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Positive feed-forward regulation of nitrate uptake by rice roots and its molecular mechanism

文献类型： 外文期刊

作者： Li, Jinzhi 1 ; Li, Bing 1 ; Yang, Yan 1 ; Zhang, Shumei 1 ; Chen, Sisi 1 ; You, Lin 1 ; Liu, Yao 1 ; Gao, Jianming 2 ;

作者机构： 1.Jiangxi Sci & Technol Normal Univ, Coll Life Sci, Nanchang, Peoples R China

2.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Hainan Inst Trop Agr Resources, Haikou, Peoples R China

关键词： Rice; Nitrate uptake; Signaling molecule; Non-invasive method; Positive feed-forward control

期刊名称：SCIENTIFIC REPORTS （ 影响因子：3.8； 五年影响因子：4.3 ）

ISSN： 2045-2322

年卷期： 2024 年 14 卷 1 期

页码：

收录情况： SCI

摘要： To investigate the positive feed-forward regulatory mechanism of nitrate uptake by rice, its responses to various light and carbohydrates were compared. In order to measure nitrate uptake in real time, the non-invasive method was used. The results showed that net nitrate uptake increased in the light and decreased in the dark, and finally reached a steady state after about 5 h. Based on it, carbohydrates effects could be investigated without considering light effects. After sucrose addition for 2 h, net nitrate uptake increased by about 80% without a lag, while glucose, fructose and raffinose had a slight effect with a lag and other sugars had no effect. It provided an evidence that sucrose was a positive feed-forward signal molecule of nitrate uptake by rice roots. To further analyze the effect of sucrose on the expression of high affinity nitrate transporter genes OsNRT2.1, OsNRT2.2, OsNRT2.3a and OsNRT2.3b, qRT-PCR was used to further verify after treated with 10 mM sucrose. The results revealed that these genes expression was immediately up-regulated, which indicated that these genes were post transcriptionally regulated. Further, 15N exchange dynamics analyzed N transport. It is benefit for increasing nitrate uptake by rice and improving its yield.

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