Influência de metabólitos secundários de Trichoderma spp. no desenvolvimento de fungos veiculados pelas sementes e na germinação de sementes de arroz irrigado

Abstract

The cultivation of rice plant requires some care, as the use of fungicide seed treatment, but the subject still raises many questions, regarding the strategies for economic justification of its use. Rice seeds are degraded by a wide variety of pathogens that interfere with vigor and germination. Trichoderma spp. has been used to treat seeds of various crops for medical purposes and development of plants. The objective of research was to assess the interference of secondary metabolites of Trichoderma spp. the development of fungi transmitted by seeds and germination of rice. For this we used two strains (TI1 and TM1) of Trichoderma spp. and conducted tests and experiments, isolation of fungi from the seeds of rice; interference from non-volatile metabolites of Trichoderma spp. the development of fungi transmitted by rice seed; testing aseptic immersion times using different seeds in sodium hypochlorite and germination of rice and interference from non-volatile metabolites of Trichoderma spp. germination of rice seed. As results were found fungi Fusarium spp., Penicillium spp. and Bipolaris oryzae in rice seed and there was no interference of volatile metabolites from two isolates of Trichoderma spp. the mycelial growth of Fusarium and Bipolaris oryzae. The test showed that the aseptic ideal time of immersion in sodium hypochlorite was 15 min and the secondary metabolites of Trichoderma spp. did not interfere in seed germination. Therefore, secondary metabolites released by Trichoderma spp. tested affect the development of fungi transmitted by rice seeds (Fusarium and Bipolaris oryzae) and do not affect the germination of rice seeds.