Author:
Springer Armin,Kang ChulHee,Rustgi Sachin,von Wettstein Diter,Reinbothe Christiane,Pollmann Stephan,Reinbothe Steffen
Abstract
Leaf senescence is the terminal stage in the development of perennial plants. Massive physiological changes occur that lead to the shut down of photosynthesis and a cessation of growth. Leaf senescence involves the selective destruction of the chloroplast as the site of photosynthesis. Here, we show that 13-lipoxygenase (13-LOX) accomplishes a key role in the destruction of chloroplasts in senescing plants and propose a critical role of its NH2-terminal chloroplast transit peptide. The 13-LOX enzyme identified here accumulated in the plastid envelope and catalyzed the dioxygenation of unsaturated membrane fatty acids, leading to a selective destruction of the chloroplast and the release of stromal constituents. Because 13-LOX pathway products comprise compounds involved in insect deterrence and pathogen defense (volatile aldehydes and oxylipins), a mechanism of unmolested nitrogen and carbon relocation is suggested that occurs from leaves to seeds and roots during fall.
Funder
German Science Foundation
Marie-Curie grant of the European Communion
Publisher
Proceedings of the National Academy of Sciences
Reference52 articles.
1. Leaf Senescence: Signals, Execution, and Regulation
2. Reinbothe C Reinbothe S (2005) Regulation of photosynthetic gene expression by the environment: From seedling de-etiolation to leaf senescence, Photoprotection, Photoinhibition, Gene Regulation, and Environment, eds Demmig-Adams B, Adams W, III, Mattoo A, Advances in Photosynthesis and Respiration, series ed. Govidjee B (Springer, Dordrecht, The Netherlands), Vol 21, pp 333–365
3. Phytohormones and microRNAs as sensors and regulators of leaf senescence: Assigning macro roles to small molecules
4. The complex regulation of WRKY53 during leaf senescence of Arabidopsis thaliana
5. Members of the barley NAC transcription factor gene family show differential co-regulation with senescence-associated genes during senescence of flag leaves
Cited by
47 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献