Identification of quantitative trait loci controlling drought tolerance at seedling stage in Chinese Dongxiang common wild rice (Oryza rufipogon Griff.).
Common wild rice (Oryza rufipogon Griff.) is the ancestor of cultivated rice (O. sativa L.), which has a greater genetic diversity and important traits that remain to be employed in cultivated rice. In this study, a set of introgression lines (BC4F5 and/or BC4F6) carrying various introgressed segments from common wild rice, collected from Dongxiang county, Jiangxi Province, China, in the background of an Indica (O. sativa L. ssp. indica) cultivar, Guichao 2, was used. A total of 12 drought-related quantitative trait loci (QTL) were identified by investigating drought tolerance of introgression lines under 30% PEG treatment at the young seedlings stage. Of these QTLs, the alleles of 4 QTLs on chromosome 2, 6 and 12 from Dongxiang common wild rice were responsible for increased drought tolerance of the introgression lines. In particular, a QTL qSDT12-2, near RM17 on chromosome 12, was consistently detected in different replications, and expressed stably under PEG stress throughout the study. It was also found that the QTLs located on different chromosomes might express at different stages.
Zhou
Shao-Xia
SX
State Key Laboratory of Agrobiotechnology, Department of Plant Genetics and Breeding, China Agricultural University, Beijing.
Tian
Feng
F
Zhu
Zuo-Feng
ZF
Fu
Yong-Cai
YC
Wang
Xiang-Kun
XK
Sun
Chuan-Qing
CQ
D002681:China; D018744:DNA, Plant / Q000032:analysis; D055864:Droughts; D012275:Oryza / Q000235:genetics* / Q000502:physiology; D010641:Phenotype; D040641:Quantitative Trait Loci; D036226:Seedlings / Q000235:genetics*
D018744:DNA, Plant