The mechanism of exogenous MeJA-induced CmMYB36-CmVND1 module regulation in the graft union healing process of melon grafted onto squash.

Yulei Zhu,Ziqing Sun,Hongxi Wu,Jiahui Wang,Heng Wang,Chuanqiang Xu,Tianlai Li

Published 2025 in Plant physiology and biochemistry : PPB

ABSTRACT

Exogenous methyl jasmonate (MeJA) plays a significant role in plant growth, development, and defense responses and is crucial for tissue reconnection in grafted plants. However, the mechanism of MeJA participation in the graft union healing of melon grafted onto squash remained unclear. Therefore, elucidating the regulatory mechanism of exogenous MeJA is crucial for enhancing graft union healing efficiency and improving the quality of grafted plants. Our results indicated that exogenous MeJA application to melon scions alone, as well as simultaneous application to both melon scions and squash rootstocks, accelerates the graft union healing process between melon and squash. CmVND1 can respond to MeJA through the CGTCA motif element, and exogenous MeJA induction can further increase the expression of CmVND1. Our transient silencing assays further indicated that CmVND1 can regulate the graft union healing process and improve the healing efficiency. Finally, through yeast one-hybrid and GUS staining assays, we found that CmMYB36 binds to the promoter of its downstream gene CmVND1 and regulates its transcriptional expression levels, thereby accelerating the graft union healing process. In summary, our findings indicated that CmMYB36 participated in the graft union healing process of melon grafted onto squash by upregulating the target gene CmVND1, thereby improving the success rate of grafting and offering practical targets to improve grafting efficiency in melon cultivation.

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