Salicylic Acid, Jasmonic Acid and Ethylene Involved in The Resistance Induced By The Rhizobacterium Pta-Ct2 In Arabidopsis thaliana Against Botrytis cinerea مشارکة حمض الساليسيليک وحمض الياسمونيک والإيثيلين في المقاومة التي تسببها البکتيريا الجذرية PTA-CT2 في نبات (Arabidopsis thaliana) ضد العفن الرمادى (Botrytis cinerea)

Abstract

Salicylic acid (SA), Jasmonic acid (JA) and ethylene (ET) have the significant roles in the plants physiologically and in defense against pathogens. To elucidate the role of these three phytohormones in the development of Induced systemic resistance (ISR), it is a systemic immune response that occurs when the roots are colonized by beneficial microbes. The study model of SRI is the combination of specific beneficial strains of Pseudomonas fluorescens PTA-CT2 with Arabidopsis thaliana, the course of camalexin levels was monitored before and after infection with the fungus Botrytis cinerea. To conduct this, we use different mutants and transgenic plants that fail in the pathway of JA (jar1), ethylene (ein2) or NahG (transgenic line degrading salicylic acid [SA]). We are therefore monitoring the evolution of camalexin, a highly lipophilic phytoalexin, before and after bacterization and/or infection. As a consequence of the study, the bacterization induces potentiation of the defenses, which depends on the three signaling pathways. In addition, the recognition of the beneficial bacteria is reduced by JA and ET.

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“…The prime function of ISR is to activate plant defense mechanisms and protect unexposed parts of plants against pathogenic microbe and herbivorous insect invasions (Sardar et al, 2021). PGPB-mediated ISR depones on jasmonic acid and ethylene signaling pathways in plants (Abid and Karim, 2021). These hormones stimulate the host plant's defense responses to a range of pathogens without the need for PGPB to interact directly with pathogens.…”