Palavras-chave: Enzimas. Lamiaceae. Microporpagação. Ocimum basilicum L. ‘Genovese’.


O manjericão é uma erva perene. Objetivou-se com essa pesquisa avaliar a influência da concentração do meio de cultura associado a antioxidantes e reguladores de crescimento sobre o crescimento e atividade bioquímica de plântulas de manjericão cultivadas in vitro. Sementes da cultivar genovese foram inoculadas em meio Murashige e Skoog - MS suplementado com carvão ativado e reguladores de crescimento benzilamonopurina e ácido naftalenoacético. As plântulas cresceram em condições controladas durante 80 dias e após este período avaliou-se características biométricas e bioquímicas. Maior quantidade de plântulas anormais foi verificada no meio composto por MS 100%, sacarose 30 gL-1, BAP 0,4 gL-1 e ANA 0,2 gL-1 (T4) e (T1) sem reguladores. No entanto, esse mesmo tratamento incrementou o número de folhas, e massa e fresca seca das brotações. A atividade antioxidante foi maior nas plântulas que foram mantidas no T5 - 100% MS, carvão ativado 3,0 gL-1+ 0,4 mgL-1 BAP + 0,2 mgL-1 ANA e no T3 - 70% MS, carvão ativado 3,0 gL-1+ 0,1mgL-1 BAP. A análise enzimática revelou que a enzima superóxido dismutase apresentou maior atividade em todos os tratamentos quando comparada com a catalase e a ascorbato peroxidase. Sendo assim, as plântulas de manjericão genovese que cresceram no T4 e T1 apresentaram melhores médias de crescimento em folhas e menor atividade antioxidante. Já as plântulas que cresceram no T3 apresentaram médias maiores para as enzimas catalase e ascorbato peroxidase.



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