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A obtenção de novas fontes de resistência à brusone é requerimento básico para melhoramento do arroz (Oryza sativa). O objetivo do trabalho foi avaliar, para resistência à brusone, 39 somaclones da cultivar CICA-8, desenvolvidos a partir de calos de panículas imaturas. Os somaclones, nas gerações avançadas de R5 a R7, foram avaliados sob condições naturais de infecção e em testes de inoculação artificial em casa de vegetação, utilizando cinco isolados, pertencentes a quatro patótipos (ID-14, II-1, IB-1 e IB-45) de Pyricularia grisea. No viveiro de brusone os somaclones apresentaram diferentes reações à doença. Nos testes de inoculação os somaclones mostraram interação diferencial com os isolados do patógeno. Dois isolados altamente virulentos a cinco somaclones foram selecionados para determinar a resistência parcial. Não houve interação significativa entre genótipos e isolados para o índice de resistência parcial determinado com base no número de lesões/cm² de folha. Quatro somaclones mostraram graus significativamente maiores de resistência parcial à brusone quando comparados à cultivar parental CICA-8. The development of rice blast resistance sources is a basic requirement for rice (Oryza sativa) breeding. The main objective of this investigation was to evaluate somaclones of rice cultivar CICA-8, developed from callus cultures of immature panicles for blast resistance. Rice blast in 39 somaclones was assessed in the advanced generations from R5 to R7, in the blast nursery under natural conditions of infection and in greenhouse inoculation tests, using five isolates pertaining to four pathotypes (ID-14, II-1, IB-1 and IB-45) of Pyricularia grisea. In the rice blast nursery, somaclones exhibited differences in disease reactions. In inoculation tests, somaclones showed differential interaction between isolates of the pathogen and genotypes. Two isolates highly virulent to five somaclones including CICA-8 and CO 39 were selected to determine the partial resistance. There was no significant interaction between isolates and somaclones for partial resistance index, determined based on leaf lesion number per cm². Four somaclones showed significantly higher degree of partial resistance when compared with the parent cultivar CICA-8

Resistência parcial à brusone em somaclones da cultivar de arroz CICA-8