A BLADE-ON-PETIOLE orthologue regulates corolla differentiation in the proximal region in Torenia fournieri

Shihao Su (), Yawen Lei, Xuan Zhou, Takamasa Suzuki, Wei Xiao and Tetsuya Higashiyama
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Shihao Su: Sun Yat-sen University
Yawen Lei: Guangdong Academy of Science
Xuan Zhou: Sun Yat-sen University
Takamasa Suzuki: Chubu University
Wei Xiao: University of Tübingen
Tetsuya Higashiyama: The University of Tokyo

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract The three-dimensional shape of a flower is integrated by morphogenesis along different axes. Differentiation along the petal proximodistal axis is tightly linked to the specification of pollinators; however, it is still unclear how a petal patterns this axis. The corolla of Torenia fournieri exhibits strong differentiation along the proximodistal axis, and we previously found a proximal regulator, TfALOG3, controlling corolla neck differentiation. Here, we report another gene, TfBOP2, which is predominantly expressed in the proximal region of the corolla. TfBOP2 mutants have shorter proximal corolla tubes and longer distal lobe, demonstrating its function as a proximal regulator. Arabidopsis BOPs mutant shows similar defects, favouring a shared role of BOPs homologues. Genetic analysis demonstrates the interaction between TfBOP2 and TfALOG3, and we further found that TfALOG3 physically interacts with TfBOP2 and can recruit TfBOP2 to the nuclear region. Our study favours a hypothetical shared BOP-ALOG complex that is recruited to regulate corolla differentiation in the proximal region axis of T. fournieri.

Date: 2023
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DOI: 10.1038/s41467-023-40399-3

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