title: Proteomic analysis of somatic embryogenesis in Valencia sweet orange (Citrus sinensis Osbeck).
abstract: Two dimensional gel electrophoresis combined with matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) was employed to study the somatic embryogenesis (SE) in Valencia sweet orange (Citrus sinensis Osbeck). Twenty-four differentially expressed proteins were identified at five time points of citrus SE (0, 1, 2, 3, 4 weeks after embryo initiation) covering globular, heart/torpedo and cotyledon-shaped embryo stages. The general expression patterns for these proteins were consistent with those appeared at 4 weeks of citrus SE. The most striking feature of our study was that five proteins were predicted to be involved in glutathione (GSH) metabolism and anti-oxidative stress, and they exhibited different expression patterns during SE. Based on that oxidative stress has been validated to enhance SE, the preferential representation for anti-oxidative proteins suggests that they could have a developmental role in citrus SE. Some proteins involved in cell division, photosynthesis and detoxification were also identified, and their possible roles in citrus SE were discussed.
authors.affiliation: National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, People's Republic of China. zypan@webmail.hzau.edu.cn
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Pan
authors.forename: Rui
authors.initials: R
authors.lastname: Guan
authors.forename: Shiping
authors.initials: S
authors.lastname: Zhu
authors.forename: Xiuxin
authors.initials: X
authors.lastname: Deng
mesh_terms: D032084:Citrus sinensis / Q000196:embryology* / Q000378:metabolism*; D015180:Electrophoresis, Gel, Two-Dimensional; D018506:Gene Expression Regulation, Plant; D010940:Plant Proteins / Q000378:metabolism; D040901:Proteomics / Q000379:methods*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D010940:Plant Proteins