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    2019, Vol. 18 Issue (02): 417-427     DOI: 10.1016/S2095-3119(18)62127-6
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Kiwifruit (Actinidia chinensis) R1R2R3-MYB transcription factor AcMYB3R enhances drought and salinity tolerance in Arabidopsis thaliana
ZHANG Ya-bin1*, TANG Wei1, 2*, WANG Li-huan1, HU Ya-wen1, LIU Xian-wen2, LIU Yong-sheng1, 2  
1 Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, P.R.China
2 School of Food Science and Engineering, Hefei University of Technology, Hefei 230009, P.R.China
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Abstract 
Kiwifruit is an important fruit crop that is highly sensitive to environmental stresses, such as drought, heat, cold, water logging and phytopathogens.  Therefore it is indispensable to identify stress-responsive candidate genes in kiwifruit cultivars for the stress resistance improvement.  Here we report the isolation and characterization of a novel kiwifruit R1R2R3-MYB homolog (AcMYB3R) whose expression was induced by drought, salinity and cold stress.  In vitro assays showed that AcMYB3R is a nuclear protein with transcriptional activation activity by binding to the cis-element of the kiwifruit orthologue of G2/M phase-specific gene KNOLLE.  The Arabidopsis transgenic plants overexpressing AcMYB3R showed drastically enhanced tolerance to drought and salt stress.  The expressions of stress-responsive genes such as RD29A, RD29B, COR15A and RD22 were prominently up-regulated by ectopic expression of AcMYB3R.  Our study provides a valuable piece of information for functional genomics studies of kiwifruit and molecular breeding in improving stress tolerance for crop production.
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ZHANG Ya-bin
TANG Wei
WANG Li-huan
HU Ya-wen
LIU Xian-wen
LIU Yong-sheng
Key wordskiwifruit     R1R2R3-MYB     drought     abiotic stress     
Received: 2018-01-29; Accepted: 2018-05-23
Fund: This work was financially supported by the National Natural Science Foundation of China (31471157 and 31700266).
Corresponding Authors: Correspondence LIU Yong-sheng, Mobile: +86-18709832886, E-mail: liuyongsheng1122@hfut.edu.cn; TANG Wei, Mobile: +86-13339017320, E-mail: tangweitw@aliyun.com.cn   
About author: ZHANG Ya-bin, Mobile: +86-18227630935, E-mail: kiwifruitactinidia@163.com; * These authors contributed equally to this study.
Cite this article:   
ZHANG Ya-bin, TANG Wei, WANG Li-huan, HU Ya-wen, LIU Xian-wen, LIU Yong-sheng. 2019. Kiwifruit (Actinidia chinensis) R1R2R3-MYB transcription factor AcMYB3R enhances drought and salinity tolerance in Arabidopsis thaliana. Journal of Integrative Agriculture, 18(02): 417-427.
URL:  
http://www.chinaagrisci.com/Jwk_zgnykxen/EN/ 10.1016/S2095-3119(18)62127-6      or     http://www.chinaagrisci.com/Jwk_zgnykxen/EN/Y2019/V18/I02/417
 
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