Formulações de Bacillus methylotrophicus na promoção de crescimento e indução de resistência em tomateiro contra murcha de fusarium

Abstract

The objective of this study was to evaluate the efficacy of seed treatment with fresh suspensions and powder formulations containing Bacillus methylotrophicus to promote plant growth and induce resistance to fusarium wilt (fusarium oxysporum f. sp. lycopersici) in tomato plants in a greenhouse, verifying the occurrence of morphological and biochemical changes in the evaluated plants. Powder formulations based on cassava (Manihot esculenta), arrowroot (Maranta arundinacea) and sodium alginate containing Bacillus, in addition to the commercial product Quartz, were used to microbiolize tomato seeds of the Santa Cruz cultivar. The formulations promoted plant growth, with a seedling vigor index greater than 50% for all treatments containing B. methylotrophicus, in addition to a significant increase in total dry matter. The treatments induced systemic resistance, controlling fusarium wilt with a 75% reduction in the disease and activation of enzymes such as peroxidase and polyphenol oxidase, only B-1,3-glucanase showed lower activity than the controls (treatments without B. methylotrophicus). Thus, the use of formulations containing Bacillus is efficient in promoting the growth of weed plants and inducing resistance to control fusarium wilt