A nitrogen-responsive cytokinin oxidase/dehydrogenase regulates root response to high ammonium in rice
文献类型： 外文期刊
作者： Li, Lun 1 ; Jia, Letian 1 ; Duan, Xingliang 1 ; Lv, Yuanda 3 ; Ye, Chengyu 1 ; Ding, Chengqiang 5 ; Zhang, Yuwen 1 ; Qi, Weicong 3 ; Motte, Hans 8 ; Beeckman, Tom 8 ; Luo, Le 1 ; Xuan, Wei 1 ;
作者机构： 1.Nanjing Agr Univ, Sanya Inst, Natl Key Lab Crop Genet & Germplasm Enhancement &, Nanjing 210095, Peoples R China
2.Nanjing Agr Univ, MOA Key Lab Plant Nutr & Fertilizat Lowermiddle Re, Nanjing 210095, Peoples R China
3.Zhongshan Biol Breeding Lab, Nanjing 210014, Peoples R China
4.Jiangsu Acad Agr Sci, Excellence & Innovat Ctr, Nanjing 210014, Peoples R China
5.Nanjing Agr Univ, Coll Agr, Nanjing 210095, Peoples R China
6.Minist Agr, Key Lab Crop Physiol Ecol & Prod Management, Nanjing 210095, Peoples R China
7.Collaborat Innovat Ctr Modern Crop Prod Cosponsore, Nanjing 210095, Peoples R China
8.Univ Ghent, Dept Plant Biotechnol & Bioinformat, Technol Pk 71, B-9052 Ghent, Belgium
9.Ctr Plant Syst Biol VIB, Technol Pk 71, B-9052 Ghent, Belgium
关键词： ammonium; auxin; CKX; cytokinin; lateral root; rice; seminal root
期刊名称：NEW PHYTOLOGIST （ 影响因子：8.1； 五年影响因子：10.3 ）
ISSN： 0028-646X
年卷期： 2024 年 244 卷 4 期
页码：
收录情况： SCI
摘要： Plant root system is significantly influenced by high soil levels of ammonium nitrogen, leading to reduced root elongation and enhanced lateral root branching. In Arabidopsis, these processes have been reported to be mediated by phytohormones and their downstream signaling pathways, while the controlling mechanisms remain elusive in crops. Through a transcriptome analysis of roots subjected to high/low ammonium treatments, we identified a cytokinin oxidase/dehydrogenase encoding gene, CKX3, whose expression is induced by high ammonium. Knocking out CKX3 and its homologue CKX8 results in shorter seminal roots, fewer lateral roots, and reduced sensitivity to high ammonium. Endogenous cytokinin levels are elevated by high ammonium or in ckx3 mutants. Cytokinin application results in shorter seminal roots and fewer lateral roots in wild-type, mimicking the root responses of ckx3 mutants to high ammonium. Furthermore, CKX3 is transcriptionally activated by type-B RR25 and RR26, and ckx3 mutants have reduced auxin content and signaling in roots under low ammonium. This study identified RR25/26-CKX3-cytokinin as a signal module that mediates root responses to external ammonium by modulating of auxin signaling in the root meristem and lateral root primordium. This highlights the critical role of cytokinin metabolism in regulating rice root development in response to ammonium.
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