title: A cotton miRNA is involved in regulation of plant response to salt stress.
abstract: The present study functionally identified a new microRNA (microRNA ovual line 5, miRNVL5) with its target gene GhCHR from cotton (Gossypium hirsutum). The sequence of miRNVL5 precursor is 104 nt long, with a well developed secondary structure. GhCHR contains two DC1 and three PHD Cys/His-rich domains, suggesting that GhCHR encodes a zinc-finger domain-containing transcription factor. miRNVL5 and GhCHR express at various developmental stages of cotton. Under salt stress (50-400 mM NaCl), miRNVL5 expression was repressed, with concomitant high expression of GhCHR in cotton seedlings. Ectopic expression of GhCHR in Arabidopsis conferred salt stress tolerance by reducing Na(+) accumulation in plants and improving primary root growth and biomass. Interestingly, Arabidopsis constitutively expressing miRNVL5 showed hypersensitivity to salt stress. A GhCHR orthorlous gene At2g44380 from Arabidopsis that can be cleaved by miRNVL5 was identified by degradome sequencing, but no confidential miRNVL5 homologs in Arabidopsis have been identified. Microarray analysis of miRNVL5 transgenic Arabidopsis showed six downstream genes (CBF1, CBF2, CBF3, ERF4, AT3G22920, and AT3G49200), which were induced by salt stress in wild-type but repressed in miRNVL5-expressing Arabidopsis. These results indicate that miRNVL5 is involved in regulation of plant response to salt stress.
authors.affiliation: Department of Biochemistry and Molecular Biology, College of Life Science, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Gao
authors.affiliation: Department of Biochemistry and Molecular Biology, College of Life Science, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Yang
authors.affiliation: College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China.
authors.forename: Hou Qing
authors.initials: HQ
authors.lastname: Zeng
authors.affiliation: College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing, China.
authors.forename: Zhao Sheng
authors.initials: ZS
authors.lastname: Zhou
authors.affiliation: Department of Biochemistry and Molecular Biology, College of Life Science, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Zhi Min
authors.initials: ZM
authors.lastname: Yang
authors.affiliation: Department of Biochemistry and Molecular Biology, College of Life Science, Nanjing Agricultural University, Nanjing 210095, China.|Department of Plant Science, College of Life Science, Henan Agricultural University, Henan 450002, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Biochemistry and Molecular Biology, College of Life Science, Nanjing Agricultural University, Nanjing 210095, China.|Department of Biochemistry and Biophysics, College of Agriculture and Life Sciences, Texas A&M University, TA 77843, USA.
authors.forename: Di
authors.initials: D
authors.lastname: Sun
authors.affiliation: Department of Biology, East Carolina University, Greenville, NC 27858, USA.
authors.forename: Fuliang
authors.initials: F
authors.lastname: Xie
authors.affiliation: Department of Biology, East Carolina University, Greenville, NC 27858, USA.
authors.forename: Baohong
authors.initials: B
authors.lastname: Zhang
mesh_terms: D017360:Arabidopsis / Q000235:genetics; D001483:Base Sequence; D001665:Binding Sites; D018506:Gene Expression Regulation, Plant; D053263:Gene Regulatory Networks; D017343:Genes, Plant; D003368:Gossypium / Q000235:genetics*; D035683:MicroRNAs / Q000235:genetics*; D005810:Multigene Family; D030821:Plants, Genetically Modified; D012333:RNA, Messenger / Q000737:chemistry / Q000235:genetics; D054712:Salinity; D055049:Salt Tolerance / Q000235:genetics*; D013312:Stress, Physiological / Q000235:genetics*; D016335:Zinc Fingers / Q000235:genetics
chemical_list: D035683:MicroRNAs; D012333:RNA, Messenger
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