Abstract
Antimicrobial peptides (AMPs) are major components of innate immunity in plants and animals. AMP genes have significant intra- and interspecific polymorphism, the role of which is poorly understood. Previously, by high-throughput transcriptome sequencing of wheat plants, we identified defensin genes up-regulated upon infection with the pathogenic fungus Fusarium oxysporum and/or treatment with resistance inducers. In the present work, a bioinformatic search in NCBI databases for peptide homologs of these defensins was carried out using the sequences of their γ-cores, the sites of the molecules responsible for antimicrobial activity. DEFL1-16 homologs were identified in 95 species of angiosperms belonging to 48 families and 30 orders of monocotyledonous and dicotyledonous plants. The ubiquitous distribution of this defensin in angiosperms suggests its involvement not only in defense but also in other processes in flowering plants. Homologs of other defensins induced by infection were found only in plants of the Poaceae family, which suggests the existence of a Poaceae-specific defense mechanism associated with the expression of these defensins. Among the γ-core variants of wild plant defensins identified in the study, the peptides with better antimicrobial activity compared to wheat may be present, which are of considerable interest for the development of new antibiotics for medicine and agriculture.
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This work was supported by the Russian Science Foundation (grant no. 22-16-00010).
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Slezina, M.P., Istomina, E.A. & Odintsova, T.I. Biological Diversity of Genes Encoding Wheat Defensin Homologs. Russ J Genet 59, 1310–1319 (2023). https://doi.org/10.1134/S1022795423120116
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DOI: https://doi.org/10.1134/S1022795423120116