid2, Jirui Wang1*

1.Triticeae Research InstituteSichuan Agricultural UniversityChengduChina
2.Agriculture and Agri-Food CanadaEastern Cereal and Oilseed Research CentreOttawaCanada
3.CSIRO Agriculture FlagshipSt LuciaAustralia
*. Email author


Cite this article as:

Liu, Y., Liu, Y., Zhou, Y. et al. Euphytica (2017) 213: 19. doi:10.1007/s10681-016-1796-x

Abstract
Pre-harvest sprouting (PHS) causes significant yield loss and degrade the end-use quality of wheat, especially in regions with prolonged wet weather during the harvesting season. Unfortunately, the gene pool of Triticum durum (tetraploid durum wheat) has narrow genetic base for PHS resistance. Therefore, finding out new genetic resources from other wheat species to develop PHS resistance in durum wheat is of importance. A major PHS resistance QTL, Qphs.sicau-3B.1, was mapped on chromosome 3BL in a recombinant inbred line population derived from ‘CSCR6’ (Triticum spelta), a PHS resistant hexaploid wheat and ‘Lang’, a PHS susceptible Australian hexaploid wheat cultivar. This QTL, Qphs.sicau-3B.1, is positioned between DArT marker wPt-3107 and wPt-6785. Two SCAR markers (Ph3B.1 and Ph3B.2) were developed to track this major QTL and were used to assay a BC2F8 tetraploid population derived from a cross between the durum wheat ‘Bellaroi’ (PHS susceptible) and ‘CSCR6’ (PHS resistant). Phenotypic assay and marker-assisted selection revealed five stable tetraploid lines were highly PHS resistant. This study has successfully established that PHS-resistance QTL from hexaploid wheat could be efficiently introgressed into tetraploid durum wheat. This tetraploid wheat germplasm could be useful in developing PHS resistant durum cultivars with higher yield and good end-use quality.

Keywords

Durum wheat Pre-harvest sprouting (PHS) Quantitative trait locus/loci (QTL) Marker-assisted selection (MAS) Quality breeding


Yujiao Liu and Yaxi Liu have contributed equally for this work.