Abstract
Culture filtrate of Penicillium simplicissimum GP17-2 that is the plant growth promoting fungi induces systemic resistance (ISR) to Arabidopsis thaliana. We performed microarray analysis of the gene expression that responded to culture filtrate of GP17-2. Microarray data of stress response, pest response, phytohormone response, nutrient response and others. of A. thaliana are publicly available. We performed comparative analysis of expression pattern in pathogen response, phytohormone response, hydrogen peroxide response, wound response and culture filtrate of GP17-2 response. The response to GP17-2 showed the closest relationship with abscisic acid response. Plant stomata can play an active role in limiting bacterial invasion as part of the plant innate immune system and signal transduction pathway through abscisic acid involve in stomatal closure. A. thaliana inoculated with bacterial pathogen after soaking the root in culture filtrate of GP17-2 was significantly induced stomatal closure. This result suggest that stomatal closure involved in ISR by culture filtrate of GP17-2.
