24-epibrassinolide and 20-hydroxyecdysone affect photosynthesis differently in maize and spinach
Language English Country United States Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
24769061
DOI
10.1016/j.steroids.2014.04.006
PII: S0039-128X(14)00077-4
Knihovny.cz E-resources
- Keywords
- Brassinosteroids, Chlorophyll, Ecdysteroids, Gas exchange, OJIP analysis, Photosynthetic electron transport,
- MeSH
- Brassinosteroids administration & dosage MeSH
- Ecdysterone administration & dosage MeSH
- Photosynthesis drug effects genetics MeSH
- Photosystem II Protein Complex drug effects genetics MeSH
- Zea mays drug effects growth & development MeSH
- Plant Leaves drug effects metabolism MeSH
- Oxidation-Reduction MeSH
- Plant Proteins biosynthesis MeSH
- Spinacia oleracea drug effects growth & development MeSH
- Steroids, Heterocyclic administration & dosage MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- brassinolide MeSH Browser
- Brassinosteroids MeSH
- Ecdysterone MeSH
- Photosystem II Protein Complex MeSH
- Plant Proteins MeSH
- Steroids, Heterocyclic MeSH
The aim of the work was to examine the effect of brassinosteroid (24-epibrassinolide; 24E) and ecdysteroid (20-hydroxyecdysone; 20E) on various parts of primary photosynthetic processes in maize and spinach. Additionally, the effect of steroids on gaseous exchange, pigment content and biomass accumulation was studied. The efficiency of the photosynthetic whole electron-transport chain responded negatively to the 24E or 20E treatment in both species, but there were interspecific differences regarding Photosystem (PS) II response. A positive effect on its oxygen-evolving complex and a slightly better energetical connectivity between PSII units were observed in maize whereas the opposite was true for spinach. The size of the pool of the PSI end electron acceptors was usually diminished due to 24E or 20E treatment. The treatment of plants with 24E or 20E applied individually positively influenced the content of photosynthetic pigments in maize (not in spinach). On the other hand, it did not affect gaseous exchange in maize but resulted in its reduction in spinach. Plants treated with combination of both steroids mostly did not significantly differ from the control plants. We have demonstrated for the first time that 20E applied in low (10nM) concentration can affect various parts of photosynthetic processes similarly to 24E and that brassinosteroids regulate not only PSII but also other parts of the photosynthetic electron transport chain - but not necessarily in the same way.
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