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Efeitos de reguladores vegetais na propaga??o vegetativa do porta-enxerto de videira '43-43' (Vitis vinifera x V. rotundifolia)

DOI: 10.1590/S0100-29452005000100004

Keywords: grapes, cuttings, rooting, paclobutrazol, iba, auxins.

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Abstract:

this work aimed to develop a methodology of vegetative propagation for the vine rootstock '43-43'. hardwood cuttings collected in august, softwood cuttings collected in january and semi-hardwood cuttings collected in march were immersed in solutions, by 10 minutes, containing different doses of the plant regulators paclobutrazol (0, 100 and 200 mg.l-1) and indole butyric acid (0, 500 and 1,000 mg.l-1), combined or not, totalizing nine treatments for each kind of cutting. sixty days after planting the cuttings, the following variables were evaluated: percentage of rooted cuttings, number of roots, fresh weight of roots and percentage of sprouted cuttings. the hardwood cuttings presented 100% of sprouted cuttings, but it was not verified rooting, independent of the utilization of plant regulators. the softwood cuttings that were not treated with plant regulators showed 92% of rooting and 84% of sprouting. for this king of cutting the iba at 1,000 mg.l-1 increased the number of roots. the semi-hardwood cuttings had the highest percentage of rooting (23.5%) when they were treated with iba at 1,000 mg.l-1. this treatment also propitiated the maximum fresh weight and number of roots, nevertheless, these values were inferior to those verified for softwood cuttings.

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