Chloroplasts are photosynthetic green plastids characterized by the intricate three-dimensional structure of thylakoid networks in higher plant. Disassembly of the thylakoid membranes is the first step leading to chloroplast degradation, nevertheless the degradation processes involved is not understood. Chloroplast membranes contain four major polar acryl lipids including uncharged galactolipids digalactosyldiacylglycerol (DGDG) and monogalactosyldiacylglycerol (MGDG), and negatively charged phospholipids mainly phosphatidylglycerol (PtdPG) and sulpholipid, sulphoquinovosyldiacylglycerol (SQDQ). Two function groups of enzymes, glycosyl hydrolases and lipases, are involved in the hydrolysis of these lipids based on chemical structures of these polar lipids. We used Arabidopsis as model plant. In this study, we analyzed the expression patterns of all the putative glycosyl hydrolases capable of hydrolyze the thylakoid membranes including 6 α-galactosidases (EC 3.2.1.22), 18 β-galactosidases (EC 3.2.1.23) and 2 α-D-glucosidases (EC 3.2.1.20) during different stages of leaf development and senescence. We also have retrieved 2500 nuclear genes encoding chloroplast protein in the Arabidopsis genome. ~ 100 of these proteins were selected for further analysis aim to identify proteins responsible for initial degradation of thylakoid membranes inside the chloroplast.The expression patterns of these genes analyzed by using RT-PCR during leaf growth and senescence were investigated using rosette leaves after 6 – 16 week of sowing were presented and discussed.

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