Identification of phosphorus high efficiency germplasm and QTL mapping in Brassica napus

摘要

Phosphorus (P) is an essential mineral nutrient for plant growth, and Brassica napus is an important oil crops which is sensitive to P deficiency. In this study, a P-efficient cultivar "97081" and a P-inefficient cultivar "97009" were obtained by screening 243 cultivars of Brassica napus at seedling stage and whole growth period. A genetic linkage map with 23 linkage groups was constructed using SSR and AFLP markers in a F_2-3 population derived from a cross between "97081" and "97009" , and three QTLs , DSYl, DSY2, DSY3, which significant related to seed yield at P deficiency and one QTL of P efficiency coefficient (PECM) were detected in genome-wide QTL analyses with WinCarter2.0 software. The results suggested that multigenes are involved in uptake and utilization of P in Brassica napus, which respond to P deficiency stress and make sure more biomass and seed yield under the condition of P deficiency.