NaCl Facilitates Cell Wall Phosphorus Reutilization in Abscisic Acid Dependent Manner in Phosphorus Deficient Rice Root

• Published in: Rice science Vol. 30; no. 2; pp. 138 - 147
• Main Authors: Xiaozheng, Yang, Yusong, Liu, Jing, Huang, Ye, Tao, Yifeng, Wang, Renfang, Shen, Xiaofang, Zhu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2023; University of Chinese Academy of Sciences,Beijing 100049,China%State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Science,Nanjing 210008,China; College of Land Resources and Environment,Jiangxi Agricultural University,Nanchang 330045,China%State Key Laboratory of Rice Biology,China National Rice Research Institute,Hangzhou 311400,China; State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Science,Nanjing 210008,China; Elsevier
• Subjects: abscisic acid; cell wall; NaCl; phosphorus deficiency; phosphorus transporter; remobilization; NaCl; abscisic acid; phosphorus deficiency; cell wall; remobilization; phosphorus transporter
• ISSN: 1672-6308; 1876-4762
• DOI: 10.1016/j.rsci.2023.01.006

Phosphorus (P) starvation in rice facilitates the reutilization of root cell wall P by enhancing the pectin content. NaCl modulates pectin content, however, it is still unknown whether NaCl is also involved in the process of pectin regulated cell wall P remobilization in rice under P starved conditions. In this study, we found that 10 mmol/L NaCl increased the shoot and root biomasses under P deficiency to a remarkable extent, in company with the elevated shoot and root soluble P contents in rice. Further analysis indicated that exogenous NaCl enhanced the root cell wall P mobilization by increasing the pectin methylesterase activity and uronic acid content in pectin suggesting the involvement of NaCl in the process of cell wall P reutilization in P starved rice roots. Additionally, exogenous NaCl up-regulated the expression of P transporter OsPT6, which was induced by P deficiency, suggesting that NaCl also facilitated the P translocation prominently from root to shoot in P starved rice. Moreover, exogenous abscisic acid (ABA) can reverse the NaCl-mediated mitigation under P deficiency, indicating the involvement of ABA in the NaCl regulated root cell wall P reutilization. Taken together, our results demonstrated that NaCl can activate the reutilization of root cell wall P in P starved rice, which is dependent on the ABA accumulation pathway.