GAI Functions in the Plant Response to Dehydration Stress in Arabidopsis thaliana

被引:43
|
作者
Wang, Zhijuan [1 ]
Liu, Liu [2 ,3 ]
Cheng, Chunhong [2 ,3 ]
Ren, Ziyin [1 ]
Xu, Shimin [1 ]
Li, Xia [1 ]
机构
[1] Huazhong Agr Univ, Coll Plant Sci & Technol, State Key Lab Agr Microbiol, Wuhan 430070, Peoples R China
[2] Chinese Acad Sci, Inst Genet & Dev Biol, Ctr Agr Res Resources, State Key Lab Plant Cell & Chromosome Engn, 286 Huaizhong Rd, Shijiazhuang 050021, Hebei, Peoples R China
[3] Chinese Acad Sci, Grad Univ, 19A Yuquan Rd, Beijing 100049, Peoples R China
关键词
drought; GA; DELLA; ABF2; protein-protein interaction; ABA; TOLERANCE; HOMOLOG; DELLAS; AREB1;
D O I
10.3390/ijms21030819
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
DELLA (GAI/RGA/RGL1/RGL2/RGL3) proteins are key negative regulators in GA (gibberellin) signaling and are involved in regulating plant growth as a response to environmental stresses. It has been shown that the DELLA protein PROCERA (PRO) in tomato promotes drought tolerance, but its molecular mechanism remains unknown. Here, we showed that the gai-1 (gibberellin insensitive 1) mutant (generated from the gai-1 (Ler) allele (with a 17 amino acid deletion within the DELLA domain of GAI) by backcrossing gai-1 (Ler) with Col-0 three times), the gain-of-function mutant of GAI (GA INSENSITIVE) in Arabidopsis, increases drought tolerance. The stomatal density of the gai-1 mutant was increased but its stomatal aperture was decreased under abscisic acid (ABA) treatment conditions, suggesting that the drought tolerance of the gai-1 mutant is a complex trait. We further tested the interactions between DELLA proteins and ABF2 (abscisic acid (ABA)-responsive element (ABRE)-binding transcription factors) and found that there was a strong interaction between DELLA proteins and ABF2. Our results provide new insight into DELLA proteins and their role in drought stress tolerance.
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页数:8
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