Exogenous GA(3) promotes flowering in Paphiopedilum callosum (Orchidaceae) through bolting and lateral flower development regulation
文献类型： 外文期刊
作者： Yin, Yuying 1 ; Li, Ji 1 ; Guo, Beiyi 1 ; Li, Lin 1 ; Ma, Guohua 1 ; Wu, Kunlin 1 ; Yang, Fengxi 4 ; Zhu, Genfa 4 ; Fang, Lin 1 ; Zeng, Songjun 1 ;
作者机构： 1.Chinese Acad Sci, Guangdong Prov Key Lab Appl Bot, South China Bot Garden, Guangzhou 510650, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab South China Agr Plant Mol Anal & Gene Imp, South China Bot Garden, Guangzhou 510650, Peoples R China
4.Guangdong Acad Agr Sci, Environm Hort Res Inst, Guangdong Key Lab Ornamental Plant Germplasm Inno, Guangzhou 510640, Peoples R China
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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