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Fungi interference on seed quality of Solanum granulosoleprosum and Senna alata The increased demand for Brazilian species has been expressive in the last years, due to the interest in recovery of degraded areas and recomposition of the landscape. However, to optimize the use of the basic input for seedling production, there are still gaps to be filled concerning seed quality of some species, such as Solanum granulosoleprosum and Senna alata. This research was divided into four chapters. The first one had the purpose of investigating temperature conditions allied to the incubation period that were more suitable for detection of fungi associated to the seeds of both species studied. The second focused on evaluating the influence of light, temperature, seed position on paper substrates and potassium nitrate on the germination of S. granulosoleprosum seeds, in order to recommend a method for testing germination of this species. On the third chapter the interference of the fungi Alternaria alternata (Aa), Fusarium belonging to the complex of species Fusarium incarnatum-equiseti (FIESC) and Fusarium pseudocircinatum (FPC), on the quality of S. alata seeds was checked, as well as their transmission and survival on the seeds when inoculated by means of water restcriction technique. On the fourth one the interference of (FIESC) on the quality of S. granulosoleprosum seeds, was tested, as well as its transmission and survival, when inoculated in seeds, through the water restriction technique. The results showed that the blotter test method, incubated at 25°C, 7 or 10 days and 25°C, 10 dias, were more favorable for the detection of fungi associated with S. granulosoleprosum and S. alata seeds, respectively. Two genera of potentially pathogenic fungi were identified: Alternaria sp in S. alata and Fusarium sp, for both species studied. The temperature alternation between 20-30 ° C, with sowing between paper and on top of paper, as well as the alternation at 15-35 ° C with sowing on top of paper, under photoperiod of 8 hours and the use of 0.2 % KNO3 solution for substrate wetting are suitable conditions for testing the germination of S. granulosoleprosum seeds. The water restriction technique provided inoculated seeds of S. granulosoleprosum and S. alata. The fungi A. alternata, Fusarium of the incarnatum-equiseti species complex (FIESC) and Fusarium pseudocircinatum (FPC) interfere on the germination and emergence of the seedlings, remain in association with Senna alata seeds during storage period and were transmitted by seeds causing seed death, root necrosis, hypocothil constriction followed by damping off. On the other hand, Fusarium of the incarnatum-equiseti species complex (FIESC) does not interfere on germination of the inoculated S. granulosoleprosum seeds, has the incidence decreased during storage, however, is transmitted from seeds to seedlings causing seed death, seedlings with cotyledons trapped by the seed coat, hypocotyl strangulation, root malformation, hypocotyl with watersoaking and necrosis on cotyledons.

Interferência de fungos na qualidade das sementes de >i<Solanum granulosoleprosum>/i< e >i<Senna alata>/i<