title: Real-time analysis of Polymyxa betae GST expression in infected sugar beet.
abstract: SUMMARY We have tested and developed protocols for both sequence-independent and hybridization probe real-time PCR for the detection of Polymyxa betae glutathione-S-transferase transcripts in infected sugar beet roots. When using the test on P. betae-free plants, no signal above the level of the non-template control was observed. Real-time PCR analysis of both serially diluted zoospore suspensions and infected root material demonstrated a close relationship between the threshold cycle and the amount of P. betae. Hybridization probe real-time analysis of infected plants sampled sequentially over 20 days from sowing showed that the levels of the transcript rose steadily after initial infection to a peak and then declined. Comparative time-course analyses of infection in susceptible plants and a resistant wild Beta species indicated that, whilst transcript levels in susceptible plants showed a continuing upward trend, in the resistant species they were detectable only at an extremely low level.
authors.affiliation: Broom's Barn Research Station, Higham, Bury St Edmunds, Suffolk, IP28 6NP, UK.
authors.forename: Crawford S
authors.initials: CS
authors.lastname: Kingsnorth
authors.forename: Amanda J
authors.initials: AJ
authors.lastname: Kingsnorth
authors.forename: Paul A
authors.initials: PA
authors.lastname: Lyons
authors.forename: Daphne M
authors.initials: DM
authors.lastname: Chwarszczynska
authors.forename: Michael J C
authors.initials: MJ
authors.lastname: Asher