Nitrogen utilisation-efficient oilseed rape (Brassica napus) genotypes exhibit stronger growth attributes from flowering stage onwards

文献类型： 外文期刊

第一作者： Guo, Xiao

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

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关键词： nitrogen utilisation efficiency; growth attributes; flowering stage; root function; Brassica napus L.; oilseed rape

期刊名称：FUNCTIONAL PLANT BIOLOGY （ 影响因子：2.617； 五年影响因子：2.729 ）

ISSN： 1445-4408

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收录情况： SCI

摘要： Preliminary studies observed a lower growth activity during the vegetative stage with higher growth attributes at the pod-filling stage among the high nitrogen (N) utilisation efficiency (NUtE) oilseed rape (Brassica napus L.) genotypes, compared with the low NUtE genotypes. Therefore, we hypothesised that there would exist a critical growth stage when distinctive phenotypic traits are exhibited to regulate yield formation and NUE. A field experiment and a hydroponic culture were conducted to characterise the differences in shoot and root physiological indicators of the high and low NUtE oilseed rape genotypes at seedling, bud, bolting, flowering and pod-filling stages. We found that flowering was the critical period when the reverse growth habit occurred between high and low NUtE genotypes. The high NUtE genotypes displayed larger values of root traits, stronger N uptake kinetics parameters, higher activity of leaf glutamine synthetase (GS) and glutamate synthetase (GOGAT), larger SPAD values and net photosynthetic rate, ultimately leading to higher seed yield and NUE. Our results indicate that flowering is the critical growth stage to distinguish the high from low NUtE oilseed rape genotypes, and plant breeders may focus on selecting root and shoot phenotypic traits from flowering stage onwards to achieve both high yields and NUE for oilseed rape genotypes.

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