数字农科院2.0

Transcription factor CaPHR3 enhances phosphate starvation tolerance by up-regulating the expression of the CaPHT1;4 phosphate transporter gene in pepper

文献类型： 外文期刊

作者： Qing Bin Chen;Xiao Yu Sun;Meng Yao Zheng;Ya Nan Liu;Jin Xiu Zhang;Qing Feng Zhou;Dong Li Pei;Dong Mei Liu;Ya Wei Chen;Hang Gao;Xiao Long Xing;Hao Jiang;Xue Ling Wang;Li Yuan;Wen Jing Wang

作者机构：

关键词： （0-2-2）CaPHR3;Capsicum annuum;Phosphate starvation

期刊名称： International Journal of Biological Macromolecules

ISSN： 0141-8130

年卷期： 2025 年 292 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Plants frequently encounter phosphate (Pi) starvation due to its scarce availability in soil, necessitating an adaptive phosphate starvation response (PSR). This study explores this adaptation in pepper (Capsicum annuum L.) under low-Pi stress, focusing on the PHOSPHATE STARVATION RESPONSE (PHR) gene family. We observably halted shoot growth but promoted root elongation in pepper seedlings under low-Pi conditions, significantly impacting regulatory networks. Our research identified 13 PHR transcription factors in pepper, particularly noting that CaPHR3 rapidly up-regulates in response to low-Pi stress. Overexpressing CaPHR3 in Arabidopsis thaliana enhanced Pi starvation tolerance by modulating PSR-related genes and mitigated hypersensitivity in the Atphr1phl1 double mutant. Furthermore, CaPHR3 binds to the P1BS motif in the pepper PHOSPHATE TRANSPORTER 1;4 (PHT1;4) promoter to boost its expression under Pi deficiency. This activation increased Pi uptake and starvation tolerance when overexpressed. Overall, we pinpointed key players in the PSR mechanism through the CaPHR3–CaPHT1;4 pathway, contributing significantly to our understanding of Pi homeostasis and adaptive strategies in pepper under Pi-deficient conditions.

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