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Rice plants respond to ammonium stress by adopting a helical root growth pattern

文献类型： 外文期刊

作者： Jia, Letian 1 ; Xie, Yuanming 1 ; Wang, Zhen 1 ; Luo, Long 1 ; Zhang, Chi 1 ; Pelissier, Pierre-Mathieu 3 ; Parizot, B 1 ;

作者机构： 1.Nanjing Agr Univ, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Peoples R China

2.Nanjing Agr Univ, MOA Key Lab Plant Nutr & Fertilizat Lower Middle, Nanjing 210095, Peoples R China

3.Univ Ghent, Dept Plant Biotechnol & Bioinformat, Technol Pk 71, B-9052 Ghent, Belgium

4.VIB UGent Ctr Plant Syst Biol, Technol Pk 71, B-9052 Ghent, Belgium

5.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China

6.China Agr Univ, Coll Biol Sci, State Key Lab Plant Physiol & Biochem, Beijing 100193, Peoples R China

7.Henan Univ, Sch Life Sci, Key Lab Plant Stress Biol, Kaifeng 475004, Peoples R China

关键词： ammonium; helical root response; root elongation; auxin; acidic stress; Oryza sativaL; Arabidopsis thaliana

期刊名称：PLANT JOURNAL （ 影响因子：6.417； 五年影响因子：7.627 ）

ISSN： 0960-7412

年卷期：

页码：

收录情况： SCI

摘要： High levels of ammonium nutrition reduce plant growth and different plant species have developed distinct strategies to maximize ammonium acquisition while alleviating ammonium toxicity through modulating root growth. To date, the mechanisms underlying plant tolerance or sensitivity towards ammonium remain unclear. Rice (Oryza sativa) uses ammonium as its main N source. Here we show that ammonium supply restricts rice root elongation and induces a helical growth pattern, which is attributed to root acidification resulting from ammonium uptake. Ammonium-induced low pH triggers the asymmetric distribution of auxin in rice root tips through changes in auxin signaling, thereby inducing a helical growth response. Blocking auxin signaling completely inhibited this root response. In contrast, this root response is not activated in ammonium-treated Arabidopsis. Acidification of Arabidopsis roots leads to the protonation of indole-3-acetic acid and dampening of the intracellular auxin signaling levels that are required for maintaining root growth. Our study suggests a different mode of action by ammonium on the root pattern and auxin response machinery in rice versus Arabidopsis, and the rice-specific helical root response towards ammonium is an expression of the ability of rice to moderate auxin signaling and root growth to utilize ammonium while confronting acidic stress.

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