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Protein degradation and nitrogen remobilization during leaf senescence

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Abstract

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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  1. State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, 271018, Taian, Shandong, China

    Juan Liu, Yun Hai Wu, Jun Jie Yang, Yu Dong Liu & Fa Fu Shen

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Liu, J., Wu, Y.H., Yang, J.J. et al. Protein degradation and nitrogen remobilization during leaf senescence. J. Plant Biol. 51, 11–19 (2008). https://doi.org/10.1007/BF03030735

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