Post-flowering nitrogen uptake leads to the genotypic variation in seed nitrogen accumulation of oilseed rape

文献类型： 外文期刊

第一作者： Guo, Xiao

作者： Guo, Xiao;Nan, Yunyou;He, Huiying;Gao, Yajun;Guo, Xiao;Ma, Bao-Luo;McLaughlin, Neil B.;Wu, Xiaoming;Chen, Biyun;Gao, Yajun

作者机构：

关键词： Brassica napus L; Genotypic variation; Post-flowering nitrogen uptake; Seed nitrogen accumulation; Root senescence

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 2021 年 461 卷 1-2 期

页码：

收录情况： SCI

摘要： Aims Increasing post-flowering nitrogen (N) uptake is likely to improve seed N accumulation, ultimately leading to greater seed yield and N use efficiency (NUE). Methods A comprehensive study on contrasting N utilization efficiency (NUtE) winter oilseed rape genotypes was conducted for three years (2017-2020) to unravel the effect of post-flowering N uptake on seed N accumulation. Results Compared to the low NUtE genotype, the high NUtE genotype displayed respectively 31%, 28% and 70% greater root biomass, length and volume, along with 40%, 44%, 46% and 82% higher root nitrate reductase (NR), glutamine synthetase (GS), glutamate synthetase (GOGAT), and glutamate dehydrogenase (GDH) activities after flowering. These were accompanied by a significant increase (P < 0.05) in catalases (134%), peroxidase (45%), glutathione (45%) and ascorbate peroxidase (41%), leading to 27% higher seed N accumulation, 23% higher seed yield and 60% higher NUE. Conclusions Stronger post-flowering N uptake potential for high NUtE genotype was a main contributor to the enhanced seed N accumulation, and ultimately increased seed yield and NUE.

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