An atypical class of non-coding small RNAs is produced in rice leaves upon bacterial infection - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Article Dans Une Revue Scientific Reports Année : 2021

An atypical class of non-coding small RNAs is produced in rice leaves upon bacterial infection

Lisa Claude
Ralf Koebnik
Boris Szurek

Résumé

Non-coding small RNAs (sRNA) act as mediators of gene silencing and regulate plant growth, development and stress responses. Early insights into plant sRNAs established a role in antiviral defense and they are now extensively studied across plant–microbe interactions. Here, sRNA sequencing discovered a class of sRNA in rice ( Oryza sativa ) specifically associated with foliar diseases caused by Xanthomonas oryzae bacteria. Xanthomonas -induced small RNAs (xisRNAs) loci were distinctively upregulated in response to diverse virulent strains at an early stage of infection producing a single duplex of 20–22 nt sRNAs. xisRNAs production was dependent on the Type III secretion system , a major bacterial virulence factor for host colonization. xisRNA loci overlap with annotated transcripts sequences, with about half of them encoding protein kinase domain proteins. A number of the corresponding rice cis- genes have documented functions in immune signaling and xisRNA loci predominantly coincide with the coding sequence of a conserved kinase motif. xisRNAs exhibit features of small interfering RNAs and their biosynthesis depend on canonical components OsDCL1 and OsHEN1. xisRNA induction possibly mediates post-transcriptional gene silencing but they do not broadly suppress cis -genes expression on the basis of mRNA-seq data. Overall, our results identify a group of unusual sRNAs with a potential role in plant–microbe interactions.
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hal-03514038 , version 1 (06-01-2022)

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Ganna Reshetnyak, Jonathan M Jacobs, Florence Auguy, Coline Sciallano, Lisa Claude, et al.. An atypical class of non-coding small RNAs is produced in rice leaves upon bacterial infection. Scientific Reports, 2021, 11 (1), ⟨10.1038/s41598-021-03391-9⟩. ⟨hal-03514038⟩
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