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QTug.sau-3B Is a Major Quantitative Trait Locus for Wheat Hexaploidization

By Ming Hao, Jiangtao Luo, Deying Zeng, Li Zhang, Shunzong Ning, Zhongwei Yuan, Zehong Yan, Huaigang Zhang, Youliang Zheng, Catherine Feuillet, Frédéric Choulet, Yang Yen, Lianquan Zhang and Dengcai Liu

Abstract

Meiotic nonreduction resulting in unreduced gametes is thought to be the predominant mechanism underlying allopolyploid formation in plants. Until now, however, its genetic base was largely unknown. The allohexaploid crop common wheat (Triticum aestivum L.), which originated from hybrids of T. turgidum L. with Aegilops tauschii Cosson, provides a model to address this issue. Our observations of meiosis in pollen mother cells from T. turgidumxAe. tauschii hybrids indicated that first division restitution, which exhibited prolonged cell division during meiosis I, was responsible for unreduced gamete formation. A major quantitative trait locus (QTL) for this trait, named QTug.sau-3B, was detected on chromosome 3B in two T. turgidumxAe. tauschii haploid populations. This QTL is situated between markers Xgwm285 and Xcfp1012 and covered a genetic distance of 1 cM in one population. QTug.sau-3B is a haploid-dependent QTL because it was not detected in doubled haploid populations. Comparative genome analysis indicated that this QTL was close to Ttam-3B, a collinear homolog of tam in wheat. Although the relationship between QTug.sau-3B and Ttam requires further study, high frequencies of unreduced gametes may be related to reduced expression of Ttam in wheat

Topics: allopolyploidy, CYCA1, 2/TAM, unreduced gametes, Triticum aestivum, first division restitution, [SDV]Life Sciences [q-bio], [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, [SDE]Environmental Sciences
Publisher: 'Genetics Society of America'
Year: 2014
DOI identifier: 10.1534/g3.114.013078
OAI identifier: oai:HAL:hal-02633053v1
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