Identification of salt-tolerance QTL in rice (Oryza sativa L.)

Quantitative trait loci (QTLs) controlling salt-tolerance at the seedling s tage in rice (Oryza sativa L.) were identified by interval mapping (SIM) an d composite interval mapping (CIM) using a doubled haploid population ZJDH and its high resolution genetic linkage map. The population was derived fro m an inter-subspecific cross between an indica variety Zhaiyeqing8 (ZYQ8) a nd a japonica variety Jingxi17 (JX17). Analysis of survival days of seedlin gs treated with 0.7% NaCl revealed that a major salt-tolerance quantitative trait locus (QTL), Std, was present between markers RG612 and C131 on chro mosome 1 when using both MAPMAKER/QTL 1. 1 and PLABQTL 1.0 (SIM). Its allel e which contributes to salt-tolerance was from ZYQ8. In addition, seven mor e QTLs which give additive effect on salt-tolerance are identified when usi ng PLABQTL (CIM), and most of them were from JX17.