Estaquia Lenhosa De Porta-Enxertos De Videira Promissores Para Regiões Com Histórico De Morte De Plantas

Abstract

RESUMO -O objetivo deste trabalho foi avaliar o uso de concentrações de ácido indol-3-butírico (AIB) na estaquia lenhosa de cultivares de porta-enxertos de videira promissores para o Sul do Brasil. Material vegetal de porta-enxertos de videira foi coletado de plantas-matrizes pertencentes à coleção da Estação Experimental da EPAGRI, no município de Videira -SC. O experimento foi conduzido em casa de vegetação no período de julho a outubro de 2013. O delineamento experimental foi o inteiramente casualizado, com 20 tratamentos, dispostos em esquema fatorial 4x5, formado por quatro porta-enxertos (VR043-43, Dogridge, Richter 99 e EEV793-5) e cinco concentrações de AIB (0; 1.000; 2.000; 3.000 e 4.000 mg L -1 ). Após 60 dias, foram avaliados a porcentagem de enraizamento, o número, o comprimento e a matéria fresca de raízes das estacas. A aplicação de AIB aumentou a porcentagem de enraizamento, o número, o comprimento e a massa fresca de raízes para todos os porta-enxertos utilizados. O porta-enxerto VR043-43 apresentou melhor desenvolvimento radicular que os demais porta-enxertos estudados. Para a propagação das quatro cultivares de porta-enxertos de videira avaliados via estaquia lenhosa, recomenda-se a aplicação de AIB na concentração de 1.000 mg L -1 . Termos para indexação: viticultura, ácido indol-3-butírico, propagação. ROOTING OF HARDWOOD CUTTINGS OF PROMISING GRAPEVINE ROOTSTOCKS FOR REGIONS WITH HISTORY OF PLANTS' DEATHABSTRACT -The aim of this study was to evaluate the concentrations of indole-3-butyric acid (IBA) in hardwood cuttings of promising grapevine rootstocks for southern Brazil. Plant material was collected from selected plants from the grapevine rootstock collection of EPAGRI Experimental Station, in the city of Videira -SC . The experiment was conducted in a greenhouse during the period from July to October 2013. The experimental design was completely randomized with 20 treatments arranged in a 4x5 factorial scheme, consisting of four rootstocks ( VR043-43, Dogridge, Richter 99 and EEV793-5 ) and five IBA concentrations ( 0 , 1.000 , 2.000, 3.000 and 4.000 mg L -1 ). After 60 days, it was evaluated the rooting percentage, the number, length and the fresh weight of the roots. The use of IBA increased rooting percentage, number, length and fresh weight of roots for all rootstocks. The rootstock VR043-43 showed better root development than the other rootstocks studied. To propagate the four cultivars of grapevine rootstocks evaluated via hardwood cuttings it is recommended the use of IBA at 1000 mg L -1 .

Rooting potential of grapevine rootstocks cuttings

“…In general, there is no difficulty in root cuttings for the production of grapevine rootstocks, when propagated by wood cuttings (Tecchio et al, 2007). However, rootstocks originated from V. rotundifolia hybrids like VR043-43 (Vitis vinifera x V. rotundifolia) require the application of 1,000 to 3,000 mg L -1 of indole-3-butyric acid (IBA) for rooting and multiplication of cuttings (Salibe et al, 2010;Bettoni et al, 2015). The IBA is one of the most used growth regulators for rooting, because even in high concentrations it is not toxic, in addition it is effective for several species (Blythe et al, 2007).…”

“…The plant material was prepared according the methodology described by Bettoni et al (2015), in which the canes were segmented on cuttings with approximately 30 cm in length, then those with 8 to 10 mm in diameter were selected. At the base of each cane, a transversal cut was made, 0.5 cm below the last bud, and at the apex of the cane, the cut was made in bevel, 3 cm above the last bud.…”

Biostimulants and indolebutyric acid improve rooting of wood cuttings from different grapevine rootstocks

“…Thereafter, the cuttings underwent stratification in a cooling chamber, with an average temperature of 2 ºC ±1 ºC, for 10 days. Afterwards, two lesions were made in the longitudinal direction, approximately 3 cm long, at the base of each cutting (Bettoni et al, 2015).…”