Effect of auxin Concentration and cutting type on rooting of nemaguard, St Julien A, tetra and GF677 cuttings

For vegetative propagation of Nemaguard, St Julien A, Tetra and GF677 rootstocks via cutting, two separate investigations were carried out in a factorial experiment based on completely randomized design. Semi hard wood cuttings were taken in late August and then treated with concentrations of 0, 1500, 2000, 2500 and 3000 mg/l IBA. Cuttings were cultured in perlite medium and in a greenhouse with mist system. In December, hardwood cuttings were taken and treated with concentrations of 0, 2500, 3000, 3500 and 4000 mg/l IBA. Cuttings were cultured in green house that equipped with bottom heat. After two months, the percentage of rooting, root number and root length were recorded. The results showed that semi hardwood cuttings of GF677 and then Nemaguard and tetra had the highest of root number and the most rooting percentage. Root length of these three rootstocks was not significantly different from each other. St Julien A was shown the lowest rooting. Most appropriate concentration for semi hard wood cutting was 2000, 2500 and 3000 mg/l IBA. Hardwood cuttings of GF677 in 4000 mg/l IBA treatments were produced the most number of roots and the highest of rooting percentage. Hardwood cuttings of tetra were not shown any rooting. Rooting percentage of semi hardwood cuttings was higher than hardwood cuttings. In general, application of semi hard wood cutting of these rootstocks and treatment of those with concentrations of 2000 and 2500 mg/l IBA is advisable.