Auxin response factor gene MdARF2 is involved in ABA signaling and salt stress response in apple  

作　　者：WANG Chu-kun ZHAO Yu-wen HAN Peng-liang YU Jian-qiang HAO Yu-jin XU Qian YOU Chun-xiang HU Da-gang 

机构地区：[1]National Key Laboratory of Crop Biology/Shandong Collaborative Innovation Center of Fruit&Vegetable Quality and Efficient Production,College of Horticultural Science and Engineering,Shandong Agricultural University,Tai’an 271018,P.R.China [2]State Key Laboratory of Crop Stress Biology for Arid Areas,College of Plant Protection,Northwest A&F University,Yangling 712100,P.R.China [3]State Key Laboratory of Crop Biology,College of Agronomy,Shandong Agricultural University,Tai’an 271018,P.R.China

出　　处：《Journal of Integrative Agriculture》2022年第8期2264-2274,共11页农业科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(2018YFD1000200);the National Natural Science Foundation of China(31972375 and 31801330);the Outstanding Youth Fund of Shandong Province,China(ZR2020YQ25 and SDAIT-06-03)。

摘　　要：Auxin response factors(ARFs)play key roles throughout the whole process of plant growth and development,and mediate auxin response gene transcription by directly binding with auxin response elements(AuxREs).However,their functions in abiotic stresses are largely limited,especially in apples.Here,the auxin response factor gene MdARF2(HF41569)was cloned from apple cultivar‘Royal Gala’(Malus×domestica Borkh.).Phylogenetic analysis showed that ARF2 proteins are highly conserved among different species and MdARF2 is the closest relative to PpARF2 of Prunus persica,but they differ at the DNA level.MdARF2 contains three typical conserved domains including the B3 DNAbinding domain,Auxin_resp domain and AUX_IAA domain.The subcellular localization demonstrated that MdARF2 is localized in the nucleus.The three-dimensional structure prediction of the proteins showed that MdARF2 is highly similar with AtARF2,and they contain helices,folds,and random coils.The promoter of MdARF2 contains cis-acting elements which respond to various stresses,as well as environmental and hormonal signals.Expression analysis showed that MdARF2 is widely expressed in all tissues of apple,with the highest expression of MdARF2 in root.Functional analysis with a series of MdARF2 transgenic apple calli indicated that MdARF2 can reduce the sensitivity to ABA signaling and enhance salt tolerance in apple.In summary,the results of this research provide a new basis for studying the regulation of abiotic stresses by ARFs.

关 键 词：ABA signaling APPLE MdARF2 salt stress 

分 类 号：S661.1[农业科学—果树学]