RESUMO O objetivo deste trabalho foi avaliar os mecanismos de regeneração natural em três agrupamentos florísticos em remanescente de Floresta Ombrófila Mista, localizado em São

RESUMO -Louro-pardo (Cordia trichotoma (Vell.) Arrab. ex Steudel) é espécie arbórea que possui raízes gemíferas, nas quais, após a ocorrência de distúrbios de origem natural ou antrópica, ocorre a formação de brotos. Nessa espécie, ao considerar a habilidade natural de regeneração pelo sistema radicular, presume-se que esses propágulos constituem material com elevado potencial morfogenético. O objetivo deste trabalho foi avaliar a propagação vegetativa de louro-pardo por estaquia radicular. No primeiro experimento, raízes de mudas de louro-pardo foram seccionadas em estacas com 5,0 cm de comprimento, classificadas quanto ao diâmetro em grossas (1,6 -2,5 cm) e finas (1,0 -1,5 cm) e tratadas em solução de 0, 10, 20 e 30 mM de AIB, por 10 seg. No segundo experimento, os propágulos foram classificados quanto à posição de coleta na raiz das mudas em basais, medianas e apicais, seccionadas em estacas de 1,0; 3,0 e 5,0 cm de comprimento e tratadas em solução de 30 mM de AIB. O uso de AIB favoreceu o enraizamento das estacas radiculares, com maiores respostas nos tratamentos com a dose de 30 mM. Estacas radiculares com maior diâmetro mostraram-se mais aptas à brotação quando comparadas com as estacas radiculares menos espessas. As melhores respostas de brotação e enraizamento ocorreram em estacas radiculares basais e medianas com 3,0 e 5,0 cm de comprimento. Portanto, é possível realizar a propagação vegetativa de louro-pardo pela técnica de estaquia radicular.Palavras-chave: Espécie arbórea, Estacas radiculares, Louro-pardo, Produção de mudas. VEGETATIVE PROPAGATION OF Cordia trichotoma (VELL.) ARRAB. EX STEUDEL FROM ROOT CUTTINGSABSTRACT -Cordia trichotoma (Vell.) Arrab. ex Steudel is a tree species that has roots with buds and, after the occurrence of natural or anthropic disturbances, sprouts develop from these buds. Considering the natural ability of regeneration by root system, it is assumed that these propagules contain tissues with high morphogenetic potential. The objective of this study was to evaluate the vegetative propagation of C. trichotoma root cuttings. In the first experiment, seedling roots were sectioned into 5.0 cm-long cuttings, classified into thick (1.6-2.5 cm) and thin (1.0-1.5 cm) according to its diameter. The root cuttings were treated in a solution of 0, 10, 20 or 30 mM IBA for 10 seconds. In the second experiment, roots were classified into basal, median and apical according to the position of collection and cut in cuttings with 1.0, 3.0 and 5.0 cm of length. The root cuttings were treated in a solution of 30 mM IBA. The use of IBA favored rooting of root cuttings, with the highest responses in treatments with a dose of 30 mM. Thick root cuttings had a greatest potential for sprouting when compared to thin root cuttings. The highest responses of sprouting and rooting occurred in basal and median root cuttings with 3.0 and 5.0 cm length. In conclusion, it is possible to perform the vegetative propagation of C. trichotoma by the technique of root cuttings.

RESUMO O objetivo deste trabalho foi avaliar o estabelecimento e crescimento in vitro de plantas de grápia (Apuleia leiocarpa(

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This study aimed to evaluate the production of cordia (Cordia trichotoma) ministumps of seminal and asexual origin, as well as the effect of the naphthaleneacetic acid (NAA) on the rooting of mini-cutitings. Seedlings and plantlets from rootedIn clonal mini-hedge, the production of ministumps should vary among clones, management techniques, ministump age and vigor, among others factors (DIAS et al., 2012). The nutritional management has also been a determinant factor for the competency of mini-cutting rooting, because well-nourished propagules have high availability of endogenous auxin, amino acids, carbohydrates, and other substances that facilitate differentiation and root formation.Studies have shown that cordia (Cordia trichotoma), a native tree species of the Boraginaceae family, presents propagules with low-rooting competence, because unsatisfying rhizogenesis responses have been obtained in both mini-cuttings of adult shoots and cuttings (FICK, 2007;HEBERLE et al., 2010). As far as it is know, there are no references on cordia mini-cutting technology, which is the -NOTE -I

This study aimed to evaluate the rooting capability of apical and nodal mini-cuttings of ipe-roxo (Handroanthus

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