Armazenamento, aplicação de antioxidantes e otimização do tempo em casa de vegetação no enraizamento de miniestacas de híbridos de Eucalyptus grandis

• Autor(a) principal: Melo, Lucas Amaral de
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2996
• topic: Miniestaquia; Propagação vegetativa; Clonagem; Minicuttings; Vegetative propagation; Clones; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::SILVICULTURA

The present study aimed to determine the time for the rooting of minicuttings in a climatized greenhouse; to assess the influence of the time interval between collection/preparation and plantation, and; to evaluate the use of antioxidants in minicutting rooting of Eucalyptus clones. Minicuttings of five Eucalyptus spp. clones (C1, C2, C3 and C4 = Eucalyptus urophylla x E. grandis and C5 = natural hybrid Eucalyptus grandis), collected in ministumps located at a clonal minigarden, were used. The ministumps were obtained by minicutting rooting in channels of masonry filled with washed sand. By the monitoring of the rooting process of five clones (C1, C2, C3, C4 and C5), peculiarities related to the behavior of each genetic material during the rooting process were verified. It was possible to observe that the necessary time for this process differs among the clones, allowing the identification of the best rooting point for each genetic material. As regards the influence of time interval between collection/preparation and plantation of minicuttings, it was noticed that, in general, time intervals longer than two hours cause a decrease in the rooting and growth of plants. However, the studied clones responded differently to the imposition of the factor, indicating genotypic effect. With regards to the use of antioxidants in the minicuttings, varied responses were observed in the clones, due to the application of ascorbic acid and polyvinylpyrrolidone (PVP). The first one was favorable to the minicuttings from the clone with the lowest rooting percentage (C3); the second one, however, was unfavorable to the studied clones.