RESUMOMudas de progênies de polinização livre de 20 clones de cacaueiro (Theobroma cacao) foram inoculadas com o fungo Ceratocystis cacaofunesta, agente causal da murcha-de-Ceratocystis, e a resposta avaliada pelo percentual de plantas mortas. Progênies de polinização aberta dos clones TSH1188 e VB1151 foram usadas como padrões de resistência, e de CCN51 e SJ02 como suscetíveis. Foram estimados contrastes entre estes referenciais e as progênies em estudo, e avaliados pelo teste t de Dunnett (α = 0,05). As progênies apresentaram diferentes respostas a C. cacaofunesta sendo possível classificá-las em três grupos: resistente (FCB01, CSG70, BOBA01, VB902, TSH1188, VB1151, PS1319 e MAC01), moderadamente suscetível (HW25, PM02, FA13, PH15, M05 e BJ11) e suscetível (CCN51, FB206, PH16, SJ02, CCN10 e FSU77). Palavras-chave: Ceratocystis cacaofunesta, Theobroma cacao, melhoramento genético, seleção, teste t de Dunnett.
ABSTRACT
Resistance of progenies of cacao to Ceratocystis wiltSeedlings from open-pollinated progenies of 20 clones of cocoa (Theobroma cacao) were inoculated with the fungus Ceratocystis cacaofunesta, the causal agent of Ceratocystis wilt, and their response was assessed based on the percentage of dead plants. Open pollinated progeny of clones TSH1188 and VB1151 were used as standards for resistance, while CCN51 and SJ02 for susceptibility. Contrasts between these benchmarks and the progenies studied were estimated and evaluated by Dunnett's t test (α = 0.05). The progenies showed different responses to C. cacaofunesta, and it was possible to classify them into three groups: resistant (FCB01, CSG70, BOBA01, VB902, TSH1188, VB1151, PS1319 and MAC01), moderately susceptible (HW25, PM02, FA13, PH15, M05 and BJ11) and susceptible (CCN51, FB206, PH16, SJ02, CCN10 and FSU77).