Low-nitrogen stress tolerance and nitrogen agronomic efficiency among maize inbreds: comparison of multiple indices and evaluation of genetic variation

文献类型: 外文期刊

第一作者: Li, Xinhai

作者: Li, Xinhai;Li, Mingshun;Zhang, Degui;Hao, Zhuanfang;Weng, Jianfeng;Xu, Yunbi;Bai, Li;Zhang, Shihuang;Xie, Chuanxiao;Wu, Yongshen;Liu, Wenguo;Xu, Yunbi;Xu, Yunbi

作者机构:

关键词: nitrogen: 7727-37-9;chlorophyll;genetic variation;plant height;agronomic efficiency;kernel weight;anthesis-silking interval;nitrogen stress tolerance;multiple index comparison;absolute grain yield;ear kernel number

期刊名称:EUPHYTICA ( 影响因子:1.895; 五年影响因子:2.181 )

ISSN:

年卷期:

页码:

收录情况: SCI

摘要: Limited information is available on genetic variation in low-nitrogen (low-N) stress tolerance and N-use efficiency (NUE) among maize inbreds. To unveil this information, a panel of 189 diverse maize inbred lines was evaluated under contrasting levels of N availability over 2 years. Low-N agronomic efficiency (LNAE), absolute grain yield (GY) at low-N conditions, and the ratio between GY at low-N and optimum-N conditions were taken into account to represent low-N tolerance. Additionally, N-agronomic efficiency (NAE) along with other agronomic traits was also analyzed. Analysis of variance revealed significant effects of genotype on LNAE, NAE, and GY. The estimated broad-sense heritability was 0.38 for LNAE while it was only 0.11 for NAE, implying that selection based on LNAE should be more effective than NAE. LNAE exhibited highly positive genotypic and phenotypic correlations with GY, ear kernel number (EKN), kernel weight, plant height (PH), and chlorophyll content at low-N conditions, while it was negatively correlated with grain-N content and anthesis-silking interval. Path analysis indicated that the EKN at low-N stress had the highest positive effects on LNAE.

分类号: S3

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