title: Abscisic acid refines the synthesis of chloroplast proteins in maize (Zea mays) in response to drought and light.
abstract: To better understand abscisic acid (ABA) regulation of the synthesis of chloroplast proteins in maize (Zea mays L.) in response to drought and light, we compared leaf proteome differences between maize ABA-deficient mutant vp5 and corresponding wild-type Vp5 green and etiolated seedlings exposed to drought stress. Proteins extracted from the leaves of Vp5 and vp5 seedlings were used for two-dimensional electrophoresis (2-DE) and subsequent matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry (MS). After Coomassie brilliant blue staining, approximately 450 protein spots were reproducibly detected on 2-DE gels. A total of 36 differentially expressed protein spots in response to drought and light were identified using MALDI-TOF MS and their subcellular localization was determined based on the annotation of reviewed accession in UniProt Knowledgebase and the software prediction. As a result, corresponding 13 proteins of the 24 differentially expressed protein spots were definitely localized in chloroplasts and their expression was in an ABA-dependent way, including 6 up-regulated by both drought and light, 5 up-regulated by drought but down-regulated by light, 5 up-regulated by light but down-regulated by drought; 5 proteins down-regulated by drought were mainly those involved in photosynthesis and ATP synthesis. Thus, the results in the present study supported the vital role of ABA in regulating the synthesis of drought- and/or light-induced proteins in maize chloroplasts and would facilitate the functional characterization of ABA-induced chloroplast proteins in C(4) plants.
authors.affiliation: Key Laboratory of Physiological Ecology and Genetic Improvement of Food Crops in Henan Province, Henan Agricultural University, Zhengzhou, China.
authors.forename: Xiuli
authors.initials: X
authors.lastname: Hu
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wu
authors.forename: Chaohai
authors.initials: C
authors.lastname: Li
authors.forename: Minghui
authors.initials: M
authors.lastname: Lu
authors.forename: Tianxue
authors.initials: T
authors.lastname: Liu
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology*; D002734:Chlorophyll / Q000378:metabolism; D060365:Chloroplast Proteins / Q000096:biosynthesis*; D002736:Chloroplasts / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects / Q000648:ultrastructure; D055864:Droughts; D015180:Electrophoresis, Gel, Two-Dimensional; D008027:Light; D009154:Mutation / Q000235:genetics; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects / Q000648:ultrastructure; D014176:Protein Biosynthesis / Q000187:drug effects* / Q000528:radiation effects; D040901:Proteomics; D003313:Zea mays / Q000187:drug effects* / Q000378:metabolism* / Q000528:radiation effects / Q000648:ultrastructure
chemical_list: D060365:Chloroplast Proteins; D002734:Chlorophyll; D000040:Abscisic Acid