Seleção fenotípica de porta-enxertos de videira para tolerância ao alumínio, cultivados em solução nutritiva

Abstract

Brazil presents 20% of this territory occupied with savannah soil, that due to your high acidity and toxicicity for the aluminum hinder your use for cultivation. It was aimed at with this work to evaluate eight grapevine rootstock when submitted at different levels of aluminum in nutrition solution, with the purpose of selecting the most tolerant genotype to the aluminum. The grapevine rootstock with 30cm length were maintained by 30 days in cold camera. After this period they were moisturized with water + AIB for 24 hours in the concentration of 2000 mg L-1, being placed later to take root in vermiculite + sands (1:1) for 60 days and to proceed transferred for the vases with 3.5L of volume where the nutrition solution was contained. The genotype ‘Gravesac’, ‘IAC766’, ‘420A’, ‘IAC572’, ‘RR101-14’, ‘Kobber 5BB’, ‘1045 P’ and ‘1103P’ were submitted to the following treatments of aluminum (0, 10, 20 and 40 mg L-1 Al). After 40 days of cultivation were appraised the lengths of the aerial part, dry weight of the aerial part, length of the radicular system, dry weight of the radicular system and dry weight of the rootstock. The experimental designed was DIC in factorial 8x4 with 5 repetitions with 160 experimental portions. The largest length of the aerial part is obtained by the genotype ‘IAC766’ in the absence of aluminum, and for the genotype ‘420A’ with the 40 mg L-1. Larger dry weight of the aerial part and weigh dry of the rootstock ‘IAC572’ is obtained with 40 mg L-1. The largest length of the radicular system was obtained by the ‘Gravesac’ with 10 mg L-1. With relationship to the dry weight of the radicular system of the ‘1045 P’ shown a little sensitive in the concentration of 10 mg L-1. The cvs. ‘IAC572’’, ‘IAC766’ and ‘1103P’ presente a similar growth of the radicular system in the absence or presence of aluminum, the one that does suppose a good resistance to the toxicicity of this element.