AP2-domain transcription factor WRI5a-regulated MtABCB1 promotes arbuscule development in mycorrhizal symbiosis (IMAGE)

Science China Press

AP2-domain transcription factor WRI5a-regulated MtABCB1 promotes arbuscule development in mycorrhizal symbiosis

Caption

A proposed model for MtABCB1 function in arbuscule development. During arbuscular mycorrhizal colonization, WRI5a binds to the AW-box motif in the promotor of MtABCB1, activating its expression in colonized cells. MtABCB1 is subsequently targeted to the periarbuscular membrane, exporting symbiotic molecules (e.g., IAA) into the periarbuscular space. These molecules from the host plant may be perceived by the fungi, promoting hyphal branching and facilitating arbuscule development.

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Wanxiao Wang and Xiaowei Zhang

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