Exogenous GA(3) promotes flowering in Paphiopedilum callosum (Orchidaceae) through bolting and lateral flower development regulation

文献类型： 外文期刊

第一作者： Yin, Yuying

作者： Yin, Yuying;Li, Ji;Guo, Beiyi;Li, Lin;Ma, Guohua;Wu, Kunlin;Fang, Lin;Zeng, Songjun;Yin, Yuying;Li, Ji;Guo, Beiyi;Zeng, Songjun;Yang, Fengxi;Zhu, Genfa

作者机构：

期刊名称：HORTICULTURE RESEARCH （ 影响因子：7.291； 五年影响因子：7.487 ）

ISSN： 2662-6810

年卷期： 2022 年 9 卷

页码：

收录情况： SCI

摘要： Paphiopedilum orchids have a high ornamental value, and their flower abundance and timing are both key horticultural traits regulated by phytohormones. All one-flowered Paphiopedilum have additional lateral buds in the apical bract that fail to develop. In this study, an exogenous gibberellin (GA(3)) application promoted flowering of Pathiopedilum callosum by inducing its early bolting instead of the floral transition of dominant flowers. Applying GA(3) effectively promoted lateral flower differentiation, resulting in a two-flowered inflorescence. GA-promoted lateral flower formation involved GA interacting with indole-3-acetic acid (IAA) and cytokinins (CTKs), given the decreased CTK content and downregulated expression of CTK synthesis genes, the increased IAA content and downregulated expression of IAA degradation, and the upregulated expression of transport genes. Further, GA acted via PcDELLA, PcTCP15, and PcXTH9 expressed in stage 5 to promote bolting, and via expression of PcAP3, PcPI, and PcSEP to promote flowering. This study provides insight into mechanisms regulating flower development of P. callosum.

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