Abstract
ABSTRACT The objective of this work was to evaluate the vegetative propagation of Hymenaea courbaril (jatobá) and Apuleia leiocarpa (garapa) using the mini-cutting technique with the use of indolebutyric acid (IBA) growth regulator in different types of mini-cuttings. Two experiments were set up: the first involving the two species and three mini-cutting techniques (basal, intermediate and apical) in the presence and absence of IBA (4000 mg kg-1). In the second experiment, only the garapa species was evaluated by testing the same three mini-cutting techniques at four IBA concentrations: 0, 1000, 2000 and 4000 mg kg-1. The mini-cuttings were obtained from 6-month-old seedlings produced from seeds in a nursery. A randomized block design was used in a 3 x 2 x 3 factorial scheme (three mini-cutting techniques, two IBA concentration levels and three evaluation dates) in the first experiment, and a 3 x 4 x 3 factorial scheme (three mini-cutting techniques, four IBA concentrations and three evaluation dates) in the second experiment. At 90 days, jatobá had an average survival of 54%, with less than 5% of total rooting, without significant influence of the mini-cutting technique or IBA use. Garapa presented higher survival for the basal mini-cuttings in both experiments, which were the only ones that took root. IBA did not influence survival or rooting percentage of garapa mini-cuttings, but negatively influenced the root number, length and dry mass. We concluded that the basal mini-cutting is a viable technique for vegetative propagation of garapa, presenting 40% of rooting, but the propagation by mini-cutting for jatobá was not successful under the conditions of this study.
Highlights
Hymenaea courbaril L., popularly known as jatobá, has a wide geographical distribution, naturally occurring in the Amazon, Caatinga, Cerrado, Atlantic Forest, and Pantanal biomes in several states and regions of Brazil (Lima and Pinto, 2015)
The objective of this work was to evaluate the vegetative propagation of Hymenaea courbaril and Apuleia leiocarpa using the mini-cutting technique with the use of indolebutyric acid (IBA) growth regulator in different types of mini-cuttings
In view of the above, the objective of this work was to evaluate the potential of vegetatively propagating Apuleia leiocarpa and Hymenaea courbaril by testing different concentrations of IBA growth regulator and mini-cutting techniques
Summary
Hymenaea courbaril L., popularly known as jatobá, has a wide geographical distribution, naturally occurring in the Amazon, Caatinga, Cerrado, Atlantic Forest, and Pantanal biomes in several states and regions of Brazil (Lima and Pinto, 2015). Its wood is highly valued for having high density, hardness and mechanical resistance, and it is highly recommended for use in the furniture and construction industries (Lorenzi, 1992). F. Macbr., popularly known as garapa, grápia, or amarelão, belongs to the Fabaceae family, and has natural distribution in the Amazon, Caatinga, Cerrado, and Atlantic Forest biomes (Lima, 2015). It is a deciduous tree that reaches up to 35 m and 100 cm in diameter at breast height (Carvalho, 2003). Its wood has a high economic value with several uses. The species has irregular fruiting and a large size, making it difficult to collect its fruit (Carvalho, 2003)
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