RICE SCIENCE ›› 2011, Vol. 18 ›› Issue (1): 23-28 .

• Research Paper • Previous Articles     Next Articles

Mapping QTLs for Drought Tolerance at Seedling Stage in Rice Using Doubled Haploid Population

XU Qun, YUAN Xiao-ping, YU Han-yong, WANG Yi-ping, TANG Sheng-xiang, WEI Xing-hua   

  1. State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China
  • Received:2010-09-25 Revised:2010-12-20 Online:2011-03-28 Published:2011-07-11
  • Contact: WEI Xing-hua
  • Supported by:

    This work was partly supported by the Key Scientific and Technological Project for Agriculture in Zhejiang Province, China (Grant No. 2007C12073), and the Basic Research Budget of China National Rice Research Institute (Grant No. 2009RG001-3).

Abstract: QTLs for drought tolerance at the rice seedling stage were analyzed using a doubled haploid (DH) population consisted of 251 lines from the cross between a japonica parent Maybelle and an indica parent Baiyeqiu. A genetic linkage map with 226 SSR marker loci was constructed. Single-locus analysis following composite interval mapping (CIM) detected a total of five QTLs located on five different chromosomes of rice. Four QTLs were also detected following two-locus analysis, resolving two pairs of epistatic QTLs (E-QTLs) with positive and additive genetic effects. The results indicated that the alleles from the parent Baiyeqiu contributed DH population to improve drought tolerance at the seedling stage.

Key words: rice, drought tolerance, doubled haploid population, quantitative trait locus