QTL detection for nitrogen use efficiency in winter wheat.

摘要

In the European context of growing concerns for the environment and cereal overproduction, there is need for wheat varieties better suited to low-input management systems including a low Nitrogen (N) level. The objective of this study was the identification of chromosome regions which are involved in N use efficiency. The determination of quantitative traits loci (QTL) for grain yield, yield components and N contents was carried out on a doubled haploid lines population derived from the cross betweencv.'Arche' (N stress tolerant) and cv. 'Recital' (N stress susceptible). In 2000 about 220 DH. lines have been studied at four locations and two N levels. The population showed a high variability for all measured characters. The Genotype x N level interaction was generally significant meaning that genotypes reacted differently depending on the N treatment. Results of a detection of the interaction-QTLs (interaction with the N level) will be presented. Most of the QTLs arc localized on the chromosomes 2D and 4B, and co-localized with generalist QTLs. Only the QTLs from the end of the 2B do not co-localize with generalist QTLs.