RESUMO O objetivo deste trabalho foi avaliar a produção de mudas de laranjeiras doces ‘Pera’ e ‘Westin’, tangerineira-tangor ‘Piemonte’ e limeira-ácida ‘Tahiti’ enxertadas em 14 porta-enxertos de citros em viveiro protegido. As mudas de laranjeiras-doces ‘Pera D-6’ e ‘Westin’, tangerineira-tangor ‘Piemonte’ e limeira-ácida ‘Tahiti CNPMF-02’ foram avaliadas em viveiro protegido após a enxertia, em 11 porta-enxertos híbridos: citrandarins ‘Indio’, ‘Riverside’ e ‘San Diego’, citrumelo ‘Swingle 4475’, HTR-051, TSKC x (LCR x TR)-040 e 059, LVK x LCR-010 e 038, TSKC x CTTR-002 e TSKC x CTSW-041, além de trifoliata ‘Flying Dragon’, limoeiro ‘Cravo Santa Cruz’ e tangerineira ‘Sunki Tropical’. Coletaram-se variáveis biométricas e fisiológicas, sendo o delineamento experimental em blocos ao acaso, em parcelas subdivididas, com 56 tratamentos, três repetições e dez plantas na parcela. Independentemente do porta-enxerto, a limeira-ácida ‘Tahiti CNPMF-02’ foi a copa mais vigorosa em viveiro, seguida da tangerineira-tangor ‘Piemonte’ e, por fim, pelas laranjeiras ‘Pera-D6’ e ‘Westin’. A tangerineira ‘Sunki Tropical’ induziu maior crescimento vegetativo e de sistema radicular em combinação com todas as copas estudadas. O trifoliata ‘Flying Dragon’ e o híbrido HTR-051 necessitam de maior período para a formação das mudas em função do menor vigor desses genótipos, em combinação com todas as variedades copas avaliadas. Não se observaram quaisquer sintomas de incompatibilidade entre as variedades no viveiro.
ABSTRACT The aim of this study is to evaluate the performance of sweet orange seedlings ‘Pera’ and ‘Westin’, mandarin-Murcott ‘Piedmont’ and acid lime ‘Tahiti’ grafted on 14 citrus rootstocks in protected nursery. The citrus nursery tree production of ‘Pera D-6’ and ‘Westin’ sweet oranges, ‘Piemonte’ tangor and ‘CNPMF-02’ Persian lime was evaluated in screen house after budding onto 11 hybrid rootstocks: ‘Indio’, ‘Riverside’ and ‘San Diego’ citrandarins, ‘Swingle 4475’ citrumelo and HTR-051, TSKC x (LCR x TR)-040 and 059, LVK x LCR-010 and 038, TSKC x CTTR-002 and TSKC x CTSW-041, besides ‘Flying Dragon’ trifoliate, ‘Santa Cruz’ Rangpur lime and ‘Tropical’ Sunki mandarin. Biometric and physiological variables were collected, and the experimental design was split-plot randomized blocks in 4 x 14 factorial, with three replications and ten trees in the unit. ‘CNPMF-02’ Persian lime was the most vigorous scion variety, followed by ‘Piemonte’ tangor and the sweet oranges for the last, regardless of the rootstock. Citrus nursery trees budded onto ‘Tropical’ Sunki mandarin had higher vegetative and root system growth in combination to all scion varieties evaluated. Citrus nursery trees budded onto ‘Flying Dragon’ trifoliate and the HTR-051 hybrid need longer period to complete adequate growth due to their lesser vigor induced to all scion varieties. No incompatibility symptoms were observed in the nursery.