GENETIC ANALYSIS FOR RESISTANCE TO ANTHRACNOSE CAUSED BY Colletotrichum acutatum IN CHILI PEPPER (Capsicum annuum L.) USING DIALLEL CROSSES

Abstract. Anthracnose caused by Colletotrichum acutatum is one of the most destructive diseases of chili pepper in Indonesia. Genetic analysis for chili pepper resistance to anthracnose caused by C. acutatum was evaluated by full diallel analysis. The F1 and parent plants were grown in randomized complete block design with four replications. Forty green chili pepper fruits obtained from each genotype were inoculated with C. acutatum PYK 04 isolate using the method developed by AVRDC then divided into four groups for replication purposes. Data from F1 generation and parents were analyzed using the Hayman and Griffing methods. Results indicated that epistasis effect was not significant for resistance to anthracnose. Additive genetic effects were larger than the dominant effects. IPB C15 genotype contained a high proportion of recessive alleles. Dominant genes outnumbered recessive genes in the parent populations. Narrow-sense and broad-sense heritability were medium. The selection for resistance to C. acutatum on chili pepper breeding programs should be conducted on later generations and the multiple crosses method with transgressive recombination is recommended.

Key words: chili pepper, resistance, anthracnose, Colletotrichum acutatum

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