title: Ectopic overexpression of a novel Glycine soja stress-induced plasma membrane intrinsic protein increases sensitivity to salt and dehydration in transgenic Arabidopsis thaliana plants.
abstract: Plasma membrane intrinsic proteins (PIPs) belong to the aquaporin family and facilitate water movement across plasma membranes. Existing data indicate that PIP genes are associated with the abilities of plants to tolerate certain stress conditions. A review of our Glycine soja expressed sequence tag (EST) dataset revealed that abiotic stress stimulated expression of a PIP, herein designated as GsPIP2;1 (GenBank_Accn: FJ825766). To understand the roles of this PIP in stress tolerance, we generated a coding sequence for GsPIP2;1 by in silico elongation and cloned the cDNA by 5'-RACE. Semiquantitative RT-PCR showed that GsPIP2;1 expression was stimulated in G. soja leaves by cold, salt, or dehydration stress, whereas the same stresses suppressed GsPIP2;1 expression in the roots. Transgenic Arabidopsis thaliana plants overexpressing GsPIP2;1 grew normally under unstressed and cold conditions, but exhibited depressed tolerance to salt and dehydration stresses. Moreover, greater changes in water potential were detected in the transgenic A. thaliana shoots, implying that GsPIP2;1 may negatively impact stress tolerance by regulating water potential. These results, deviating from those obtained in previous reports, provide new insights into the relationship between PIPs and abiotic stress tolerance in plants.
authors.affiliation: The Key Laboratory of Sugar Beet Genetic Breeding, Colleges of Heilongjiang Province, Heilongjiang University, No. 74 XueFu Road, NanGang District, Harbin, 150080, Heilongjiang, China, lagow@163.com.
authors.forename: Xi
authors.initials: X
authors.lastname: Wang
authors.forename: Hua
authors.initials: H
authors.lastname: Cai
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.forename: Yanming
authors.initials: Y
authors.lastname: Zhu
authors.forename: Wei
authors.initials: W
authors.lastname: Ji
authors.forename: Xi
authors.initials: X
authors.lastname: Bai
authors.forename: Dan
authors.initials: D
authors.lastname: Zhu
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Sun
mesh_terms: D020346:Aquaporins / Q000302:isolation & purification / Q000378:metabolism*; D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics / Q000254:growth & development / Q000502:physiology*; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism*; D003080:Cold Temperature; D003681:Dehydration; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D030821:Plants, Genetically Modified; D036226:Seedlings / Q000187:drug effects / Q000235:genetics; D012965:Sodium Chloride / Q000494:pharmacology*; D013025:Glycine max / Q000378:metabolism*; D013312:Stress, Physiological / Q000187:drug effects*
chemical_list: D020346:Aquaporins; D010940:Plant Proteins; D012965:Sodium Chloride