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Title of Journal: Acta Physiol Plant

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Abbravation: Acta Physiologiae Plantarum

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Springer Berlin Heidelberg

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DOI

10.1007/978-3-8348-2072-3_2

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ISSN

1861-1664

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Exogenous 78dihydro8α20hydroxyecdysone applic

Authors: Weerasin Sonjaroon Lily Kaveeta Witit Chaiarree Sasithorn Klinsakorn Apichart Suksamrarn Kanapol Jutamanee
Publish Date: 2016/07/27
Volume: 38, Issue: 8, Pages: 202-
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Abstract

78Dihydro8α20hydroxyecdysone 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 hightemperature 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 DHECDelevated 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 nonphotochemical quenching Thus enhancement of photosynthesis by DHECD application resulted in a high grain yield for rice plants subjected to hightemperature conditions

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