QTL mapping and analysis of QTL X nitrogen interactions for some yield components in Brassica napus L.

摘要

Nitrogen (N) plays a critical role in crop production. Nowadays, it is possible to detect quantitative trait loci (QTL), as well as their effects and positions on cnromosomes, by new molecular ana bio metrical methods. A doubled haploid rapeseed population of 142 lines from the doubled winter rapeseed cultivars Mansholt's and Samourai. and a framework map derived from an RFLP map were used for the analysis of QTL and their interactions with N in terms of some yield components obtained from field trials in Brsssica nspus L. The interactions between traits and N were determined by variance analysis. Two QTL for number of seeds per pod, and four QTL for thousand seed weight were mapped at N_0 (0 kg/ha N). Three QTL for pod length, two QTL for numberof seeds per pod and three QTL for thousand seed weight were mapped at N_1 (240 kg/ha N). All the QTL of N_0 and N_1, were mapped by analysing QTL X N interactions for all traits. Although it was found that there was no interaction between the mapped QTLand N the results here can be used to improve the N-use efficiency and seed yield of Brassica napus.