Genetic Diversity Revealed by Chloroplast Genomic Microsatellite Markers in Hexaploid Wheat,Wild Emmer and Aegilops tauschii

ObjectiveThe goal of this study is to analyze the genetic diversity of chloroplast genome among hexaploid wheat populations and their relatives. Method21 SSR markers derived from chloroplast genome of common wheat,are used to measure the genetic diversity among hexaploid wheat populations and their relatives,which include 20 common wheat (Triticum aestivum L.),21 spelt wheat (Triticum spelta L.),20 club wheat (Triticum compactum Host.),10 wild emmer (Triticum dicoccoides),16 Chinese wheat landraces (9 T. tibetanum,3 T. yunnanense and 4 T. petropavlavskyi) and 9 Aegilops tauschii.ResultCompared with common wheat,the genetic variation base of chloroplast genome in spelt and T. tibetanum were more abundant,which can be used to broaden the genetic basis of common wheat. Cluster analysis exhibited that wild emmer had a closer consanguine relationship to hexaploid wheat,as compared to Aegilops tauschi. In addition,it was found that there was a closer genetic relationship in chloroplast genome of common wheat and T. petropavlavskyi,which indicated that T. petropavlavskyi probably derived from the backcross between common wheat and Polish wheat.ConclusionThe genetic variation of chloroplast genome in spelt and T. tibetanum was more abundant than that in common wheat and there were closer genetic relationships between common wheat and T. petropavlavskyi and between hexaploid wheat and emmer.