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Poor agricultural practices have caused eroded soils, therefore alternatives are sought for the solubilization and fixation of nutrients by mycorrhizal fungi, that grow on the plants roots forming a mutualist symbiosis. Therefore, in this work, Basidiomycetes fungi were isolated and those that are able to solubilizing phosphorus and nitrogen were selected for their inoculation in lettuce (Lactuca sativa), this is high consumption and fast growth vegetable. Five substrates (fertile soil, eroded soil, humus and horse manure) were studied with a not inoculated control, where the response variable was hypocotyl growth and the L. sativa radicle, measured every 24 hours for 30 days. It was observed that the HM3 fungi stimulated the highest growth of the plant in eroded soil, generating an alternative to agriculture and contributing to bioremediation and exploitation of damaged soils

The aim of this work was the isolation of endophytic cacti fungi producer of pigments. Twenty different endophytic fungi were isolated from Ferocactus latispinus using a standard method. One of these was an orange pigment producer and was identified with molecular biology techniques amplifying internal transcribe spacer region. The fungus identified was Fusarium solani; it is a producer of polyketides from naphthoquinones family. Experiments with different carbon and nitrogen sources were performed, and it was found that both glycerol and ammonia sulphate promote the naphthoquinones biosynthesis. It was also found that the carbon/nitrogen ratio and pH value had an effect on this biosynthesis phenomenon; increasing productivity being observed at the initial C: N ratio of 59.6, pH 6 and time of 113.3 h. This C: N ratio exhibited a stress condition for fungi in the pigment biosynthesis process in liquid media. The optimum value of total naphthoquinones (476 μmol/L) was obtained using a central rotable composite design.