Delphinieae flowers originated from the rewiring of interactions between duplicated and diversified floral organ identity and symmetry genes

文献类型： 外文期刊

第一作者： Zhao, Huiqi

作者： Zhao, Huiqi;Liao, Hong;Li, Shuixian;Zhang, Rui;Dai, Jing;Ma, Pengrui;Wang, Tianpeng;Wang, Meimei;Yuan, Yi;Fu, Xuehao;Cheng, Jie;Duan, Xiaoshan;Kong, Hongzhi;Shan, Hongyan;Zhao, Huiqi;Li, Shuixian;Wang, Meimei;Yuan, Yi;Kong, Hongzhi;Li, Shuixian;Wang, Meimei;Yuan, Yi;Fu, Xuehao;Cheng, Jie;Kong, Hongzhi;Shan, Hongyan;Zhao, Huiqi;Zhang, Rui;Xie, Yanru;Zhang, Peng

作者机构：

期刊名称：PLANT CELL （ 影响因子：11.6； 五年影响因子：12.9 ）

ISSN： 1040-4651

年卷期： 2023 年 35 卷 3 期

页码：

收录情况： SCI

摘要： Species of the tribe Delphinieae (Ranunculaceae) have long been the focus of morphological, ecological, and evolutionary studies due to their highly specialized, nearly zygomorphic (bilaterally symmetrical) spiral flowers with nested petal and sepal spurs and reduced petals. The mechanisms underlying the development and evolution of Delphinieae flowers, however, remain unclear. Here, by conducting extensive phylogenetic, comparative transcriptomic, expression, and functional studies, we clarified the evolutionary histories, expression patterns, and functions of floral organ identity and symmetry genes in Delphinieae. We found that duplication and/or diversification of APETALA3-3 (AP3-3), AGAMOUS-LIKE6 (AGL6), CYCLOIDEA (CYC), and DIVARICATA (DIV) lineage genes was tightly associated with the origination of Delphinieae flowers. Specifically, an AGL6-lineage member (such as the Delphinium ajacis AGL6-1a) represses sepal spur formation and petal development in the lateral and ventral parts of the flower while determining petal identity redundantly with AGL6-1b. By contrast, two CYC2-like genes, CYC2b and CYC2a, define the dorsal and lateral-ventral identities of the flower, respectively, and form complex regulatory links with AP3-3, AGL6-1a, and DIV1. Therefore, duplication and diversification of floral symmetry genes, as well as co-option of the duplicated copies into the preexisting floral regulatory network, have been key for the origin of Delphinieae flowers. The making of highly complex Delphinieae flowers involved the duplication and diversification of floral organ identity genes and floral symmetry genes, as well as the rewiring of their interactions.

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