Abstract
Sequoia is a species that provides large volumes of wood, is resistant to decomposition and has seedling production by mini-cutting as a viable alternative. The aim of this work was to evaluate the rooting of mini-cuttings of different clones of Sequoia sempervirens and subsequent use of different concentrations of IBA in clones with low adventitious rooting. Mini-cuttings of different clones were used, from clonal mini-garden. In the experiment with the growth regulator, different concentrations of IBA (from 0 mg L -1 to 3000 mg L -1 ) were used. The material was placed to be rooted in a mini-tunnels and evaluate at 90 days. All experiments were installed in a completely randomized design, with a subsequent evaluation of survival (%), mini-cuttings with calluses (%), mini-cuttings rooted (%) and number of roots (only in the experiment with different concentrations of IBA). In the first experiment, the survival of mini-cuttings was high (close to 95%) and rooting showed great variation among the clones (22.8 to 100%). In the second experiment, using clones that previously presented rooting less than 50%, submitted to IBA application, high survival (88.1 to 99.4%) was observed. The clones presented different responses among themselves, but with improve in the rooting using growth regulator.
Highlights
We aim to evaluate the rooting of mini-cuttings of different clones Sequoia sempervirens and the subsequent use of different concentrations of indole butyric acid (IBA) in clones with low adventitious rooting
Cuttings with a size of 10.0±2 cm of length and 0.7±2 cm of diameter containing a pair of acicular leaves reduced to 50% of the leaf area and treated with 6.000 mg L-1 of indole-3-butyric acid (IBA)
In the first experiment, evaluating the rooting of mini-cuttings of different clones, there was a significant difference between the three variables analyzed (Table 1)
Summary
Don) Endl.), is a conifer native to the west coast of the state of California and the southwest coast of the state of Oregon in the United States, corresponds to a well-known species, mainly because it is one of the highest, reaching more than 100 meters in ideal conditions of growth. It is a species used when there is a need for wood resistant to decomposition (OLSON et al, 1990). Seed germination is highly variable, presenting many empty seeds and with malformed or infected embryos with several
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