AHMAD, Jam Nazeer; GARCION, Christophe; TEYSSIER, Emeline; HERNOULD, Michel; GALLUSCI, Philippe; PRACROS, Pascale; RENAUDIN, Joël; EVEILLARD, Sandrine

doi:10.1111/j.1365-3059.2012.02605.x

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AHMAD, Jam Nazeer
Biologie du fruit et pathologie [BFP]

GARCION, Christophe
Biologie du fruit et pathologie [BFP]

TEYSSIER, Emeline
Biologie du fruit et pathologie [BFP]

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Plant Pathology. 2013, vol. 62, n° 1, p. 205-216

Wiley

Résumé en anglais

DNA methylation was investigated as a possible mechanism for regulation of floral gene expression in stolbur phytoplasma-infected tomato buds. Expression of methylase and demethylase genes was found to be globally down-regulated in tomato plants infected with stolbur isolate PO, but not in those infected with isolate C. These results are consistent with the finding that SlDEF, a gene orthologous to arabidopsis APETALA3 which is involved in petal formation, was down-regulated in stolbur PO-infected buds and remained unaffected in stolbur C-infected buds, and with the fact that the two stolbur phytoplasma isolates C and PO induce distinct symptoms. Because of variations between the different cell-types of the flower buds, the DNA methylation status of SlDEF could not be clearly established. However, the finding that treatment of stolbur PO-infected plants with 5-azacytidine partially restored SlDEF gene expression strongly suggests that DNA methylation is involved in down-regulation of floral development genes in stolbur PO-infected tomatoes.< Réduire

Mots clés en anglais

5-azacytidine

demethylases

DNA methylation

flower development genes

methylases

stolbur phytoplasma

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Effects of stolbur phytoplasma infection on DNA methylation processes in tomato plants

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