The interplay between cytokinins and light during senescence in detached Arabidopsis leaves
Language English Country United States Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
29744884
DOI
10.1111/pce.13329
Knihovny.cz E-resources
- Keywords
- AHK, ahk mutants, chlorophyll, malondialdehyde, photosystem II,
- MeSH
- Arabidopsis metabolism radiation effects MeSH
- Chlorophyll metabolism MeSH
- Cytokinins metabolism MeSH
- Photosystem II Protein Complex metabolism MeSH
- Plant Leaves metabolism radiation effects MeSH
- Malondialdehyde metabolism MeSH
- Lipid Peroxidation MeSH
- Aging metabolism radiation effects MeSH
- Light MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Chlorophyll MeSH
- Cytokinins MeSH
- Photosystem II Protein Complex MeSH
- Malondialdehyde MeSH
Light and cytokinins are known to be the key players in the regulation of plant senescence. In detached leaves, the retarding effect of light on senescence is well described; however, it is not clear to what extent is this effect connected with changes in endogenous cytokinin levels. We have performed a detailed analysis of changes in endogenous content of 29 cytokinin forms in detached leaves of Arabidopsis thaliana (wild-type and 3 cytokinin receptor double mutants). Leaves were kept under different light conditions, and changes in cytokinin content were correlated with changes in chlorophyll content, efficiency of photosystem II photochemistry, and lipid peroxidation. In leaves kept in darkness, we have observed decreased content of the most abundant cytokinin free bases and ribosides, but the content of cis-zeatin increased, which indicates the role of this cytokinin in the maintenance of basal leaf viability. Our findings underscore the importance of light conditions on the content of specific cytokinins, especially N6 -(Δ2 -isopentenyl)adenine. On the basis of our results, we present a scheme summarizing the contribution of the main active forms of cytokinins, cytokinin receptors, and light to senescence regulation. We conclude that light can compensate the disrupted cytokinin signalling in detached leaves.
References provided by Crossref.org
Photosystems under high light stress: throwing light on mechanism and adaptation
Role of Cytokinins in Senescence, Antioxidant Defence and Photosynthesis
Cytokinin at the Crossroads of Abiotic Stress Signalling Pathways
