The Interplay Between Salicylic and Jasmonic Acid During Phytopathogenesis - Salicylic Acid: Plant Growth and Development - page 282

Fig. 3 Effects of infection with P. infestans and treatments with SA, JA, and their mixture on
isoenzyme composition of isoperoxidases in tube-grown potato plants in 48 h after inoculation.
(1) Nontreated control; (2) infection; (3) treatment with SA; (4) treatment with SA ? infection;
(5) treatment with JA; (6) treatment with JA ? infection; (7) treatment with SA ? JA; (8)
treatment with SA ? JA ? infection; g - isoperoxidases interacting with P. infestans mycelium;
ch - isoperoxidases interacting with chitin. M - marker proteins; pI - isoelectric poit
In some cases, the anionic POs adsorbed on chitin have similar antigenic
determinants, but the plants belonging to different families—and even members of
the same family—could have polysaccharide-specific POs with different struc-
tures. Thus, the majority of investigated species had anionic chitin-specific per-
oxidases, and these isoforms from potato (Solanaceae) and horseradish
(Brassicaceae) formed lines of precipitation with antibodies to wheat chitin-bound
PO but not to anionic isoPO (Maksimov et al. 2010 ).
Previously Roberts et al. ( 1988 ) defined the fragment of gene encoding one of
potato anionic peroxidases M21334. We found that transcription of this gene in
potato infected by P. infestans increased significantly in early stages of the defence
reaction but decreased rapidly to the control level. In plants treated with SA and
infected, transcription of M21334 was higher by 20-30 % and under the influence
of JA-by 60-80 %.
Treatment of plants by SA wasn't promote the accumulation of gene under
study, however infecting of SA-treated plants by late blight pathogen led to a
multifold increase of a number of transcripts. Possibly it isn't capable to induce an
expression of M21334 gene in potato plants but can sensitize genome to the
perception of elicitor signal.