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Functional analysis of FLOWERING LOCUS T orthologs from spring orchid (Cymbidium goeringii Rchb. f.) that regulates the vegetative to reproductive transition

文献类型： 外文期刊

作者： Xiang, Lin 1 ; Li, Xiaobai 1 ; Qin, Dehui 1 ; Guo, Fangqi 1 ; Wu, Chao 1 ; Miao, Lixiang 1 ; Sun, Chongbo 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Hort, Hangzhou 310021, Zhejiang, Peoples R China

关键词： Flower induction;FLOWERING LOCUS T (FT);Gene expression;Spring orchid;Tobacco

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

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收录情况： SCI

摘要： The FLOWERING LOCUS T (. FT) gene plays crucial roles in regulating the vegetative-to-reproductive phase transition. The. FT-like gene of spring orchid (. Cymbidium goeringii Rchb. f.),. CgFT, was isolated and characterized. CgFT mRNA was detected in leaves, pseudobulb, and flowers. In flowers, Cg. FT was expressed more in young flower buds than in mature flowers, and was predominantly expressed in young ovary and sheath. Seasonal expression analysis in leaves of a three-year-old spring orchid showed that a large increase in transcription, which started on June 20 for. CgFT. We propose that the increased transcription in the middle of June marks the beginning of flower induction in this species. The ectopic expression of. CgFT in transgenic tobacco plants showed novel phenotypes by flowering earlier than wild-type plants. Further analysis of the flowering time-related genes indicated that the expression of. LEAFY,. APETALLA1,. FRUITFULL and. SEPALLATA1 were significantly upregulated in 35S:. CgFT transgenic tobacco plants. These results indicated that. CgFT is a putative. FT homolog in spring orchid that regulates flower transition, similar to its homolog in. Arabidopsis. This study provides the first information on the spring orchid floral gene to elucidate the regulation of the flowering transition in spring orchid.

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