QTLmapping for seedling traits associated with low‐nitrogen tolerance using a set of advanced backcross introgression lines of rice

• DOI: 10.1111/pbr.12123
• Publication Date: 2013-12-26T12:52:42Z
• Authors: Chun‐Fang Zhao; Li‐Hui Zhou; Ya‐Dong Zhang; Zhen Zhu; Tao Chen; Qing‐Yong Zhao; Shu Yao; Xin Yu; Cai‐Lin Wang
• Keywords: 2. Zero hunger; 0106 biological sciences; 01 natural sciences

AbstractNitrogen (N) deficiency is a major yield‐limiting factor in rice production. The objective of this study was to identify putativeQTLs for low‐N stress tolerance of rice, using an advanced backcross population derived from crosses between anindicacultivar ‘93‐11’ and ajaponicacultivar ‘Nipponbare’ and genotyped at 250 marker loci. Plant height, maximum root length, root dry weight, shoot dry weight and plant dry weight under two N conditions and their relative traits were used to evaluate low‐N tolerance at the seedling stage. A total of 44QTLs were identified on chromosomes 1, 2, 3, 4, 5, 6, 8 and 9. Eight intervals on five chromosomes were identified to harbour multipleQTLs, suggesting pleiotropism or multigenic effects according to the contributor of alleles. SomeQTLclusters were found in the nearby regions of genes associated with N recycling in rice, indicating that the key N metabolism genes might have effects on the expression ofQTLs. Several uniqueQTLs for relative traits were detected, which suggested the specific genetic basis of relative performance.