ArticleBMC plant biology2025
Integrative transcriptomic and metabolomic profiling reveals dynamic differences in pathogen resistance to twig blight in Myrica rubra.
Article in BMC plant biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundTwig blight (TB), caused by Pestalotiopsis-like species, induces twig dieback in Myrica rubra, leading to substantial economic losses in its production across China and posing a significant threat to M. rubra cultivation. To date, the immune response of M. rubra to Pestalotiopsis-like infections remains poorly understood.
resultsIn this study, full-length transcriptomics and untargeted metabolomics were employed to investigate the immune responses of resistant "Dingao" (DA) and susceptible "Dongkui" (DK) M. rubra cultivars to Pestalotiopsis pathogen infection at early (1DPI) and later (5DPI) stage. The main findings revealed that the resistant DA triggered a rapid and robust immune response at 1DPI, with 1,111 differentially expressed genes (DEGs), including 583 upregulated and 528 downregulated. As the immune response progressed to 5DPI, the number of DEGs in Dingao was reduced to 324 DEGs (114 upregulated and 210 downregulated). In contrast, the susceptible Dongkui cultivar exhibited a weak and delayed defense response. At 1DPI only 99 DEGs (26 upregulated and 73 downregulated) were identified in DK leaves; by 5DPI, a substantial shift occurred in Dongkui samples, with 3,414 DEGs (2,141 upregulated and 1,273 downregulated), showing a late but massive defense response. In Dingao samples, WRKY, AP2/ERF transcription factors (TFs) were the most upregulated TFs at the early immune response stage; by 5DPI, NAC and WRKY families became the most prominently expressed TFs. In Dongkui, notable TF upregulation (including WRKY, MYB and AP2/ERF) was only observed at 5DPI and there were not significantly expression changes at the early immune response stage. Further analysis using untargeted metabolomics revealed that Dongkui exhibited 280 upregulated and 12 downregulated differentially accumulated metabolites (DMs) at 1DPI; 503 and 166 DMs were found to be upregulated and regulated at 5DPI. In Dingao plants, 472 DMs were upregulated and 110 downregulated at 1DPI, whereas at 5DPI, 387 DMs were upregulated and 219 downregulated.
conclusionsThrough a combined analysis of full-length transcriptomics and untargeted metabolomics, we revealed distinct molecular and metabolic responses between resistant "Dingao" (DA) and susceptible "Dongkui" (DK) M. rubra cultivars under twig blight stress.
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