Differential accumulation of Phytophthora cambivora cox II gene transcripts in infected chestnut tissue

作者：Vannini Andrea; Tomassini Alessia; Bruni Natalia; Vettraino Anna M^*

来源：FEMS Microbiology Letters, 2014, 353(1): 19-25.

DOI：10.1111/1574-6968.12398

• molecular diagnostics
• mRNA
• differential transcripts accumulation

This study provides a novel qRT-PCR protocol for specific detection and proof of viability of Phytophthora in environmental samples based on differential accumulation of cox II transcripts. Chemical and physical treatments were tested for their ability to induce in vitro the accumulation of cytochrome oxidase genes encoding subunits II (cox II) transcripts in Phytophthora cambivora. Glucose 170mM, KNO3 0.25mM and K3PO3 0.5 and 0.8mM induced the transcription of cox II in P.cambivora living mycelium while no transcription was observed in mycelium previously killed with 0.5% (p/v) RidomilGold((R)) R WG. Living chestnut tissue was artificially infected with P.cambivora and treated with inducers. In vivo experiments confirmed the ability of glucose to induce the accumulation of P.cambivora cox II transcripts. Based on these results, pretreatment of environmental samples with glucose prior to nucleic acid extraction increased the accumulation of specific cox II transcripts, and therefore the sensitivity of qRT-PCR assay for detection of P.cambivora in living tissues. Furthermore, differential accumulation of transcripts between treated and untreated samples represents an unequivocal proof of inoculum viability.

• 出版日期2014-4