title: Overexpression of Actinidia deliciosa pyruvate decarboxylase 1 gene enhances waterlogging stress in transgenic Arabidopsis thaliana.
abstract: Ethanolic fermentation is classically associated with waterlogging tolerance when plant cells switch from respiration to anaerobic fermentation. Pyruvate decarboxylase (PDC), which catalyzes the first step in this pathway, is thought to be the main regulatory enzyme. Here, we cloned a full-length PDC cDNA sequence from kiwifruit, named AdPDC1. We determined the expression of the AdPDC1 gene in kiwifruit under different environmental stresses using qRT-PCR, and the results showed that the increase of AdPDC1 expression during waterlogging stress was much higher than that during salt, cold, heat and drought stresses. Overexpression of kiwifruit AdPDC1 in transgenic Arabidopsis enhanced the resistance to waterlogging stress but could not enhance resistance to cold stress at five weeks old seedlings. Overexpression of kiwifruit AdPDC1 in transgenic Arabidopsis could not enhance resistance to NaCl and mannitol stresses at the stage of seed germination and in early seedlings. These results suggested that the kiwifruit AdPDC1 gene is required during waterlogging but might not be required during other environmental stresses. Expression of the AdPDC1 gene was down-regulated by abscisic acid (ABA) in kiwifruit, and overexpression of the AdPDC1 gene in Arabidopsis inhibited seed germination and root length under ABA treatment, indicating that ABA might negatively regulate the AdPDC1 gene under waterlogging stress.
authors.affiliation: Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China. Electronic address: maxzhangjy@163.com.
authors.forename: Ji-Yu
authors.initials: JY
authors.lastname: Zhang
authors.affiliation: Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China.
authors.forename: Sheng-Nan
authors.initials: SN
authors.lastname: Huang
authors.affiliation: Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
authors.affiliation: Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China.
authors.forename: Ji-Ping
authors.initials: JP
authors.lastname: Xuan
authors.affiliation: Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China. Electronic address: zhongrenguo@cnbg.net.
authors.forename: Zhong-Ren
authors.initials: ZR
authors.lastname: Guo
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology; D029042:Actinidia / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics*; D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics* / Q000502:physiology*; D003001:Cloning, Molecular; D003080:Cold Temperature; D055868:Floods; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D017343:Genes, Plant; D018525:Germination / Q000187:drug effects; D008353:Mannitol / Q000494:pharmacology; D010641:Phenotype; D018517:Plant Roots / Q000033:anatomy & histology / Q000187:drug effects / Q000235:genetics; D030821:Plants, Genetically Modified; D011767:Pyruvate Decarboxylase / Q000235:genetics* / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects / Q000502:physiology; D012965:Sodium Chloride / Q000494:pharmacology; D013312:Stress, Physiological / Q000187:drug effects / Q000235:genetics*
chemical_list: D008353:Mannitol; D012965:Sodium Chloride; D000040:Abscisic Acid; D011767:Pyruvate Decarboxylase
keywords: ABA; Environmental stresses; Kiwifruit; Pyruvate decarboxylase 1 gene; Transgenic plants; Waterlogging stress