Abstract: Phosphorus deficiency is a major yield-limiting factor in crop production;studies about low phosphor-us tolerance will provide important theoretical guiding for rice resistant breeding.In this study, a set of chromosome segment substitution lines carrying Nipponbare segments in 9311 background was used to identify QTLs for root e-longation traits related to phosphorus deficiency at rice seedling stage under solution conditions.A total of nine QTLs for three root elongation traits were mapped, including two QTLs under normal phosphorus level, four QTLs under low phosphorus stress level, and three relative trait QTLs.Of them,additive effect values of five QTLs were negative, and derived from the low-phosphorus-sensitive parent Nipponbare.Additional four QTLs were of positive additive effect values and their effects were derived from the low-phosphorus-tolerance parent 9311.One common QTL loca-ted on rice chromosome 5 was detected between the root elongation trait under low phosphorus level and relative trait,which was not reported previously.The results will provide information for identification of genetic loci associ-ated with low phosphorus tolerance and for rice marker-assisted breeding.

Key words: ORyza sativa L., PhosphoRus-deficiency stRess, Root elongation, ChRomosome segment substitution lines, QTL

CLC Number: 

• S511