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Functional characterization of a grape heat stress transcription factor VvHsfA9 in transgenic Arabidopsis

文献类型： 外文期刊

作者： Li, Zhenjun 1 ; Tian, Yongsheng 1 ; Zhao, Wei 1 ; Xu, Jing 1 ; Wang, Lijuan 1 ; Peng, Rihe 1 ; Yao, Quanhong 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Agrobiotechnol Res Inst, Shanghai Key Lab Agr Genet & Breeding, Shanghai 201106, Peoples R China

关键词： Flowering time;Grape;Heat stress transcription factor;Seed germination;Transcriptional activation domain

期刊名称：ACTA PHYSIOLOGIAE PLANTARUM （ 影响因子：2.354； 五年影响因子：2.711 ）

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收录情况： SCI

摘要： Plant heat stress transcription factor (HSF) family consists of a group of proteins participating in various signal transduction processes. However, only little information regarding HSF genes is available in grape. In this study, we reported the functional analysis of VvHsfA9 (Vitis vinifera HsfA9) in Arabidopsis. VvHsfA9 and HaHsfA9 (Helianthus annuus HsfA9) shared 34.72 % identity over the whole amino acid sequence. We discovered that the C-terminal part (VvHsfA9 262-340) is required for the transcriptional activation activity of VvHsfA9. Overexpression of VvHsfA9 in Arabidopsis confers enhanced seed germination under unstressed conditions and late-flowering phenotypes. However, no other stress tolerance was observed during post-germination stage. These results suggest that VvHsfA9 functions as a seed-specific transcription factor in positive modulation of seed germination and may negatively regulate flowering time of plants.

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