N-efficient cotton genotype grown under low nitrogen shows relatively large root system, high biomass accumulation and nitrogen metabolism

文献类型： 外文期刊

第一作者： Iqbal, Asif

作者： Iqbal, Asif;Dong Qiang;Wang Xiangru;Gui Huiping;Niu Jing;Li Leilei;Zhang Hengheng;Pang Nianchang;Zhang Xiling;Song Meizhen;Wang Xiangru;Zhang Xiling;Song Meizhen;Zhang Xiling;Song Meizhen

作者机构：

期刊名称：AGRONOMY JOURNAL （ 影响因子：2.65； 五年影响因子：2.963 ）

ISSN： 0002-1962

年卷期： 2022 年 114 卷 1 期

页码：

收录情况： SCI

摘要： A larger root system enhanced biomass accumulation, and high nitrogen (N) metabolism is an effective mechanism of plants in response to low N stress. How cotton plants balance N metabolism and enhanced biomass accumulation to support larger root systems under low N stress remains to be elucidated. This study deals with the changes in root development due to biomass accumulation and N metabolism in contrasting N-efficient cotton genotypes (CCRI-69, N-efficient, and XLZ-30, N-inefficient) under low (0.2 mM) and normal (2 mM) N concentrations. The results showed that genotype CCRI-69 produced a larger root system, high biomass accumulation, and N metabolism than XLZ-30. The flourishing root system of CCRI-69 was due to more allocation of sugars from shoot to root, especially under low N concentrations, to support efficient N uptake followed by high N metabolism and N use efficiency (NUE). In addition, CCRI-69 produced more dry biomass, high photosynthetic activity, N-related enzymatic activities, N uptake, and utilization under normal N concentration compared with XLZ-30. Based on multivariate analysis, root morphological traits, sugar contents, and N-assimilating enzymatic activities might be considered the key traits contributing to NUE and can also be used as potential indicators for genotypic evaluation. In the future, high N metabolism and allocation of more sugars under low N concentration could be studied at a molecular level to better understand the underlying molecular mechanism of NUE in cotton.

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