Comparative Proteomic Analysis of Labellum and Inner Lateral Petals in Cymbidium ensifolium Flowers

文献类型： 外文期刊

第一作者： Li, Xiaobai

作者： Li, Xiaobai;Xu, Weiwei;Chowdhury, Moytri Roy;Jin, Feng

作者机构：

关键词： labellum;inner lateral petals;orchid;Cymbidium ensifolium;proteome

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN： 1422-0067

年卷期： 2014 年 15 卷 11 期

页码：

收录情况： SCI

摘要： The labellum in orchids shares homology with the inner lateral petals of the flower. The labellum is a modified petal and often distinguished from other petals and sepals due to its large size and irregular shape. Herein, we combined two-dimensional gel electrophoresis (2-DE) and matrix assisted laser desorption/ionization time of flight/time of flight (MALDI-TOF/TOF) approaches to identify the differentially expressed proteome between labellum and inner lateral petal in one of Orchid species (C. ensifolium). A total of 30 protein spots were identified, which showed more than a two-fold significant difference (p < 0.05) in their expression. Compared with C. ensifolium transcriptome (sequenced in house), 21 proteins matched the translated nucleotide. The proteins identified were classified into 48 categories according to gene ontology (GO). Additionally, these proteins were involved in 18 pathways and 9 possible protein-protein interactions. Serine carboxypeptidase and beta-glucosidase were involved in the phenylpropanoid pathway, which could regulate biosynthesis of floral scent components. Malate dehydrogenase (maeB) and triosephosphate isomerase (TPI) in carbon fixation pathway could regulate the energy metabolism. Xyloglucan endotransglucosylase/hydrolase (XET/XTH) could promote cell wall formation and aid the petal's morphogenesis. The identification of such differentially expressed proteins provides new targets for future studies; these will assess the proteins' physiological roles and significance in labellum and inner lateral petals.

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