GIBBERELIC ACID APPLICATION IN MICROPROPAGATED ‘MARUBAKAIDO’ ROOTSTOCK APPLE PLANTLET

Abstract

After the acclimatization micropropagated plantlets can showed stop of vegetative growth characterized as a dormency type. For the overcoming of the dormency and return to the growth of the plants applications of Gas are frequent efficient. The objective of this work was to evaluate the effect of different concentrations of giberellic acid (GA3) on the growth of micropropagated Marubakaido rootstocks apple plantlet. The plantlets in greenhouse with approximately three cm of height, had received biweekly applications from GA3 in the concentrations of 0, 400 and 800 mg.L-1 in a total of three applications. After 15 days of the last application of the GA3 one evaluated it height from the plants, leaf number, percentage of plants with bud tip opened and percentage of plants with bunch lateral. The largest concentration of GA3 (800 mg.L-1) was the best for the majority the variables analyzed, and the concentration of 400 mg.L- 1 differing significantly from non-treated plants to variables number of leaves and percentage of bud tip opened. The GA3 improve the growth micropropagated Marubakaido rootstock apple plantlet after the acclimatization.