title: Overexpression of AT14A confers tolerance to drought stress-induced oxidative damage in suspension cultured cells of Arabidopsis thaliana.
abstract: Drought stress can affect interaction between plant cell plasma membrane and cell wall. Arabidopsis AT14A, an integrin-like protein, mediates the cell wall-plasma membrane-cytoskeleton continuum (WMC continuum). To gain further insight into the function of AT14A, the role of AT14A in response to drought stress simulated by polyethylene glycol (PEG-6000) in Arabidopsis suspension cultures was investigated. The expression of this gene was induced by PEG-6000 resulting from reverse transcription-PCR, which was further confirmed by the expression data from publically available microarray datasets. Compared to the wild-type cells, overexpression of AT14A (AT14A-OE) in Arabidopsis cultures exhibited a greater ability to adapt to water deficit, as evidenced by higher biomass accumulation and cell survival rate. Furthermore, AT14A-OE cells showed a higher tolerance to PEG-induced oxidative damage, as reflected by less H2O2 content, lipid peroxidation (malondialdehyde (MDA) content), and ion leakage, which was further verified by maintaining high levels of activities of antioxidant defense enzymes such as ascorbate peroxidase and guaiacol peroxidase and soluble protein. Taken together, our results suggest that overexpression of AT14A improves drought stress tolerance and that AT14A is involved in suppressing oxidative damage under drought stress in part via regulation of antioxidant enzyme activities.
authors.affiliation: Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China, linlwang@163.com.
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: He
authors.forename: Haidong
authors.initials: H
authors.lastname: Ding
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.forename: Bing
authors.initials: B
authors.lastname: Lü
authors.forename: Jiansheng
authors.initials: J
authors.lastname: Liang
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.forename: J
authors.initials: J
authors.lastname: He
authors.forename: H D
authors.initials: HD
authors.lastname: Ding
authors.forename: H
authors.initials: H
authors.lastname: Liu
authors.forename: B
authors.initials: B
authors.lastname: Lü
authors.forename: J S
authors.initials: JS
authors.lastname: Liang
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000235:genetics; D015227:Lipid Peroxidation / Q000187:drug effects / Q000235:genetics; D030821:Plants, Genetically Modified / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D011092:Polyethylene Glycols / Q000494:pharmacology
chemical_list: D029681:Arabidopsis Proteins; C118912:At14a protein, Arabidopsis; D011092:Polyethylene Glycols