盐度
拟南芥
突变体
生物
转录因子
脱落酸
细胞生物学
拟南芥
抄写(语言学)
调节器
转录调控
植物
基因
遗传学
生态学
语言学
哲学
作者
Jiancan Du,Xing-wang Zhu,Kunrong He,Mengyi Kui,Ju‐Ping Zhang,Xiao Han,Qiantang Fu,Yanjuan Jiang,Yanru Hu
出处
期刊:Plant Physiology
[Oxford University Press]
日期:2023-06-28
卷期号:193 (2): 1675-1694
被引量:12
标识
DOI:10.1093/plphys/kiad370
摘要
CONSTANS (CO) is a critical regulator of flowering that combines photoperiodic and circadian signals in Arabidopsis (Arabidopsis thaliana). CO is expressed in multiple tissues, including seedling roots and young leaves. However, the roles and underlying mechanisms of CO in modulating physiological processes outside of flowering remain obscure. Here, we show that the expression of CO responds to salinity treatment. CO negatively mediated salinity tolerance under long-day (LD) conditions. Seedlings from co-mutants were more tolerant to salinity stress, whereas overexpression of CO resulted in plants with reduced tolerance to salinity stress. Further genetic analyses revealed the negative involvement of GIGANTEA (GI) in salinity tolerance requires a functional CO. Mechanistic analysis demonstrated that CO physically interacts with 4 critical basic leucine zipper (bZIP) transcription factors; ABSCISIC ACID-RESPONSIVE ELEMENT BINDING FACTOR1 (ABF1), ABF2, ABF3, and ABF4. Disrupting these ABFs made plants hypersensitive to salinity stress, demonstrating that ABFs enhance salinity tolerance. Moreover, ABF mutations largely rescued the salinity-tolerant phenotype of co-mutants. CO suppresses the expression of several salinity-responsive genes and influences the transcriptional regulation function of ABF3. Collectively, our results show that the LD-induced CO works antagonistically with ABFs to modulate salinity responses, thus revealing how CO negatively regulates plant adaptation to salinity stress.
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