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- Title
Post-flowering nitrogen uptake leads to the genotypic variation in seed nitrogen accumulation of oilseed rape.
- Authors
Guo, Xiao; Nan, Yunyou; He, Huiying; Ma, Bao-Luo; McLaughlin, Neil B.; Wu, Xiaoming; Chen, Biyun; Gao, Yajun
- Abstract
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.
- Subjects
GLUTAMATE dehydrogenase; NITRATE reductase; GLUTAMINE synthetase; SEED yield; SEEDS
- Publication
Plant & Soil, 2021, Vol 461, Issue 1/2, p281
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-020-04815-7