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Dry matter and nitrogen accumulation, partitioning, and translocation in synthetic-derived wheat cultivars under nitrogen deficiency at the post-jointing stage

文献类型： 外文期刊

作者： Liu, Miao 1 , 2 , 3 ; Wu, Xiaoli 1 , 2 , 3 ; Li, Chaosu 1 , 2 , 3 ; Li, Ming 1 ; Xiong, Tao 1 ; Tang, Yonglu 1 , 2 , 3 ;

作者机构： 1.Sichuan Acad Agr Sci, Crop Res Inst, Chengdu 610066, Peoples R China

2.Minist Agr, Key Lab Crop Ecophysiol & Farming Syst Southwest, Chengdu 611130, Peoples R China

3.Sichuan Prov Key Lab Water Saving Agr Hill Areas, Chengdu 610066, Peoples R China

关键词： Nitrogen stress; Synthetic hexaploid wheat; Grain yield; Biomass; Nitrogen use efficiency

期刊名称： FIELD CROPS RESEARCH

ISSN： 0378-4290

年卷期： 2020 年 248 卷

页码：

收录情况： SCI

摘要： Synthetic hexaploid wheat-derived cultivars (SDCs) show substantially improved yield potential compared with that of nonsynthetic-derived cultivars (NSCs) developed by conventional breeding. However, the relationship between the high-yielding traits of SDCs and nitrogen (N) use efficiency, especially their performance under N deficiency, is unclear. A field experiment was conducted in two successive seasons examining the responses of six genotypes (three SDCs and three NSCs) under two N treatments: N+ (N sufficiency, N nutrition index >= 1) and N- (N deficiency, N nutrition index < 1). N deficiency had a significantly negative effect on grain yield (GY) and yield-related traits. Compared with that of NSCs, SDCs showed 14% (N + ) and 16% (N - ) higher GY. This yield gain was mainly attributable to the higher total dry matter (DM) and post-anthesis DM accumulation of SDCs under both N treatments. On average, SDCs showed higher chlorophyll content than NSCs in the three upper leaves from 0 to 32 days post-anthesis, which was highly positively correlated with GY under both N treatments. Total and fertilizer N accumulation were significantly decreased under N deficiency. Compared with that of NSCs, SDCs showed lower grain protein concentrations under both N treatments, which was negatively correlated with GY. In addition, SDCs showed significantly higher N use efficiency and N utilization efficiency (NUtE) than NSCs, and a positive correlation was detected between NUtE and GY. The results indicated that SDCs show advantages over NSCs in GY, DM accumulation, and NUtE under N deficiency, and thus cultivation of SDCs shows potential to reduce N waste and environmental contamination.

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