Abstract
Plants have developed several genetically regulated defense strategies against a wide range of biotic stresses (viruses, fungi, bacteria, nematodes). There is experimental evidence that DNA methylation and post-transcriptional gene silencing (PTGS) are strongly associated and have evolved as plant defense mechanisms against invasion by foreign nucleic acids, including viruses. Recent studies have shown that PTGS is activated in plants infected by the geminivirus Tomato yellow leaf curl Sardinia virus (TYLCSV). To compare the DNA methylation profiles in TYLCSV-infected vs mock-inoculated tomato (Solanum lycopersicum syn. Lycopersicon esculentum) plants, a methylation-sensitive amplification polymorphism (MSAP) methodology was applied. The pattern of methylation was assayed at different stages of infection (1, 7, and 14 days) after inoculation by the natural vector Bemisia tabaci. Thirty-four polymorphic fragments were identified, of which ten were sequenced. The majority (eight out of ten) of polymorphisms generated by changes in methylation after TYLCSV infection belong to expressed portions of the tomato genome, mostly involved in defense and stress responses. Although the differences in expression levels during infection (in all cases examined except one) could be detected at least at one time-point, no clear correlation could be found between overexpression or underexpression and changes in methylation profiles. Our data demonstrate that TYLCSV induces changes in the methylation status of the tomato genome and that MSAP might contribute in identifying genes involved in plant–virus interactions.
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Abbreviations
- MSAP:
-
methylation-sensitive amplification polymorphism
- AFLP:
-
amplified fragment length polymorphism
- RT-qPCR:
-
reverse transcription quantitative PCR
- PTGS:
-
post-transcriptional gene silencing
- TGS:
-
transcriptional gene silencing
- TYLCSV:
-
Tomato yellow leaf curl Sardinia virus
- TLCV:
-
Tomato leaf curl virus
- TGMV:
-
Tomato golden mosaic virus
- IAP:
-
inoculation access period
- AGT:
-
actin gene tomato
- BLAST:
-
basic local alignment search tool
- CDS:
-
coding sequence
- GSS:
-
Genome Survey Sequences (database)
- PLACE:
-
plant cis-acting regulatory DNA elements (database)
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Acknowledgements
We thank Lorenzo Barchi, Daniele Marian, and Manuela Vecchiati for the technical assistance; Piero Caciagli for the help with whitefly transmission; and Robert G. Milne for the critical reading of the manuscript. This work was supported in part by funds for scientific research of Regione Piemonte.
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Mason, G., Noris, E., Lanteri, S. et al. Potentiality of Methylation-sensitive Amplification Polymorphism (MSAP) in Identifying Genes Involved in Tomato Response to Tomato Yellow Leaf Curl Sardinia Virus. Plant Mol Biol Rep 26, 156–173 (2008). https://doi.org/10.1007/s11105-008-0031-x
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DOI: https://doi.org/10.1007/s11105-008-0031-x