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Cloning of the strawberry xanthophyll cycle genes VDE and ZEP and characterization of their responses to high light stress

文献类型： 外文期刊

作者： Zhu, Haisheng 1 ; Chen, Mindong 1 ; Bin, Wang 1 ; Wen, Qingfang 1 ;

作者机构： 1.Fujian Acad Agr Sci, Vegetable Res Ctr, Crops Res Inst, Fuzhou, Fujian, Peoples R China

关键词： Fragaria x ananassa;gene expression;high light;regulatory mechanism;violaxanthin de-epoxidase;zeaxanthin epoxidase

期刊名称：EUROPEAN JOURNAL OF HORTICULTURAL SCIENCE （ 影响因子：1.482； 五年影响因子：1.503 ）

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收录情况： SCI

摘要： The xanthophyll cycle is associated with the violaxanthin de-epoxidase (VDE)-catalyzed conversion of violaxanthin (V) to zeaxanthin (Z) via antheraxanthin (A) when plants are exposed to excess light energy Zeaxanthin is reversibly converted to V by zeaxanthin epoxidase (ZEP) under non -saturated light conditions. In this study, the strawberry VDE and ZEP cDNA sequences were isolated. Additionally, the changes in Z, V, and A contents and VDE and ZEP expression levels under high light and dark conditions were characterized to investigate the regulation of VDE and ZEP expression in response to high light stress in strawberry leaves. Under high light conditions, the VDE expression level increased considerably during the first 10 min, after which it slowly increased. When leaves were placed in darkness, the VDE expression level decreased immediately. The VDE expression profile was consistent with the observed changes to the Z content and the de-epoxidation state of the xanthophyll cycle [i.e., (Z + A) / (Z + A + V)]. The ZEP transcript level decreased after a 10 -min exposure to high light conditions, but then gradually increased. Following a 10 min incubation in darkness, the ZEP expression level increased and then decreased to control levels. The changes in ZEP expression during the first 10 min of exposure to high light and dark conditions were consistent with the accumulation of V. These results indicate that the rapid responses of the strawberry xanthophyll cycle components to high light stress appears to be regulated by gene expression level changes.

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