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Leaf rust (Puccinia triticina) mediated RNAi in wheat (Triticum aestivum L.) prompting host susceptibility.
Functional & Integrative Genomics 2019 January 23
Significance of microRNAs in regulating gene expression in higher eukaryotes as well as in pathogens like fungi to suppress host defense is a well-established phenomenon. The present study focuses on leaf rust fungi Puccinia triticina (Pathotype 77-5) mediated RNAi to make wheat (Triticum aestivum L.) more susceptible. To reach such conclusions, we first confirmed the presence of argonaute (AGO) and dicer-like protein (DCL) family sequences in Puccinia. Bioinformatic tools were applied to retrieve the sequences from Puccinia genome followed by cloning and sequencing from P. triticina pathotype 77-5 cDNA to obtain the specific sequences. Their homologs were searched in other 14 Puccinia races to relate them with pathogenesis. Further, precursor sequences for three miRNA-like RNA molecules (milRs) were cloned from P. triticina cDNA. Their target genes like MAP kinase were successfully predicted and validated through degradome mapping and qRT-PCR. Gradual increase in milR2 (milR and milR*) expression over progressive time point of infection and positive expression for all the milRs within 77-5 urediniospores confirmed a complete host- independent RNAi activity by P. triticina.
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