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Background   Gastrodia elata  Bl.  f. glauca  S. Chow is a medicinal plant.  G. elata f. glauca  is unavoidably infected by pathogens in their growth process. In previous work, we have successfully isolated and identified  Penicillium oxalicum  from fungal diseased tubers of  G. elata f. glauca . As a widespread epidemic, this fungal disease seriously affected the yield and quality of  G. elata f. glauca . We speculate that the healthy  G. elata F. glauca  might carry resistance genes, which can resist against fungal disease. In this study, healthy and fungal diseased mature tubers of  G. elata f. glauca  from Changbai Mountain area were used as experimental materials to help us find potential resistance genes against the fungal disease.    Results  A total of 7540 differentially expressed Unigenes (DEGs) were identified (FDR < 0.01, log2FC > 2). The current study screened 10 potential resistance genes. They were attached to transcription factors (TFs) in plant hormone signal transduction pathway and plant pathogen interaction pathway, including WRKY22, GH3, TIFY/JAZ, ERF1, WRKY33, TGA. In addition, four of these genes were closely related to jasmonic acid signaling pathway.    Conclusions  The immune response mechanism of fungal disease in  G. elata f. glauca  is a complex biological process, involving plant hormones such as ethylene, jasmonic acid, salicylic acid and disease-resistant transcription factors such as WRKY, TGA.

bmc plant biology

Transcriptome analysis reveals underlying immune response mechanism of fungal (Penicillium oxalicum) disease in Gastrodia elata Bl. f. glauca S. chow (Orchidaceae)