Resumo

QUIALA, Elisa et al. Influence of 6-Benzyladenine and gelling agent on the reduction of hyperhydricity in Tectona grandis L.. Rev. colomb. biotecnol [online]. 2014, vol.16, n.1, pp.129-136. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v16n1.44279.

The influence of different factors on shoot proliferation and the occurrence of hyperhydricity in teak (Tectona grandis L.) have been studied. Four concentrations of BA (2.22, 4.44, 6.66 and 8.88 µM) and a control treatment with 0 BA were examined. Aiming at reducing the costs during commercial propagation by using gelrite in stead of agar, the use of both gelling agent in the proliferation and hyperhydricity was tested. In order to evaluate if hyperhydricity can be reduced by increasing the gelrite concentration in the culture medium, three concentrations (2.0, 2.5 and 3.0 g L^-1) were tested in combination with 4.44 µM BA. The proliferation and occurrence of hyperhydricity during 21 successive subcultures were evaluated. The highest proliferation was achieved in the treatments with 6.66 or 8.88 µM BA. They yielded 5.22 and 5.56 shoots/explant, respectively. But also, the highest percent of hyperhydric shoots was achieved in this treatment. Gelrite resulted in a higher proliferation, but also an almost two times higher hyperhydricity as compared to agar-solidified media. Satisfactory reduction in hyperhydricity (18%) was achieved with 3.0 g L^-1 gelrite. However, the successive subcultures onto proliferation in this treatment favored hyperhydricity compromising shoot quality and it´s competence to proliferate. in vitro teak plants were ex vitro rooted and then transferred to greenhouse conditions for acclimatization; ten weeks after transfer they were ready for field plantation.

Palavras-chave : cytokinin; forestry; micropropagation; morpho-physiological disorder; teak.

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