AUTHOR=Dale Zhang , Jie He , Luyu Huang , Cancan Zhang , Yun Zhou , Yarui Su , Suoping Li 

TITLE=An Advanced Backcross Population through Synthetic Octaploid Wheat as a “Bridge”: Development and QTL Detection for Seed Dormancy

JOURNAL=Frontiers in Plant Science

VOLUME=8

YEAR=2017

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2017.02123

DOI=10.3389/fpls.2017.02123

ISSN=1664-462X

ABSTRACT=<p>The seed dormancy characteristic is regarded as one of the most critical factors for pre-harvest sprouting (PHS) resistance. As a wild wheat relative species, <italic>Aegilops tauschii</italic> is a potential genetic resource for improving common wheat. In this study, an advanced backcross population (201 strains) containing only <italic>Ae. tauschii</italic> segments was developed by means of synthetic octaploid wheat (hexaploid wheat Zhoumai 18 × <italic>Ae. tauschii</italic> T093). Subsequently, seed dormancy rate (Dor) in the advanced backcross population was evaluated on the day 3, 5 and 7, in which 2 major QTLs (<italic>QDor-2D</italic> and <italic>QDor-3D</italic>) were observed on chromosomes 2D and 3D with phenotypic variance explained values (PVEs) of 10.25 and 20.40%, respectively. Further investigation revealed significant correlation between <italic>QDor-3D</italic> and <italic>Tamyb10</italic> gene, while no association was found between the former and <italic>TaVp1</italic> gene, implying that <italic>QDor-3D</italic> site could be of closer position to <italic>Tamyb10</italic>. The obtained quantitative trait locus sites (QTLs) in this work could be applied to develop wheat cultivars with PHS resistance.</p>