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delphinii infects the host and secretes numerous cell wall-degrading enzymes (CWDEs), leading to the degradation of the host cell wall ( Li et al., 2017), followed by hyphal penetration of plant tissues, causing local necrosis and the formation of massive white mycelium and rapeseed-like sclerotia ( Uji et al., 2017). In warm and high humidity environments, S. Southern blight disease is a broad-spectrum disease caused by the necrotrophic pathogen Sclerotium delphinii (P1) and Sclerotium rolfsii ( Iquebal et al., 2017 Uji et al., 2017), and the former is more pathogenic ( Uji et al., 2017). Although the renewal of cultivation patterns has brought about species conservation and the rise of industry, resulting in great ecological and economic benefits ( Si et al., 2017), it is susceptible to diseases in its large-scale cultivation, particularly southern blight disease, which causes substantial economic loss ( Chen et al., 2019a). catenatum has undergone a cross from natural wild to facility cultivation followed by near-wild cultivation ( Chen et al., 2020b). officinale), a perennial herb of the genus Dendrobium in the Orchidaceae family, is a valuable traditional Chinese medicinal herb used for relieving upset stomach, promoting body fluid production, enhancing immunity, nourishing “yin,” and exerting antioxidant and anti-tumor effects ( Chen et al., 2020b). Our findings shed more insights into the critical role of the DcbHLH family in plants and the resistance breeding of D. DcMYC2b-overexpression Arabidopsis lines showed significantly smaller lesions after being infected with P1 than the wild type, indicating that DcMYC2b functions as an important positive regulator in D. Furthermore, exogenous MeJA treatment significantly delayed disease time and reduced lesion size after infection with P1. Subcellular localization indicated that they were located in the nucleus.
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Transcriptome analysis of MeJA and P1 treatment manifested that exogenous MeJA can change the expression pattern of most bHLH genes, especially the IIIe subgroup, including inhibiting the expression of DcbHLH026 ( MYC2a) and promoting the expression of DcbHLH027 ( MYC2b). Promoter cis-acting elements revealed that DcbHLHs contain a large number of stress-related cis-acting elements. Phylogenetic analysis showed that 108 DcbHLH genes could be divided into 23 subgroups. The basic helix–loop–helix ( bHLH) gene family is closely related to plant resistance to external stresses, but the related research in D. catenatum has become the key to solve this problem. Sclerotium delphinii (P1) is a broad-spectrum fungal disease, which causes widespread loss in the near-wild cultivation of D. State Key Laboratory of Subtropical Silviculture, National Forestry and Grassland Innovation Alliance on Dendrobium catenatum, SFGA Engineering Research Center for Dendrobium catenatum, Zhejiang A&F University, Hangzhou, Chinaĭendrobium catenatum, belonging to the Orchidaceae, is a precious Chinese herbal medicine.Cong Li †, Xiang Cai †, Qiuyi Shen, Xueliang Chen, Mengxi Xu, Tianqi Ye, Dun Si, Lingshang Wu, Donghong Chen, Zhigang Han * and Jinping Si *