Establishment of Eucalyptus grandis W. Hill ex Maiden in vitro using commercial products for seed treatment

Given the current demand for timber from forest species, there is a need to develop new strategies for the mass propagation of eucalyptus. Therefore, this study aimed to determine the effect of different doses of Standak Top® and CoMo Raiz® on the establishment of Eucalyptus grandis W. Hill ex Maiden from seeds in vitro. The experimental design was completely randomized in a 4 × 3 + 1 factorial arrangement (four concentrations: 1, 2, 3, and 4 mL L-1 of the commercial products Standak Top®, CoMo Raiz®, a mixture of both, and a control treatment) with 20 replicates. The following characteristics were evaluated: Contamination level, shoot length, and the number of leaves. No contamination was observed for the different doses of Standak Top®. Additions of 1 to 3 mL L-1 of Standak Top® to the culture media yielded the greatest shoot length, and the additions of 2 to 3 mL L-1 yielded the greatest number of leaves. Mixing Standak Top® and CoMo Raiz® did not significantly enhance the measured characteristics.Keywords: Standak Top®, CoMo Raiz®, tissue culture, asepsis, culture mediaAfrican Journal of Biotechnology Vol. 12(25), pp. 3963-396

In vitro cultivation of zygotic embryos from Murici (Byrsonima cydoniifolia A. Juss. ): establishment, disinfection, and germination

The objective of this study is to establish an in vitro germination and cultivation protocol for murici (Byrsonima cydoniifolia A. Juss.) using zygotic embryos. Therefore, three assays were performed: in assay I, embryo asepsis was tested at exposure times of 5, 10, 15, 20, 25, and 30 minutes in 2.5% sodium hypochlorite, with or without immersion in 70% alcohol; in assay II, MS (MURASHIGE; SKOOG, 1962) e WPM (LLOYD; McCOWN, 1980) culture media were tested at salt concentrations of 25, 50, and 100%, with or without the addition of sucrose, to germinate the buds; in assay III, seedling growth was evaluated in MS and WPM culture media at salt concentrations of 25, 50 and 100%. Sodium hypochlorite (2.5%) with or without 70% alcohol was used to avoid contamination because it was not toxic to murici embryos. Water-agar was the most appropriate culture medium for bud germination, and 50% WPM was appropriate for seedling growth