Acibenzolar-S-methyl induces lettuce resistance against Xanthomonas campestris pv. vitians

Abstract

Acibenzolar-S-methyl (Benzo [1,2,3] thiadiazole-7-carbothioic acidS methyl ester, ASM; Bion 50 WG) was found to be more protective for lettuce against bacterial speck disease caused by Xanthomonas campestris pv. vitians. The experiments were conducted under controlled climatic conditions in the greenhouse, and induction of defense mechanism using ASM treatment against challenged inoculation with X. campestris pv. vitians was studied. It was effective in reducing the severity of disease and bacterial growth when compared with control and copper hydroxide. Pathogen growth was also followed with specific PCR before the typical symptom development on leaf tissues. Equal plant tissues collected from infected pnjm, lants were used in order to compare different treatments and pathogen invasion. The induction interval (48) before inoculation period was convenient for the control of pathogen by ASM treatment. The findings show that ASM treatment in inoculated plants has long lasting effect to induce defense-related enzymes, contributing to the enhancement of plant resistance. The effect was comparable with copper treatment. As a marker of resistance, PR protein activity chitinase showed remarkable increase, depending on decreasing bacterial growth in planta.

The influence of exogenous methyl jasmonate on the germination and, content and composition of flavonoids in extracts from seedlings of yellow and narrow-leafed lupine

“…Este último hecho es muy importante puesto que evita la presencia de fitoalexinas que pueden ser riesgosas para la salud humana (estrogenizantes) o que pueden cambiar las propiedades organolépticas de los vegetales. Se ha comprobado in vitro e in vivo que varias sustancias protegen cultivos por un mecanismo de acción que no es del tipo biocida sino que involucra la inducción de fitoalexinas, como es el caso del Acylbenzolar (Fahri, 2011;Buonaurio et al, 2002). Estas sustancias actúan de manera análoga a los elicitores y se categorizan dentro de los llamados protectantes; son importantes porque tienen un potencial ecotoxicológico que es muy bajo o nulo.…”