Enraizamento de estacas de atemoieira (Annona Cherimola Mill. x A. squamosa L.) cv. Gefner submetidas a tratamento lento e rápido com auxinas

Abstract

This study aimed to evaluate the effect of different auxin concentrations in the rooting of atemoya (Annona cherimola Mill. x A. squamosa L.) cv. Gefner stacks, employing slow and fast treatments. The experimental design used was completely randomized, in 3x7 factorial arrangement (auxins x concentrations), with 5 replicates of 12 stacks per plot, for each auxin application method (slow and fast). Stacks were treated with plant growth regulators by bottom immersion in a solution containing IBA, NAA and 2,4-D for 24 hours (slow treatment) at the following concentrations: 0 (control), 50, 100, 200, 300, 400 and 500 mg L-1 of each growth regulator and for 5 seconds (fast treatment) at the concentrations: 0 (control), 500, 1000, 2000, 3000, 4000 and 5000 mg L-1 of each growth regulator. The evaluated variables were: percentage of surviving, rooted and surviving-with-callus stacks; root length per stack; percentage of rooted stacks with remaining leaves, sprouting, and remaining leaves and sprouting. For the rooting of stacks of atemoya cv. 'Gefner', it was concluded that the slow treatment with 200 mg L-1 of NAA increased the rooting process, similar to fast treatment with IBA, regardless of concentrations.