Chloroplast stress signals: regulation of cellular degradation and chloroplast turnover.
Curr Opin Plant Biol
; 52: 30-37, 2019 12.
Article
em En
| MEDLINE
| ID: mdl-31442733
ABSTRACT
For 40 years, it has been known that chloroplasts signal to the nucleus and the cell to coordinate gene expression, maximize photosynthesis, and avoid stress. However, the signaling mechanisms have been challenging to uncover due to the complexity of these signals and the stresses that induce them. New research has shown that many signals are induced by singlet oxygen, a natural by-product of inefficient photosynthesis. Chloroplast singlet oxygen not only regulates nuclear gene expression, but also cellular degradation and cell death. Stressed chloroplasts also induce post-translational mechanisms, including autophagy, that allows individual chloroplasts to regulate their own degradation and turnover. Such chloroplast quality control pathways may allow cells to maintain healthy populations of chloroplasts and to avoid cumulative photo-oxidative stress in stressful environments.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Autofagia
/
Cloroplastos
Idioma:
En
Revista:
Curr Opin Plant Biol
Assunto da revista:
BOTANICA
Ano de publicação:
2019
Tipo de documento:
Article