Elevated ambient CO2 promotes auxin-modulated NO3-uptake and growth of Brassica napus L. under low nitrogen availability

文献类型： 外文期刊

第一作者： Luo, Shang

作者： Luo, Shang;Yang, Lan;Liu, Xinyu;Li, Changwei;Zhuo, Hong;Rong, Xiangmin;Zhang, Zhenhua;Han, Yongliang;Wang, Jie;Wu, Zhimin

作者机构：

关键词： Nitrogen; IAA; Brassica napus L; Elevated CO2

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：4.7； 五年影响因子：5.4 ）

ISSN： 0098-8472

年卷期： 2024 年 224 卷

页码：

收录情况： SCI

摘要： While plant growth is promoted by elevated carbon dioxide (CO2), 2 ), it is constrained by low nitrogen (N, 1 mmol L- 1 NO3-) 3- ) availability. Here, we investigated N absorption responses to elevated CO2 2 under low-N conditions. Brassica napus L. was cultured hydroponically in a low-N nutrient solution at normal and elevated ambient CO2 2 levels, at normal CO2 2 in the presence of exogenous auxin (Indole-3-acetic acid, IAA), and at elevated CO2 2 in the presence of N-1-naphthylphthalamic acid (NPA), an inhibitor of auxin polar transport. Photosynthetic rate, biosynthesis of 3-deoxy-d-arabinoheptanoic acid-7-phosphate (DAHP), tryptophan and IAA, and IAA polar transport from shoots to roots were enhanced under elevated CO2 2 compared with controls. Furthermore, increased root growth, Plasma membrane (PM) H+-ATPase +-ATPase activity, and expression of NRT1.1 and NRT2.1 resulting in higher total N were observed under elevated CO2 2 and normal CO2 2 + IAA treatment compared with controls. Moreover, the usual promotion of root growth, H+-ATPase +-ATPase activity, and expression of NRT1.1 and NRT2.1 by elevated CO2 2 vanished once IAA polar transport was inhibited; total N did not differ between elevated CO2 2 + NPA-treated plants and controls. Elevated CO2 2 promoted IAA biosynthesis and its polar transport from shoots to roots under low-N conditions, promoting root growth, PM H+-ATPase +-ATPase activity, and the expression of NRT1.1 and NRT2.1, thereby enhancing N uptake and plant growth.

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