Back to Search
Start Over
Autophagy Increases Zinc Bioavailability to Avoid Light-Mediated Reactive Oxygen Species Production under Zinc Deficiency
- Source :
- Plant Physiology, Plant Physiology, American Society of Plant Biologists, 2020, 182 (3), pp.1284-1296. ⟨10.1104/pp.19.01522⟩
- Publication Year :
- 2020
- Publisher :
- HAL CCSD, 2020.
-
Abstract
- Zinc (Zn) is an essential micronutrient for plant growth. Accordingly, Zn deficiency (−Zn) in agricultural fields is a serious problem, especially in developing regions. Autophagy, a major intracellular degradation system in eukaryotes, plays important roles in nutrient recycling under nitrogen and carbon starvation. However, the relationship between autophagy and deficiencies of other essential elements remains poorly understood, especially in plants. In this study, we focused on Zn due to the property that within cells most Zn is tightly bound to proteins, which can be targets of autophagy. We found that autophagy plays a critical role during −Zn in Arabidopsis (Arabidopsis thaliana). Autophagy-defective plants (atg mutants) failed to grow and developed accelerated chlorosis under −Zn. As expected, −Zn induced autophagy in wild-type plants, whereas in atg mutants, various organelle proteins accumulated to high levels. Additionally, the amount of free Zn(2+) was lower in atg mutants than in control plants. Interestingly, −Zn symptoms in atg mutants recovered under low-light, iron-limited conditions. The levels of hydroxyl radicals in chloroplasts were elevated, and the levels of superoxide were reduced in −Zn atg mutants. These results imply that the photosynthesis-mediated Fenton-like reaction, which is responsible for the chlorotic symptom of −Zn, is accelerated in atg mutants. Together, our data indicate that autophagic degradation plays important functions in maintaining Zn pools to increase Zn bioavailability and maintain reactive oxygen species homeostasis under −Zn in plants.
- Subjects :
- 0106 biological sciences
Chloroplasts
Physiology
[SDV]Life Sciences [q-bio]
Mutant
Arabidopsis
Plant Science
01 natural sciences
chemistry.chemical_compound
Gene Expression Regulation, Plant
Zinc deficiency (plant disorder)
Genetics
Autophagy
Arabidopsis thaliana
Research Articles
2. Zero hunger
chemistry.chemical_classification
Reactive oxygen species
biology
Chemistry
Superoxide
Arabidopsis Proteins
biology.organism_classification
Cell biology
Chloroplast
Zinc
Reactive Oxygen Species
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 00320889 and 15322548
- Database :
- OpenAIRE
- Journal :
- Plant Physiology, Plant Physiology, American Society of Plant Biologists, 2020, 182 (3), pp.1284-1296. ⟨10.1104/pp.19.01522⟩
- Accession number :
- edsair.doi.dedup.....97a0d0727365b952733b1b112f8c8e58