title: Down-regulation of photosystem I by Erwinia carotovora-derived elicitors correlates with H(2)O(2) accumulation in chloroplasts of potato.
abstract: SUMMARY Identification of Solanum tuberosum genes responsive to culture filtrates (CF) from Erwinia carotovora ssp. carotovora resulted in isolation of psaD, a nuclear gene encoding the PSI-D subunit of photosystem I (PSI). This gene was rapidly and markedly down-regulated in CF-treated or wounded plants. Down-regulation of psaD transcripts was also triggered by signal molecules involved in plant defence such as methyl jasmonate. The CF-induced down-regulation of psaD transcripts was correlated with an accumulation of hydrogen peroxide in chloroplasts and a down-regulation of the NADP(+) photoreduction activity mediated by PSI. These results suggest that the CF-induced down-regulation of PSI may be related to the accumulation of reactive oxygen species in chloroplasts of plant cells responding to E. c. carotovora.
authors.affiliation: Department of Biosciences, Division of Genetics, University of Helsinki, Box 56, FIN-00014, Helsinki, Finland.
authors.forename: Marcos
authors.initials: M
authors.lastname: Montesano
authors.forename: Henrik V
authors.initials: HV
authors.lastname: Scheller
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Wettstein
authors.forename: E Tapio
authors.initials: ET
authors.lastname: Palva