title: Physiological, Ultrastructural and Proteomic Responses in the Leaf of Maize Seedlings to Polyethylene Glycol-Stimulated Severe Water Deficiency.
abstract: After maize seedlings grown in full-strength Hoagland solution for 20 days were exposed to 20% polyethylene glycol (PEG)-stimulated water deficiency for two days, plant height, shoot fresh and dry weights, and pigment contents significantly decreased, whereas malondialdehyde (MDA) content greatly increased. Using transmission electron microscopy, we observed that chloroplasts of mesophyll cells in PEG-treated maize seedlings were swollen, with a disintegrating envelope and disrupted grana thylakoid lamellae. Using two-dimensional gel electrophoresis (2-DE) method, we were able to identify 22 protein spots with significantly altered abundance in the leaves of treated seedlings in response to water deficiency, 16 of which were successfully identified. These protein species were functionally classified into signal transduction, stress defense, carbohydrate metabolism, protein metabolism, and unknown categories. The change in the abundance of the identified protein species may be closely related to the phenotypic and physiological changes due to PEG-stimulated water deficiency. Most of the identified protein species were putatively located in chloroplasts, indicating that chloroplasts may be prone to damage by PEG stimulated-water deficiency in maize seedlings. Our results help clarify the molecular mechanisms of the responses of higher plants to severe water deficiency.
authors.affiliation: The Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University, Zhengzhou 450002, China. shao_rui_xin@126.com.|The National Key Laboratory of Wheat and Maize Crop Science, Henan Agricultural University, Zhengzhou 450002, China. shao_rui_xin@126.com.
authors.forename: Ruixin
authors.initials: R
authors.lastname: Shao
authors.affiliation: The National Key Laboratory of Wheat and Maize Crop Science, Henan Agricultural University, Zhengzhou 450002, China. cnxinlongfei@126.com.
authors.forename: Longfei
authors.initials: L
authors.lastname: Xin
authors.affiliation: The National Key Laboratory of Wheat and Maize Crop Science, Henan Agricultural University, Zhengzhou 450002, China. mlsrmj3@163.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Mao
authors.affiliation: The National Key Laboratory of Wheat and Maize Crop Science, Henan Agricultural University, Zhengzhou 450002, China. shaorx2012@163.com.
authors.forename: Leilei
authors.initials: L
authors.lastname: Li
authors.affiliation: The Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University, Zhengzhou 450002, China. zkangg@163.com.
authors.forename: Guozhang
authors.initials: G
authors.lastname: Kang
authors.affiliation: The National Key Laboratory of Wheat and Maize Crop Science, Henan Agricultural University, Zhengzhou 450002, China. yangqh1207@sina.com.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Yang
mesh_terms: D042541:Intracellular Space; D018515:Plant Leaves / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure*; D011092:Polyethylene Glycols / Q000378:metabolism* / Q000494:pharmacology; D021381:Protein Transport; D020543:Proteome; D040901:Proteomics / Q000379:methods; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D013312:Stress, Physiological / Q000235:genetics; D003313:Zea mays / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*
chemical_list: D020543:Proteome; D012333:RNA, Messenger; D011092:Polyethylene Glycols
keywords: Zea mays L.; differentially expressed proteins; proteome; ultrastructure; water deficiency