QTL mapping for seedling traits associated with low-nitrogen tolerance using a set of advanced backcross introgression lines of rice

文献类型: 外文期刊

第一作者: Zhao, Chun-fang

作者: Zhao, Chun-fang;Zhou, Li-hui;Zhang, Ya-dong;Zhu, Zhen;Chen, Tao;Zhao, Qing-yong;Yao, Shu;Yu, Xin;Wang, Cai-lin

作者机构:

关键词: seedling stage;Oryza sativa L.;low-nitrogen tolerance;QTL

期刊名称:PLANT BREEDING ( 影响因子:1.832; 五年影响因子:1.956 )

ISSN: 0179-9541

年卷期: 2014 年 133 卷 2 期

页码:

收录情况: SCI

摘要: Nitrogen (N) deficiency is a major yield-limiting factor in rice production. The objective of this study was to identify putative QTLs for low-N stress tolerance of rice, using an advanced backcross population derived from crosses between an indica cultivar '93-11' and a japonica cultivar '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 44 QTLs were identified on chromosomes 1, 2, 3, 4, 5, 6, 8 and 9. Eight intervals on five chromosomes were identified to harbour multiple QTLs, suggesting pleiotropism or multigenic effects according to the contributor of alleles. Some QTL clusters 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 of QTLs. Several unique QTLs for relative traits were detected, which suggested the specific genetic basis of relative performance.

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