Genetic variation in the aquaporin TONOPLAST INTRINSIC PROTEIN 4;3 modulates maize cold tolerance
文献类型： 外文期刊
作者： Zeng, Rong 1 ; Zhang, Xiaoyan 1 ; Song, Guangshu 2 ; Lv, Qingxue 2 ; Li, Minze 1 ; Fu, Diyi 1 ; Zhang, Zhuo 1 ; Gao, Lei 1 ; Zhang, Shuaisong 1 ; Yang, Xiaohong 1 ; Tian, Feng 1 ; Yang, Shuhua 1 ; Shi, Yiting 1 ;
作者机构： 1.China Agr Univ, Frontiers Sci Ctr Mol Design Breeding, Ctr Crop Funct Genom & Mol Breeding, State Key Lab Plant Environm Resilience,Coll Biol, Beijing, Peoples R China
2.Jilin Acad Agr Sci, Northeast Agr Res Ctr China, Changchun, Peoples R China
3.China Agr Univ, Natl Maize Improvement Ctr, Frontiers Sci Ctr Mol Design Breeding, Dept Plant Genet & Breeding, Beijing, Peoples R China
关键词： cold stress; maize; TIP4;3; natural variation; stomatal movement; reactive oxygen species
期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：10.1； 五年影响因子：11.6 ）
ISSN： 1467-7644
年卷期： 2024 年
页码：
收录情况： SCI
摘要： Cold stress is a major abiotic stress that threatens maize (Zea mays L.) production worldwide. Understanding the molecular mechanisms underlying cold tolerance is crucial for breeding resilient maize varieties. Tonoplast intrinsic proteins (TIPs) are a subfamily of aquaporins in plants. Here, we report that TIP family proteins are involved in maize cold tolerance. The expression of most TIP genes was responsive to cold stress. Overexpressing TIP2;1, TIP3;2 or TIP4;3 reduced the cold tolerance of maize seedlings, while loss-of-function mutants of TIP4;3 exhibited enhanced cold tolerance. Candidate gene-based association analysis revealed that a 328-bp transposon insertion in the promoter region of TIP4;3 was strongly associated with maize cold tolerance. This transposon insertion conferred cold tolerance by repressing TIP4;3 expression through increased methylation of its promoter region. Moreover, TIP4;3 was found to suppress stomatal closure and facilitate reactive oxygen species (ROS) accumulation under cold stress, thereby inhibiting the expression of cold-responsive genes, including DEHYDRATION-RESPONSIVE ELEMENT BINDING FACTOR 1 (DREB1) genes and a subset of peroxidase genes, ultimately attenuating maize cold tolerance. This study thus elucidates the mechanism underlying TIP-mediated cold tolerance and identifies a favourable TIP4;3 allele as a potential genetic resource for breeding cold-tolerant maize varieties.
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