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A atividade de peroxidases e a concentração de fenóis apresentam uma grande importância na união entre o enxerto e o porta-enxerto, podendo, desta forma, influenciar as respostas de estresse da incompatibilidade no processo de enxertia. O presente trabalho objetivou quantificar a atividade das peroxidases e dos fenóis totais em cultivares de Prunus sp. Amostras de casca e de lenho foram processadas e quantificadas por espectrofotometria, a partir dos porta-enxertos de pessegueiros GF 677, Okinawa, Capdeboscq e Aldrighi e de ameixeiras Mirabolano e Marianna comum, cultivados nos viveiros do Departamento de Fitotecnia da FAEM/UFPel. Concluiu-se que a atividade das peroxidases e dos fenóis totais varia entre porta-enxertos, período de crescimento e tipo de tecido; a maior atividade das peroxidases e dos fenóis totais ocorre nos porta-enxertos Mirabolano e Marianna; a atividade das peroxidases e dos fenóis totais é maior na casca do que no lenho; no período de dormência, ocorre maior atividade das peroxidases e menor quantidade de fenóis totais, sendo o inverso no período vegetativo. The peroxidase activities and total phenols present a great importance in the union between the stock and the rootstock, and this is a way to evaluate the response to stress of the incompatibility in the graft process. This work aimed to quantify peroxidase activities and total phenols in order to verify its influence on the physiological and biochemical processes of Prunus sp. cultivars grafting. Those metabolic processes the samples in the bark and wood were processed and quantified by spectrophotometry, starting from peach rootstock GF 677, Okinawa, Capdeboscq and Aldrighi; and plum rootstock cv. Mirabolano and Marianna Comum, from nurseries of the Department of Plant Science of FAEM/UFPel. It is concluded that: peroxidase and the total phenol activities vary among rootstocks, growth period and tissue type; the highest peroxidase activities and total phenols occurred in Mirabolano and Marianna rootstoks; the peroxidase activities and total phenols were higher in the bark than in wood; the largest peroxidase activities occurs during the rest period and lower amount of total phenols, being the contrary in the vegetative period

Peroxidases e fenóis totais em tecidos de porta-enxertos de Prunus sp. nos períodos de crescimento vegetativo e de dormência