文献类型： 外文期刊

作者： Yuan, Kun ¹ ; Zhang, Hao ¹ ; Yu, Chaoji ¹ ; Luo, Nan ¹ ; Yan, Jijun ¹ ; Zheng, Shuang ³ ; Hu, Qingliang ¹ ; Zhang, Dahan ¹ ; Kou, Liquan ¹ ; Meng, Xiangbing ¹ ; Jing, Yanhui ¹ ; Chen, Mingjiang ¹ ; Ban, Xinwei ¹ ; Yan, Zongyun ¹ ; Lu, Zefu ⁵ ; Wu, Jian ⁶ ; Zhao, Yu ⁷ ; Liang, Yan ⁸ ; Wang, Yonghong ¹ ; Xiong, Guosheng ⁹ ; Chu, Jinfang ¹ ; Wang, Ertao ³ ; Li, Jiayang ¹ ; Wang, Bing ¹ ;

作者机构： 1.Chinese Acad Sci, State Key Lab Plant Gen, Beijing 100101, Peoples R China

2.Chinese Acad Sci, Inst Genet & Dev Biol, Innovat Acad Seed Design, Natl Ctr Plant Gene Res Beijing, Beijing 100101, Peoples R China

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

4.Chinese Acad Sci, Inst Plant Physiol & Ecol, CAS Ctr Excellence Mol Plant Sci, Natl Key Lab Plant Mol Genet, Shanghai 200032, Peoples R China

5.Chinese Acad Agr Sci, Inst Crop Sci, State Key Lab Crop Gene Resources & Breeding, Beijing 100081, Peoples R China

6.South China Agr Univ, Coll Agr, Guangdong Lab Lingnan Modern Agr, State Key Lab Conservat & Utilizat Subtrop Agrobio, Guangzhou 510642, Peoples R China

7.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Hubei Hongshan Lab, Wuhan 430070, Peoples R China

8.Shandong Agr Univ, Coll Life Sci, Tai An 271018, Shandong, Peoples R China

9.Nanjing Agr Univ, Acad Adv Interdisciplinary Studies, Nanjing 210095, Peoples R China

10.Yazhou Bay Seed Lab, Sanya 572024, Hainan, Peoples R China

关键词： rice; Pi deficiency; strigolactone; NSP1 and NSP2; CRL1; nitrogen and Pi absorption

期刊名称：MOLECULAR PLANT （ 影响因子：27.5； 五年影响因子：22.6 ）

ISSN： 1674-2052

年卷期： 2023 年 16 卷 11 期

页码：

收录情况： SCI

摘要： Phosphorus is an essential macronutrient for plant development and metabolism, and plants have evolved ingenious mechanisms to overcome phosphate (Pi) starvation. However, the molecular mechanisms underlying the regulation of shoot and root architecture by low phosphorus conditions and the coordinated utilization of Pi and nitrogen remain largely unclear. Here, we show that Nodulation Signaling Pathway 1 (NSP1) and NSP2 regulate rice tiller number by promoting the biosynthesis of strigolactones (SLs), a class of phytohormones with fundamental effects on plant architecture and environmental responses. We found that NSP1 and NSP2 are induced by Oryza sativa PHOSPHATE STARVATION RESPONSE2 (OsPHR2) in response to low-Pi stress and form a complex to directly bind the promoters of SL biosynthesis genes, thus markedly increasing SL biosynthesis in rice. Interestingly, the NSP1/2-SL signaling module represses the expression of CROWN ROOTLESS 1 (CRL1), a newly identified early SL-responsive gene in roots, to restrain lateral root density under Pi deficiency. We also demonstrated that GR244DO treatment under normal conditions inhibits the expression of OsNRTs and OsAMTs to suppress nitrogen absorption but enhances the expression of OsPTs to promote Pi absorption, thus facilitating the balance between nitrogen and phosphorus uptake in rice. Importantly, we found that NSP1p:NSP1 and NSP2p:NSP2 transgenic plants show improved agronomic traits and grain yield under low-and medium-phosphorus conditions. Taken together, these results revealed a novel regulatory mechanism of SL biosynthesis and signaling in response to Pi starvation, providing genetic resources for improving plant architecture and nutrient-use efficiency in low-Pi environments.