Propagação vegetativa de Cordia trichotoma (Vell.) Arrab. ex Steudel por estaquia radicular

Abstract

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.

Production and rooting of cordia - Cordia trichotoma (Vell.) Arrab. ex Steud. mini-cuttings collected from ministumps of asexual and seminal origin

“…A major advance in vegetative propagation of cordia was the production of plantlets by rooting juvenile radicular minicuttings (KIELSE et al, 2013), which were used to successfully establish a clonal minihedge of the present research. Ministumps of seminal and asexual origin did not differ for mini-cuttings production, regardless of the concentrations of the nutrient solution for fertirrigation.…”

Shoot segment and substrate composition in rooting of juvenile ipe-roxo mini-cuttings

“…Thus, while carbohydrate quantity and root formation may be positively correlated, carbohydrates do not have regulatory function in these processes (HARTMANN et al, 2010). In louro-pardo (Cordia trichotoma), volume of root cuttings affected shooting but not rooting (KIELSE et al, 2013) and in alamo (Populus tremula x tremuloides) it affected rooting, but not shooting (STENVALL et al, 2006). The results of this study showed that commercial substrate and vermiculite, without the presence of sand in the composition, favor the survival and rooting of ipe-roxo mini-cuttings.…”

VEGETATIVE PROPAGATION OF Cordia trichotoma (VELL.) ARRAB. EX STEUD. BY CUTTINGS FROM SHOOTS AND ROOTS

“…In addition to the potential to compose a forest stands, the choice of a native species for commercial plantations depends strongly, among other factors, on the knowledge of silvicultural aspects related to the production of seedlings. In this context, Kielse et al, (2013) states that the propagation of cordia via seeds has been hampered by the rapid loss of viability, caused by the recalcitrant behavior to storage. Mafra (2019) also mentions that there are differences between the parent plants in relation to the potential for seed emergence and advises that cordia seeds should be planted soon after collection.…”

“…As for vegetative propagation, studies show that cloning this species is a challenge, and it was not possible to define an efficient plantlet production protocol so far (Fick, 2007;Heberle, 2010;Kielse, 2015;Kielse et al, 2013). The most expressive result was obtained by Kielse et al (2013) who observed 45% rooting of root cuttings treated with 30 mM of indolebutyric acid (IBA).…”