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Progress in Physiological Functions and Molecular Regulations of Endoreduplication in Higher Plants
Li-Li Dong, Hui Shi, Li-Ping Chen*
Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029, China
Abstract: Endoreduplication is a kind of special cell cycle which regulates cell growth through increasing the expression of related genes and the synthesis of cytoplasmic substances. It also has some advantages for further cell differentiation in order to fulfill concrete physiological functions， such as accumulation of nutrient substance， nitrogen fixation， stress accommodation and so on. Compared with normal cell cycle， distinct and exquisite modifications are made during the process of endoreduplication. M phase CDK activities are depressed while S phase CDK express periodically with normal or higher activities， hence cells are leaded to DNA replication phase repeatedly. Besides， RB/E2F， APC/C and other pathways are also involved in the molecular regulation of endoreduplication. In a word， a whole coherent and harmonious network accomplishes the consecutive transition of cell cycle phases and guarantees the whole process to be orderly operated.
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