OsGST Positively Regulates Root Cell Wall Phosphorus Reutilization in P-Deficient Rice Through an NO-Associated Pathway.

Authors

Yong Qiang Gao, Chong Wei Zhong, Yan Zhou, Jia Qi Li, Jiu Huang, Lu Zheng, Ren Fang Shen, Xiao Fang Zhu

Published in

Physiologia plantarum. Volume 178. Issue 6.

Abstract

Limited phosphorus (P) availability strongly restricts rice growth and yield formation. Glutathione S-transferases (GSTs) participate in stress responses, but their roles in rice adaptation to low P remain unclear. Here, we characterized a Tau-class GST gene, OsGST (LOC_Os10g38160/OsGSTU22), in rice under P deficiency. Loss-of-function osgst mutants showed weaker growth and lower soluble, total, and xylem P levels under -P, whereas OsGST-overexpressing lines showed improved growth and higher P accumulation. OsGST was preferentially expressed in roots and induced by P deficiency. Under P deficiency, the osgst mutants retained more P in root cell wall and pectin fractions than Nip, accompanied by higher pectin methylesterification, lower NO accumulation, reduced Oryza sativa phosphate transporter 2/6/8 (OsPT2/6/8) transcript levels, disrupted glutathione homeostasis, and increased ROS accumulation. Application of the NO donor sodium nitroprusside reduced the differences in cell wall P mobilization and P accumulation between Nipponbare and osgst mutants. These results suggest that OsGST promotes rice adaptation to P deficiency by maintaining redox homeostasis and facilitating NO-associated root cell wall P reutilization.

PMID:
43021716
Bibliographic data and abstract were imported from PubMed on 13 Nov 2026.

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