Performance of 'Cadenera' orange trees grafted on five rootstocks/Comportamento da laranjeira 'Cadenera' sobre cinco porta-enxertos

Citriculture is an important alternative for the agribusiness development in the state of Parana, Brazil. However, the use of a few cultivars of scion and rootstock restricts the harvest period and increases the vulnerability to pests and diseases. This study aimed to evaluate the vegetative growth, production and fruit quality of 'Cadenera' orange trees (Citrus sinensis (L.) Osbeck) grafted on five rootstocks, during nine harvests, under a subtropical environmental condition. The experimental design was randomized blocks with six replications, two plants per plot, and five rootstocks: 'Rangpur' lime (C. limonia Osb.), 'Cleopatra' (C. reshni hort. ex Tanaka) and 'Sunki' mandarins (C. sunki hort. ex Tanaka (L.) Raf.), 'Swingle' citrumelo [C. paradisi Macfad. x Poncirus trifoliata (L.) Raf.], and 'C-13' citrange [C. sinensis (L.) Osbeck cv. Pera x P.s trifoliata (L.) Raf.]. Biometric variables, and fruit yield and quality were analyzed. The smallest canopy size was induced by 'Rangpur' lime and 'C 13' citrange rootstocks. 'Swingle' citrumelo and 'C 13' citrange provided the highest yields for the 'Cadenera' sweet orange trees and were superior to 'Rangpur' lime. Trees grafted on 'C 13' citrange presented the highest yield and productive efficiency. Index Terms: Citrus spp; vegetative growth; postharvest quality; fruit yield. A atividade citricola e uma importante alternativa para o agronegocio no Estado do Parana. Entretanto, o uso de poucas cultivares, tanto de copa quanto de porta-enxerto, restringe o periodo de colheita e aumenta a vulnerabilidade da cultura a ocorrencia de pragas e doencas. O objetivo deste estudo foi avaliar o crescimento vegetativo, a producao e a qualidade de frutos da laranjeira 'Cadenera' sobre cinco porta-enxertos, durante nove safras, nas condicoes edafoclimaticas de Londrina-PR, Brasil. Foi adotado o delineamento experimental em blocos casualizados, com seis repeticoes, duas plantas uteis por parcela e, como tratamentos, cinco porta-enxertos: limoeiro 'Cravo' (C. limonia Osbeck), tangerineiras 'Cleopatra' (C. reshni hort. ex Tanaka) e 'Sunki' (C. sunki hort. ex Tanaka), citrumeleiro 'Swingle' [C. paradisi Macfad. x Poncirus trifoliata (L.) Raf.] e citrangeiro 'C 13' [C. sinensis (L.) Osbeck cv. Pera x P.trifoliata (L.) Raf.]. Foram analisadas variaveis biometricas, de producao e de qualidade dos frutos. O menor porte de copa foi induzido pelos porta-enxertos limoeiro 'Cravo' e citrangeiro 'C 13'. O citrumeleiro 'Swingle' e o citr