The Roles of Environmental Factors in Regulation of Oxidative Stress in Plants
A special issue of Antioxidants (ISSN 2076-3921). This special issue belongs to the section "ROS, RNS and RSS".
Deadline for manuscript submissions: closed (15 November 2024) | Viewed by 15066
Special Issue Editor
Interests: abiotic stress; reactive oxygen species; plants growing; drought; precipitation; climate
Special Issue Information
Dear Colleagues,
Chloroplasts play pivotal roles in biotic and abiotic stress responses, which involve changes in the cellular reduction–oxidation state. Levels of the nonexpressor of pathogenesis-related genes 1 (NPR1) protein are markedly elevated in chloroplasts under salinity stress. Chloroplast-targeted NPR1 overexpression enhances stress tolerance and photosynthetic capacity. These functions are related to chloroplast NPR1 acting not only as a scavenger of stress-damaged proteins such as RuBisCo large subunit (RbcL), but also as a chaperone for chloroplast proteostasis. Additionally, NPR1 localized in the chloroplast and cytoplasm exhibits antioxidant and chaperone functions, whereas nuclear NPR1 does not. Conformational characteristics are considered to be different depending on the localization of NPR1. In immunoblotting and fluorescence image analyses, chloroplast-targeted NPR1 was detected in the nucleus, suggesting dual localization or translocation from the chloroplast to the nucleus. Nuclear NPR1 levels were increased following treatment with H2O2 and an ethylene precursor in transgenic plants with chloroplast-targeted NPR1. Specifically, nuclear NPR1 was significantly increased in dark-induced senescent leaves in those transgenic lines. Taken together, these findings indicate that chloroplast NPR1 translocates to the nucleus, realizing a retrograde signalling process that transmits chloroplast information to the nucleus to elicit an adaptive response to stress. ROS-sensitive NPR1 proteins that oxidize cysteine residues function as redox switches in response to abiotic and biotic stresses. Papers regarding environmental factors in the regulation of oxidative stress in plants are welcome in this Special Issue.
Dr. Ky Young Park
Guest Editor
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Keywords
- chloroplast retrograde signalling
- reactive oxygen species (ROS)
- nonexpressor of pathogenesis-related genes 1 (NPR1)
- senescence
- salt stress
- antioxidant
- circadian rhythm
- cystine-based redox machinery
- ethylene
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