Abstract
7,8-Dihydro-8α-20-hydroxyecdysone (DHECD) has biological activity similar to brassinosteroids. In this study, we investigated the role of DHECD on the antioxidative enzyme activity and photosynthetic performance of rice subjected to high-temperature conditions. DHECD at either 1 or 10 µM was used as a foliar application to rice leaves at 23 days after sowing, and then, at 31 days after sowing, rice plants were moved to a heat chamber at 40/30 °C day/night for 9 days. Application of DHECD significantly increased the activities of the antioxidative enzymes: superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase. The results of this study provide the first direct evident for DHECD-elevated antioxidative enzyme activity and decreased lipid peroxidation, which possibly induced thermotolerance in rice plants. Furthermore, DHECD was effective in increasing the net photosynthetic rate, stomatal conductance, and water use efficiency, as well as increasing the maximal quantum efficiency of photosystem II and decreasing non-photochemical quenching. Thus, enhancement of photosynthesis by DHECD application resulted in a high grain yield for rice plants subjected to high-temperature conditions.
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Abbreviations
- APX:
-
Ascorbate peroxidase
- BRs:
-
Brassinosteroids
- CAT:
-
Catalase
- DHECD:
-
7,8-Dihydro-8α-20-hydroxyecdysone
- Fv/Fm:
-
Maximal photochemical efficiency of PSII
- g s :
-
Stomatal conductance
- MDA:
-
Malondialdehyde
- P N :
-
Net photosynthetic rate
- POD:
-
Peroxidase
- ΦPSII:
-
Actual photochemical efficiency of PSII
- qN:
-
Non-photochemical quenching
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
- WUE:
-
Water use efficiency
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Acknowledgments
This work was supported by Kasetsart University, Thailand. Partial support from the Center of Excellence for Innovation in Chemistry, Office of the Higher Education Commission, Thailand is gratefully acknowledged.
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Sonjaroon, W., Kaveeta, L., Chai-arree, W. et al. Exogenous 7,8-dihydro-8α-20-hydroxyecdysone application improves antioxidative enzyme system, photosynthesis, and yield in rice under high-temperature condition. Acta Physiol Plant 38, 202 (2016). https://doi.org/10.1007/s11738-016-2205-8
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DOI: https://doi.org/10.1007/s11738-016-2205-8