Custo adaptativo da indução de resistência em feijoeiro mediada pela rizobactéria Bacillus cereus ou acibenzolar-S-metil: atividade de enzimas, síntese de fenóis e lignina e biomassa

Abstract

Plants that use resources to defend themselves in the absence of pests or pathogens will pay off with energy costs that can reflect in the productivity. Thus, the objective of this work was to evaluate the fitness costs of the resistance induced in bean plants, before the presence of the pathogen, by using biotic (Bacillus cereus) and abiotic (acibenzolar-S-methyl, ASM) inducers, applied 2, 3 or 4 times during the cycle of the culture. The protecting effect was evaluated against the bacterium Xanthomonas axonopodis pv. Keywords: Chitinase β-1,3-glucanase; peroxidase; Phaseolus vulgaris; metabolism; yield. Palavras-chave adicionais:Quitinase; β-1,3-glucanase; peroxidase; Phaseolus vulgaris; metabolismo; produtividade. RESUMOPlantas que utilizam recursos para defesa na ausência de pragas ou patógenos, arcarão com custos energéticos que podem refletir na sua produtividade. Assim, teve-se por objetivo avaliar os custos adaptativos da indução de resistência, antes da chegada do patógeno, em feijoeiro induzido por um indutor biótico (Bacillus cereus) e um abiótico (acibenzolar-S-metil, ASM), em 2, 3 ou 4 aplicações distribuídas ao longo do ciclo da cultura. Avaliou-se o efeito protetor contra a bactéria Xan thomonas axono podi s pv. ph ase oli , além d a at ivid ade de peroxidase, quitinase, β-1,3-glucanase, síntese de lignina, fenóis e crescimento com base na matéria seca. Observou-se que os indutores Kuhn, O.J. & Pascholati, S.F.. Custo adaptativo da indução de resistência em feijoeiro mediada pela rizobactéria Bacillus cereus ou acibenzolar-S-metil: atividade de enzimas, síntese de fenóis e lignina e biomassa. Summa Phytopathologica, v.36, n.2, p.107-114, 2010. synthesis and plant growth were evaluated too. It was observed that the inducers protected the bean plants against X. axonopodis pv. phaseoli. The ASM increased the activity of peroxidase, chitinase and β-1,3-glucanase, while B. cereus only increased peroxidase activity. Unlike B. cereus, the ASM increased lignin synthesis and decreased ph enolic c ompound cont ent and pla nt growt h . Th erefore, t he resistance induced by ASM represents high fitness costs for bean plants, while the resistance induced by B. cereus represents low cost and its potential use can be explored.

Extratos Vegetais, Formulações a Base De Extrato Vegetal E Produtos Químicos No Controle Da Mancha Bacteriana Do Maracujazeiro

“…A eficiência do ASM constatada neste trabalho tem sido comprovada no controle de diversas bacterioses como a murcha e a mancha bacteriana do tomateiro, mancha angular do algodoeiro, crestamento bacteriano comum do feijoeiro e mancha bacteriana do maracujazeiro (Araújo et al, 2005;Cavalcanti et al, 2006;Ishida et al, 2008;Zacaroni, 2008;Medeiros et al, 2009;Kuhn & Pascholati, 2010;Boro et al, 2011;Junqueira et al, 2011).…”

“…O acibenzolar-S-metil (ASM) é o ativador de resistência mais estudado e tem sido efetivo no controle de bacterioses, tais como a murcha bacteriana e a mancha bacteriana do tomateiro (Araújo et al, 2005;Cavalcanti et al, 2006), mancha angular do algodoeiro (Ishida et al, 2008;Zacaroni, 2008), crestamento bacteriano comum do feijoeiro (Kuhn & Pascholati, 2010) e mancha bacteriana do maracujazeiro (Junqueira et al, 2011;Boro et al, 2011).…”

Evaluation ofTrichoderma harzianummutant lines in the resistance induction against white mold and growth promotion of common bean

“…This phenomenon, called systemic resistance induction (SRI) or acquired systemic resistance (ASR) implicates in the activation of plant defense mechanisms, in response to exposure to biotic or abiotic agents. These resistance mechanisms may include the accumulation of phytoalexins and proteins related to the pathogenesis process, such as β1.3 glucanases, chitinases and peroxidase (KUHN & PASCHOLATI et al, 2010).…”

Salicylic acid in the induction of resistance to beet seedling damping-off and antifungal activity against Fusarium sp., in vitro

“…This disease causes depressed lesions in young plant tissues that cause the damping off of the seedling, but it may also occur before the emergence of the plant, showing a reduction at the booth of seeding, in this case presented damping-off in preemergence. Alternative methods for disease control stand through the use of inductors or elicitors that induce plant resistance to pathogens (MAZARO et al, 2009;KUHN;PASCHOLATI, 2010).…”