Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 60, Issue 2, Pages 591-602Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ern306
Keywords
Abiotic stress; post-transcriptional gene silencing (PTGS); suppressor of gene silencing (SGS); Verticillium dahliae; V; albo-atrum; V; longisporum
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Funding
- Dutch Graduate School of Experimental Plant Sciences ( EPS)
- Centre for BioSystems Genomics ( CBSG)
- Netherlands Organization for Scientific Research ( NWO)
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RNA silencing is a conserved mechanism in eukaryotes that plays an important role in various biological processes including regulation of gene expression. RNA silencing also plays a role in genome stability and protects plants against invading nucleic acids such as transgenes and viruses. Recently, RNA silencing has been found to play a role in defence against bacterial plant pathogens in Arabidopsis through modulating host defence responses. In this study, it is shown that gene silencing plays a role in plant defence against multicellular microbial pathogens; vascular fungi belonging to the Verticillium genus. Several components of RNA silencing pathways were tested, of which many were found to affect Verticillium defence. Remarkably, no altered defence towards other fungal pathogens that include Alternaria brassicicola, Botrytis cinerea, and Plectosphaerella cucumerina, but also the vascular pathogen Fusarium oxysporum, was recorded. Since the observed differences in Verticillium susceptibility cannot be explained by notable differences in root architecture, it is speculated that the gene silencing mechanisms affect regulation of Verticillium-specific defence responses.
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