Expression of SANT/HTH Myb mRNA, a plant morphogenesis-regulating transcription factor, changes due to viroid infection
Language English Country Germany Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
26118459
DOI
10.1016/j.jplph.2015.06.001
PII: S0176-1617(15)00138-8
Knihovny.cz E-resources
- Keywords
- Biolistic plant inoculation, Nicotiana benthamiana, RNA decay, Solanum lycopersicum, Transgenote, mRNA target,
- MeSH
- Host-Pathogen Interactions MeSH
- Plant Leaves growth & development metabolism virology MeSH
- RNA, Small Untranslated genetics metabolism MeSH
- RNA, Messenger genetics metabolism MeSH
- Molecular Sequence Data MeSH
- Plant Diseases genetics virology MeSH
- Plant Growth Regulators genetics metabolism MeSH
- RNA, Viral genetics metabolism MeSH
- Plant Proteins genetics metabolism MeSH
- Sequence Analysis, RNA MeSH
- Solanum lycopersicum genetics metabolism virology MeSH
- Nicotiana genetics metabolism virology MeSH
- Transcription Factors genetics metabolism MeSH
- Viroids genetics pathogenicity physiology MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- RNA, Small Untranslated MeSH
- RNA, Messenger MeSH
- Plant Growth Regulators MeSH
- RNA, Viral MeSH
- Plant Proteins MeSH
- Transcription Factors MeSH
Potato spindle tuber viroid (PSTVd) belongs to plant-pathogenic, circular, non-coding RNAs. Its propagation is accompanied by (mis)regulation of host genes and induction of pathogenesis symptoms including changes of leaf morphogenesis depending on the strength of viroid variant. We found strong genotype-dependent suppression of tomato morphogenesis-regulating transcription factor SANT/HTH-Myb (SlMyb) due to viroid pathogenesis. Its relative mRNA level was found to be significantly decreased in PSTVd-sensitive tomato (cvs Rutgers and Heinz 1706) due to degradation processes, but increased in PSTVd-tolerant (cv. Harzfeuer). In heterologous system of Nicotiana benthamiana, we observed a SlMyb-associated necrotic effect in agroinfiltrated leaf sectors during ectopic overexpression. Leaf sector necroses were accompanied by activation of nucleolytic enzymes but were suppressed by a strongly pathogenic PSTVd variant. Contrary to that, PSTVd's effect was inhibited by the silencing suppressor p19. It was found that in both, Solanum lycopersicum leaves and N. benthamiana leaf sectors, SlMyb mRNA degradation was significantly stronger in viroid-infected tissues. Necroses induction as well as gene silencing experiments using the SANT/HTH-Myb homologues revealed involvement of this Myb in physiological changes like distortions in flower morphogenesis and growth suppression.
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