Plants extracts as germination and seedling establishment promoters in lettuce and maize/Extratos vegetais como promotores de germinacao e estabelecimento de pl ntulas de alface e milho

Substances produced by plants have huge importance regulating multiple functions as germination, development promoter/enhancer, yield increaser and activator of plant defense system against diseases and pests. Due to diversity, each plant species produces different compounds and in different concentrations. This research evaluated the role of 20 plants extracts obtained from different plant species or plant tissues on seed germination and seedlings establishment of maize and lettuce, in concentration of 5%, 10% or 20%. For this, two experiments were carried out, the first analyzing 20 plant extracts and the effects on germination percentage and root and shoot length based on the germination test for the two species. The second was carried out in a greenhouse, in a completely randomized design with three and ten repetitions for maize and lettuce, respectively, using only the three extracts with the best results from the first experiment. Seedling height and seedling dry matter were evaluated. To germination test most of extracts showed negative or no effects in both species. Only Conyza bonariensis at 5% and Richardia brasiliensis at 5% and 20% had positive effects on early seedling growth, increasing the seedlings length for maize seedlings. To seedlings establishment, Conyza bonariensis, Leucaena leucocephala and Richardia brasiliensis extracts did not show statistical difference to shoots height but increased the dry mass of shoots and roots. The results demonstrated that these plants extract have potential as growth promoters and can be a good option to a better seedling growth and establishment, collaborating to a more effective agriculture. Key words: biostimulants, Lactuca sativa L., Seedlings growth, Zea mays L. Subst ncias produzidas por plantas t m grande import ncia na regulacao de m ltiplas func es, como germinacao, promocao de crescimento, aumento na producao (frutos, sementes, biomassa, etc.) e ativacao de mecanismos de defesa da planta contra ataques de pragas e doencas. Plantas sao amplamente diversas, cada especie produz diferentes compostos em diferentes concentrac es. O objetivo deste trabalho foi avaliar o efeito de 20 extratos de plantas obtidos de diferentes especies vegetais sobre a germinacao e estabelecimento de pl ntulas de milho e alface, nas concentrac es de 5%, 10% ou 20%. Foram realizados dois experimentos, o primeiro afim de avaliar os efeitos dos 20 extratos sobre a germinacao e sobre o comprimento radicular e de parte aerea