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KMID : 0368420080510010011
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Journal of Plant Biology
2008 Volume.51 No. 1 p.11 ~ p.19
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Protein degradation and nitrogen remobilization during leaf senescence
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Liu Juan
Wu Yun Hai
Yang Jun Jie
Liu Yu Dong
Shen Fa Fu
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Abstract
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Leaf senescence, a type of programmed cell death, is a complex and highly regulated process that involves the degradation of macromolecules, including proteins, nucleic acids, and lipids. Nutrients, especially nitrogen, are re-mobilized from senescing leaves to newly developing tissues or reserve organs. Our review focuses on three pathways for protein breakdown and the resorption of N during this process: the ubiquitin/proteosome system, the chloroplast degradation pathway, and the vacuolar and autophagic pathway. We propose that two relative biochemical cycles exist for amino acid recycling and N-export ? the GS/GOGAT cycle and the PPDK-GS/GOGAT cycle.
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KEYWORD
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CS/COGAT pathway, leaf senescence, nitrogen (N) resorption, PPDK-CS/GOGAT pathway, programmed cell death (PCD), protein degradation
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