Mining of Candidate Maize Genes for Nitrogen Use Efficiency by Integrating Gene Expression and QTL Data
文献类型: 外文期刊
第一作者: Liu, Ruixiang
作者: Liu, Ruixiang;Zhang, Hao;Zhao, Pu;Zhang, Zuxin;Liu, Ruixiang;Zhang, Zuxin;Zheng, Yonglian;Liang, Wenke;Tian, Zhigang
作者机构:
关键词: Maize;Nitrogen use efficiency (NUE);Quantitative trait loci (QTL);Carbon assimilation;Introgression line
期刊名称:PLANT MOLECULAR BIOLOGY REPORTER ( 影响因子:1.595; 五年影响因子:2.042 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: Breeding maize varieties for high nitrogen (N) use efficiency (NUE) by marker-assisted selection using NUE quantitative trait locus (QTL) or by genetic transfer of NUE-associated genes is a viable approach for increasing grain yield in N-limited production areas. In this investigation, we evaluated a set of introgression line populations under N supply and N deficiency conditions. From 42 QTLs for grain yield and yield components, 23 were identified under N supply conditions and 33 from N limited conditions. Meta-analysis of published maize NUE QTLs revealed 37 "consensus" QTLs, of which, 18 was detected under low N conditions. In addition, 258 unique ESTs associated with low N stress response, N uptake, transport, and assimilation were aligned on the maize genome by in silico mapping. Integrating the EST map with the QTL map has resulted in the identification of candidate NUE-associated genes of the following functional categories: N uptake, transport, and assimilation; carbon (C) metabolism and assimilation; and cascades of stress response and signal transduction genes. Nine candidates that have been introgressed into Ye478 significantly altered grain yield/yield components. It is suggested that the dynamics of interactions between C and N metabolism are important for maize yield. A high NUE variety should have a highly efficient C assimilation per unit N and actively express CO2 assimilation-related genes under N-limited conditions.
分类号: Q94
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