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Ectopic expression of the Aechmea fasciata APETALA2 gene AfAP2-2 reduces seed size and delays flowering in Arabidopsis

文献类型： 外文期刊

作者： Lei, Ming 1 ; Li, Zhi-ying 1 ; Wang, Jia-bin 1 ; Fu, Yun-liu 1 ; Xu, Li 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Trop Crop Genet Resources, Danzhou 571737, Peoples R China

2.Guangxi Bot Garden Med Plants, Guangxi Key Lab Med Resources Protect & Genet Imp, Nanning 530023, Guangxi, Peoples R China

3.Key Lab Crop Gene Resources & Germplasm Enhanceme, Danzhou 571737, Peoples R China

4.Key Lab Trop Crops Germplasm Resources Genet Impr, Danzhou 571737, Peoples R China

5.Mid Trop Crop Gene Bank Natl Crop Resources, Danzhou 571737, Peoples R China

关键词： Aechmea fasciata; APETALA2; Transcriptional activator; Flowering; Seed size; Bromeliad

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

ISSN： 0981-9428

年卷期： 2019 年 139 卷

页码：

收录情况： SCI

摘要： The Bromeliaceae family, which is distributed pantropically, is one of the most morphologically diverse families. Except for the edible pineapple (Ananas comosus), the vast majority of bromeliads cultivated worldwide are appreciated mainly for their ornamental value. As subtropical and tropical flowering plants, these bromeliads, among with Aechmea fasciata, have significant economic importance. However, the molecular mechanism of flowering in bromeliads remains unrevealed. In this study, an APETALA2 (AP2) homologue, AfAP2.2, which belongs to the AP2/ethylene response element binding protein (AP2/EREBP) transcription factor superfamily, was identified in A. fasciata. AfAP2.2 contains two conserved AP2 domains and is a nuclear-localized transactivator. The expression level of AfAP2-2 was predominantly higher in vegetative organs of the reproductive phase than in those of the vegetative phase. Ectopic expression of AfAP2-2 in Arabidopsis specifically delayed flowering in short-day (SD) conditions. Furthermore, the size and weight of seeds of AfAP2-2-overexpressing Arabidopsis plants were significantly reduced compared to those of the wild type (WT). Our findings suggest that AfAP2-2 might be a negative regulator of flowering and seed size and weight. These results may help facilitate the molecular breeding of bromeliads.

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