Crescimento de plantas micropropagadas de macieira em casa de vegetação com aplicações de ácido giberélico

摘要: foi o tratamento que proporcionou a maior taxa de crescimento das plantas (912% contra 114% nao-tratadas), alOm proporcionar com comprimento entrenUs e massa seca da parte aOrea. Plantas pulverizadas uma œnica vez nao apresentaram diferenAas significa- tivas em nenhuma variAEveis estudadas. Estes resultados sugerem uso do AG3 macieira, oriundas micropropagaAao, melhora crescimento, embora um nœmero pelo menos trŒs aplicaAies, associado concentraAies mais elevadas, seja necessAErio para melhorar eficiŒncia deste regulador. Termos indexaAao: Malus prunifolia, cultura in†vitro, adaptaAao, dormŒncia. Growth of micropropagated apple plants in greenhouse with gibberellic acid applications Abstract†n†Aiming to optimize plant growth the rootstock cultivar Marubakaido (Malus prunifolia) greenhouse, one-year old coming from in†vitro cultivation were sprayed once, twice and three times 7-day interval (GA3). The concentrations 0, 50, 100, 200, 400, 800 1,600†mg†L -1 used. Plant was evaluated every two weeks during months. Internode length, number buds dry mass aerial part also at end experiment. Three sprays GA3 800†mg L best treatment providing largest rate against non-treated plants) relation their initial height, be- sides larger internode length higher matter parts. Plants once did not present significant response for none studied variables. These results suggest that use GA3, micropropagation, improves growth, although least applications, associated high concentrations, is necessary improve efficiency this regulator.