Auxina e etileno no enraizamento do porta enxerto 'so4'

Abstract

This study aimed to evaluate the use of auxin and ethylene, alone or in combination, the cuttings rooting process rootstock 'SO4'. The study was conducted in a greenhouse of the Federal University of Pampa - Campus Dom Pedrito, with stakes of 'SO4' from a farm of Don Pedrito - RS, Brazil; The stems were collected during the winter period of the vine, and the stakes standardized with 2 egg yolks and about 1 cm in diameter. The treatments were: T1 = distilled water (control); T2 = indole-3-acetic acid (auxin) (1000 ppm); T3 = 2-chloroethyl phosphonic acid (ethylene) (2880 ppm) and; T4 = indole-3-acetic acid (auxin) (1000 ppm) + 2-chloroethyl phosphonic acid (ethylene) (2880 ppm) = [3880 ppm]; The experimental design was a completely randomized blocks, each treatment consisted of 4 replicates of 12 stakes totaling 48 cuttings per treatment. Was evaluated after 5 months: length of roots and shoots, rooting percentage, survival, dry weight of shoot and root part. The stakes submitted to T1 (distilled water) had the lowest root length (23.19 cm), the second lowest rooting (87.50%), on the other hand got the second best dry root mass index (36, 61%). The stakes of T2 (auxin) had the second lowest root dry weight ratio (34.61%), but had the second best rooting (91.66%) and the largest root length. The stakes submitted to T3 (ethylene) had the second lowest root length (24.50 cm) and rooting percentage (85.42%), but had a higher percentage of dry weight of roots (37.84%) and part air (51.86%). The stakes submitted to T4 (auxin + ethylene) had the lowest root dry weight ratio (33.56%), the second largest root length (25.46 cm) and the second best rooting percentage (93.75% ). We conclude that the soaking of the stakes in the plant hormone ethylene can help produce rootstocks 'SO4' with a higher percentage of dry weight of roots and shoots.