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β-1,4-glucanase can not only promote the wound healing of grafted seedlings but can also have a positive effect on a plant's cell wall construction. As a critical gene of β-1,4-glucanase, GH9B is involved in cell wall remodeling and intercellular adhesion and plays a vital role in grafting healing. However, the GH9B family members have not yet been characterized for melons. In this study, 18 CmGH9Bs were identified from the melon genome, and these CmGH9Bs were located on 15 chromosomes. Our phylogenetic analysis of these CmGH9B genes and GH9B genes from other species divided them into three clusters. The gene structure and conserved functional domains of CmGH9Bs in different populations differed significantly. However, CmGH9Bs responded to cis elements such as low temperature, exogenous hormones, drought, and injury induction. The expression profiles of CmGH9Bs were different. During the graft healing process of the melon scion grafted onto the squash rootstock, both exogenous naphthyl acetic acid (NAA) and far-red light treatment significantly induced the upregulated expression of CmGH9B14 related to the graft healing process. The results provided a technical possibility for managing the graft healing of melon grafted onto squash by regulating CmGH9B14 expression.

international journal of molecular sciences

Genome-Wide Characteristics of GH9B Family Members in Melon and Their Expression Profiles under Exogenous Hormone and Far-Red Light Treatment during the Grafting Healing Process