首页|cla-miR164-NO APICAL MERISTEM(ClNAM)regulates the inflorescence architecture development of Chrysanthemum lavandulifolium

cla-miR164-NO APICAL MERISTEM(ClNAM)regulates the inflorescence architecture development of Chrysanthemum lavandulifolium

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Chrysanthemum x morifolium has great ornamental and economic value on account of its exquisite capitulum.However,previous studies have mainly focused on the corolla morphology of the capitulum.Such an approach cannot explain the variable inflorescence architecture of the chrysanthemum.Previous research from our group has shown that NO APICAL MERISTEM(ClNAM)is likely to function as a hub gene in capitulum architecture in the early development stage.In the present study,ClNAM was used to investigate the function of these boundary genes in the capitulum architecture of Chrysanthemum lavandulifolium,a closely related species of C.x morifolium in the genus.Modification of ClNAM in C.lavandulifolium resulted in an advanced initiation of the floral primordium at the capitulum.As a result,the receptacle morphology was altered and the number of florets decreased.The ray floret corolla was shortened,but the disc floret was elongated.The number of capitula increased significantly,arranged in more densely compounded corymbose synflorescences.The yeast and luciferase reporter system revealed that ClAP1,ClRCD2,and ClLBD18 target and activate ClNAM.Subsequently,ClNAM targets and activates ClCUC2a/c,which regulates the initiation of floral and inflorescence in C.lavandulifolium.ClNAM was also targeted and cleaved by cla-miR164 in this process.In conclusion,this study established a boundary gene regulatory network with cla-miR164-ClNAM as the hub.This network not only influences the architecture of capitulum,but also affects compound corymbose synflorescences of the C.lavandulifolium.These results provide new insights into the mechanisms regulating inflorescence architecture in chrysanthemum.

Junzhuo Li、Xiaohui Wen、Qiuling Zhang、Yuankai Tian、Ya Pu、Jiaying Wang、Bo Liu、Yihan Du、Silan Dai

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Beijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding,National Engineering Research Center for Floriculture,Beijing Laboratory of Urban and Rural Ecological Environment,Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants of Ministry of Education,Beijing Forestry University,School of Landscape Architecture,Beijing Forestry University,35 East Qinghua Road,Beijing,100083,China

Flower Research and Development Center,Zhejiang Academy of Agricultural Scien

国家自然科学基金国家自然科学基金国家自然科学基金

323719483153006431471907

2024

10.1093/hr/uhae039

园艺研究(英文)

园艺研究(英文)

CSTPCD
ISSN：
年,卷(期)：2024.11(4)
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