TaPPR13, a Pentatricopeptide Repeat Protein Gene Activated by TaBZR2, Confers Drought Stress Tolerance by Enhancing the Antioxidant Defense System and Promoting Retrograde Signaling in Wheat ( Triticum aestivum )
Source abstract
Abstract
Abstract The wheat ( Triticum aestivum ) brassinazole‐resistant 2 ( TaBZR2 ) gene is identified as significantly associated with drought tolerance by genome‐wide association study (GWAS), and a chloroplast pentatricopeptide repeat (PPR) protein gene TaPPR13 functioned as a positive drought stress regulator downstream of TaBZR2. Overexpression of TaPPR13 enhanced the antioxidative defense system, whereas knockdown of TaPPR13 led to the accumulation of reactive oxygen species (ROS) and caused abnormalities in chloroplast thylakoids under drought stress conditions. RNA‐seq analysis showed that overexpression of TaPPR13 significantly upregulated the expression of nuclear‐encoded genes involved in ROS scavenging and the abscisic acid (ABA) signaling pathway. Furthermore, TaPPR13 interacted with TaAOR1 and TaSIG5 to facilitate detoxification and regulate chloroplast gene expression, thereby enhancing drought tolerance. Overexpression of TaPPR13 and TaAOR1 mediated stomatal closure to reduce water loss, improving photosynthetic capacity and conferring a yield advantage under drought stress. These findings show that TaPPR13 promotes retrograde signaling to alter nuclear gene expression, with the TaBZR2‐TaPPR13‐TaAOR1/TaSIG5 module representing a novel signaling pathway that likely plays a pivotal role in drought stress response.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Plant Stress Responses and Tolerance · Plant Genetic and Mutation Studies · Plant Micronutrient Interactions and Effects
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop Sciences Chinese Academy of Agricultural Sciences (CAAS) Beijing 100081 China
State Key Laboratory for Crop Stress Resistance and High‐Efficiency Production College of Agronomy Northwest Agricultural and Forestry University Yangling 712100 China
Institute of Crop Science Ningxia Academy of Agriculture and Forestry Sciences Yongning 750105 China
Institute of Wheat Research The Industrial Crop Institute Shanxi Agricultural University Taiyuan 030000 China
Institute of Biotechnology and Food Science Hebei Academy of Agriculture and Forestry Sciences/Hebei Key Laboratory of Drought‐Alkali Tolerance in Wheat Cangzhou 050051 China
National Engineering Laboratory for Wheat and Maize/Key Laboratory of Wheat Biology and Genetic Improvement Crop Research Institute Shandong Academy of Agricultural Sciences Jinan 250100 China
National Nanfan Research Institute (Sanya) Chinese Academy of Agricultural Sciences/Seed Industry Laboratory Sanya 572024 China
Funding
National Natural Science Foundation of China
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