Efeito do porta-enxerto no teor de nutrientes em tecidos da videira 'cabernet sauvignon'

摘要

Grapevine mineral nutrition is an important factor influencing wine quality. For this, the effect of rootstocks on the nutrient content in different tissues of 'Cabernet Sauvignon' grapevines (Vitis vinifera L.) grown in the Serra Gaúcha region was evaluated. The experiment was carried out during the 2004/2005 vegetative cycle with the rootstocks Rupestris du Lot, 101-14, 3309, 420A, Kober 5BB, 161-49, SO4, and Paulsen 1103. The experimental design was in randomized blocks, with eight treatments, three replicates, four plants/plot. leaves - petioles were separated from the limbs -, clusters - berries were separated from the rachis -, and shoots were collected, dried in an oven, and weighted. N, P, K, Ca, and Mg were analyzed. Results show that there was a significant effect of the rootstock on the contents of N, P, K, Ca, and Mg in limb, petiole, rachis and berry of the 'Cabernet Sauvignon' grapevine. This effect varied as a function of the analyzed nutrient and tissue. But there was not a significant effect on the nutrients present in the shoot. Besides this, nutrient content varied according to the kind of tissue analyzed. In this way, contents of N and Ca were higher in limb; contents of P and K, in rachis; and contents of Mg, in petiole.