Summaries (En, Pt); 30 ref.; 5 tables

Rooting capacity of semi-hardwood and hardwood cuttings of grapevine hybrids. This study aimed to analyze the natural rooting potential of grapevine hybrids using hardwood and semi-hardwood cuttings. The evaluated genotypes were grapevine hybrids from the cross between cultivars of the species Vitis labrusca and Vitis rotundifolia, the rootstocks ‘Paulsen 1103’, ‘IAC 766’ and ‘VR043-43’, and the cultivar Magnolia of the species V. rotundifolia. The branches used for the experiments were collected in the Fruit Sector of the Experimental Station of Canguiri of UFPR in Pinhais-PR. The hardwood cuttings were prepared 30 cm long and the semi-hardwood cuttings 6 cm long and a whole leaf at the top of the cutting. The cuttings did not receive rooting inducers. In hardwood cuttings, the hybrids IBRE421 and IBBT481 had the highest percentage of rooted cuttings (23.3%). The other hybrids showed very low or zero rooting rates and high rates of dead cuttings, revealing that the hybrids between V. labruscaand V. rotundifolia have great difficulty in forming roots in hardwood cuttings. With semi-hardwood cuttings, the rooting of the hybrids was better, ranging from 42.5 to 60%, similar to the rootstocks ‘Paulsen 1103’ and ‘VR043-43’. ‘IAC 766’ rootstock showed the highest percentage of rooted cuttings (97.5%). The grapevine hybrids, originated from the cross between V. labruscaand V. rotundifolia, have great difficulty in rooting with hardwood cuttings. Semi-hardwood cuttings allow the propagation of hybrids and grapevine rootstocks.

Keywords: Vitis rotundifolia, Vitis labrusca, cutting, muscadine

Este estudo teve por objetivo analisar o potencial natural de enraizamento de híbridos de videira com uso de estaquia lenhosa e semilenhosa. Os genótipos avaliados foram híbridos de videira oriundos do cruzamento entre cultivares das espécies Vitis labrusca e Vitis rotundifolia, os porta-enxertos ‘Paulsen 1103’, ‘IAC 766’ e ‘VR043-43’, e a cultivar Magnolia da espécie V. rotundifolia. Os ramos utilizados para os experimentos foram coletados no Setor de Fruticultura da Estação Experimental do Canguiri da UFPR em Pinhais-PR. As estacas lenhosas foram preparadas com 30 cm de comprimento e as estacas semilenhosas com 6 cm de comprimento e uma folha inteira na parte superior da estaca. As estacas não receberam indutores de enraizamento. Na estaquia lenhosa os híbridos IBRE421 e IBBT481 apresentaram as maiores porcentagem de estacas enraizadas (23,3%). Os demais híbridos apresentaram taxas muito baixas ou nulas de enraizamento e elevadas taxas de estacas mortas, revelando que os híbridos entre V. labrusca e V. rotundifolia possuem grande dificuldade para a formação de raízes em estacas lenhosas. Com estacas semilenhosas, o enraizamento dos híbridos foi melhor, variando entre 42,5 a 60%, semelhante aos porta-enxertos ‘Paulsen 1103’ e ‘VR043-43’. O porta-enxerto ‘IAC 766’ apresentou a maior porcentagem de estacas enraizadas (97,5%). Os híbridos de videira, originados do cruzamento entre V. labrusca e V. rotundifolia, apresentam grande dificuldade de enraizamento por estacas lenhosas. A estaquia semilenhosa permite a propagação dos híbridos e porta-enxertos de videira.

Palavras-chaves: Vitis rotundifolia, Vitis labrusca, estaquia, muscadínea