Abstract

CARDENAS-HERNANDEZ, Julián F; ALVAREZ-HERRERA, Javier Giovanni; BARRAGAN Q., Eduardo  and  RIVERA, Carlos Mauricio. Effect of gibberellic acid and 6-bencilaminopurine on bud development of cacao grafts (Theobroma cacao L.). Agron. colomb. [online]. 2010, vol.28, n.1, pp.19-27. ISSN 0120-9965.

Most of the cacao plantations of Colombia are certainly old and need to be renewed due to low yield. For this reason, the present work takes on the massive production of high yielding scions, which, notwithstanding, have shown grafting problems, specifically regarding bud initiation and further growth. In Nataima-Corpoica Research Center, located in the municipality of Espinal (Tolima, Colombia), buds of cacao clones CCN51 and ICS95 were grafted onto shoot tip excised seedlings of clone IMC67. The experiment followed a completely randomized design with seven treatments consisting in 5, 10 and 15 mg L^-1 solutions of both gibberellic acid (GA3) and 6-benzylaminopurine (6BAP), plus a hormone-free control. Scion height, length, diameter, number of leaves and foliar area were measured every three days. At the end of the experiment, which took a total of 30 days, scion fresh and dry mass were also determined. Regarding scion number of leaves, foliar area and fresh and dry mass, the highest counts were reached due to the GA₃ treatments. Besides the highest diameters, the 6BAP treated scions reached close records to those of the materials that received GA3, although sometimes exhibiting statistical differences. Among the GA₃ applications, the 10 mg L^-1 one showed the best results in both clones. In the control treatment, clone ICS95 developed larger foliar area and fresh and dry mass records than clone CCN51. However, after receiving the hormone treatments, both clones showed similar data.

Keywords : Clone IMC67; Clone CCN51; Clone ICS95; shoot tip excision; growth regulator.

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