QTL Analysis for Plant Height and Heading Date in Rice under Two Nitrogen Levels

Abstract

A recombinant inbred line(RIL),derived from a super hybrid rice cross of XQZB/R9308 and its genetic linkage map were used to identify QTLs through Windows QTL Cartographer 2.5 for plant height(PH) and heading date(HD) under low and normal nitrogen conditions in rice.Nine QTLs for PH and eight QTLs for HD were detected under two nitrogen levels,four QTLs for trait differences of PH and HD were detected between the two environments,explaining 5.68-18.40% of phenotypic variation.The pleiotropic QTLs influencing PH and HD were detected near RM5436 on chromosome 7 and in the interval RM5556-RM310 on chromosome 8,which showed high contribution of genetic effects and the position alleles were all originated from R9308.These QTLs are favorable for marker-assisted selection.One QTL for HD difference and one QTL for PH difference were detected in the interval RM5916-RM166 on chromosome 2 and in the interval RM2366-RM5767 on chromosome 8,which were considered to directly contribute to nitrogen use efficiency in rice.