EXPRESSION PROFILING OF MALATE DEHYDROGENASE SUPEROXIDE DISMUTASE AND POLYGALACTURONASEINHIBITING PROTEIN IN COMMON BEAN IN RESPONSE TO HOST AND NONHOST PATHOGENS
A. Safaie Farahani, S.M. Taghavi
The expression of malate dehydrogenase, superoxide dismutase and polygalacturonase- inhibiting protein was investigated in common bean plants inoculated with Xanthomonas hortorum pv. pelargonii as a non-host pathogen and X. axonopodis pv. phaseoli as a host pathogen. In comparison with inoculated plants with a host pathogen, more expression of malate dehydrogenase and superoxide dismutase was observed in treatments of non-host pathogen. The maximum expression of the genes was recorded 48 h post inoculation. Malate dehydrogenase and superoxide dismutase play crucial roles in incompatible plant-pathogen interaction. No significant difference was detected in expression of polygalacturonase-inhibiting protein in inoculated plants with host or non-host pathogen compared to control in any time points. In the absence of polygalacturonase that acts as an elicitor, polygalacturonase-inhibiting protein are not expressed.