期刊
JOURNAL OF PLANT BIOLOGY
卷 51, 期 1, 页码 11-19出版社
SPRINGER HEIDELBERG
DOI: 10.1007/BF03030735
关键词
GS/GOGAT pathway; leaf senescence; nitrogen (N) resorption; PPDK-GS/GOGAT pathway; programmed cell death (PCD); protein degradation
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 IN 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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