2025Journal article
Li D, Guo D, Liu F, Ren Y, Wang D, Zhou JJ, Song B, Chen Z
International journal of biological macromolecules
Tea leaf spot, caused by the fungus Didymella segeticola, occurs in the high-mountain tea plantations of Southwest China. Due to a limited understanding of the disease's epidemiology and the lack of comprehensive control measures, it has a significant negative impact on tea yield and quality. In this study, we revealed that D. segeticola infection begins when conidia germinate to form a germ tube on the leaf surface. The fungus then grows in the intercellular spaces of the leaf epidermal cells, invading tea tissue and causing necrotic lesions. This infection leads to significant alterations in the cell walls of spongy and palisade mesophyll cells, severely damaging chloroplasts. We employed transcriptomic and metabolomic analyses based on an in vitro infection model using matcha powder to uncover two key genes of D. segeticola: DsHAD (encoding holoacid dehydrogenase) and DsADH (encoding alcohol dehydrogenase). These genes are associated with conidiation, virulence, and sensitivity to oxidative stress. DsHAD regulates the virulence of D. segeticola by modulating glutamate homeostasis. Our results elucidate the infection strategy of D. segeticola on tea leaves and provide valuable data for future research on control measures for tea leaf spot.
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Study type
Observational (human)
Surveys, cohorts and consumer studies, with no intervention.
Assigned automatically from the title, abstract and subject terms.
Topics
Matcha is mentioned in passing here (named in the abstract).
Li D, Guo D, Liu F, Ren Y, Wang D, Zhou JJ, … Chen Z. (2025). Association of haloacid dehydrogenase and alcohol dehydrogenase with vegetative growth, virulence and stress tolerance during tea plant infection by Didymella segeticola. International journal of biological macromolecules. https://doi.org/10.1016/j.ijbiomac.2024.138388
DOI: 10.1016/j.ijbiomac.2024.138388 · PubMed ID: 39643170 · Cited by 10 (OpenAlex)
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