title: Over-expression of TaMYB33 encoding a novel wheat MYB transcription factor increases salt and drought tolerance in Arabidopsis.
abstract: Salt and drought stresses often adversely affect plant growth and productivity, MYB transcription factors have been shown to participate in the response to these stresses. Here we identified a new R2R3-type MYB transcription factor gene TaMYB33 from wheat (Triticum aestivum). TaMYB33 was induced by NaCl, PEG and ABA treatments, and its promoter sequence contains putative ABRE, MYB and other abiotic stress related cis-elements. Ectopic over-expression of TaMYB33 in Arabidopsis thaliana remarkably enhanced its tolerance to drought and NaCl stresses, but not to LiCl and KCl treatments. The expressions of AtP5CS and AtZAT12 which mirror the activities of proline and ascorbate peroxidase synthesis respectively were induced in TaMYB33 over-expression lines, indicating TaMYB33 promotes the ability for osmotic pressure balance-reconstruction and reactive oxidative species (ROS) scavenging. The up-regulation of AtAAO3 along with down-regulation of AtABF3, AtABI1 in TaMYB33 over-expression lines indicated that ABA synthesis was elevated while its signaling was restricted. These results suggest that TaMYB33 enhances salt and drought tolerance partially through superior ability for osmotic balance reconstruction and ROS detoxification.
authors.affiliation: Department of Biological Science and Biotechnology, University of Jinan, Jinan, People's Republic of China. yuxiangqin@126.com
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Qin
authors.forename: Mengcheng
authors.initials: M
authors.lastname: Wang
authors.forename: Yanchen
authors.initials: Y
authors.lastname: Tian
authors.forename: Wenxing
authors.initials: W
authors.lastname: He
authors.forename: Lu
authors.initials: L
authors.lastname: Han
authors.forename: Guangmin
authors.initials: G
authors.lastname: Xia
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics / Q000502:physiology*; D003001:Cloning, Molecular; D055864:Droughts; D018506:Gene Expression Regulation, Plant; D024861:Genetic Enhancement; D008969:Molecular Sequence Data; D010802:Phylogeny; D010940:Plant Proteins / Q000096:biosynthesis / Q000235:genetics*; D030821:Plants, Genetically Modified; D011401:Promoter Regions, Genetic; D060888:Real-Time Polymerase Chain Reaction; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics; D055049:Salt Tolerance / Q000235:genetics*; D017422:Sequence Analysis, DNA; D013312:Stress, Physiological / Q000235:genetics*; D014157:Transcription Factors / Q000096:biosynthesis / Q000235:genetics*; D014158:Transcription, Genetic; D014908:Triticum / Q000235:genetics*
chemical_list: D010940:Plant Proteins; D011994:Recombinant Proteins; D014157:Transcription Factors