Inheritance of resistance to anthracnose (Colletotrichum spp.) in pepper (Capsicum annuum L.). I. Genetic analysis of anthracnose resistance by diallel crosses

Inheritance of resistance to anthracnose (Colletotrichum spp.) in pepper (Capsicum annuum L.). I. Genetic analysis of anthracnose resistance by diallel crosses

1990

A:PS

Inheritance in pepper of resistance to anthracnose caused by Colletotrichum dematium f. sp. capsicum and C. gloeosporioides strain G was studied using a six-parent diallel in 1986. The parents and one set of F1 hybrids were grown at the Kyungpook National University Experiment farm. Detached green fruits and red fruits were inoculated by pricking through a drop of spore suspension and lesion diameter was measured for index of resistance. Mean squares for both general combining ability (GCA) and specific combining ability (SCA) were significant for inoculations of both green and red fruits with C. dematium, indicating that involvement of both additive and dominance effects in the lesion development. In inoculation with C. gloeosporioides strain G, mean squares for both GCA and SCA were significant for inoculations of green fruits, with mean square for GCA accounting for most of the genetic variability. However, neither GCA nor SCA effect was significant on red fruits. In response to C. dematium, resistance (small lesion) appear partially dominant to susceptibility (big lesion). Minimum number of effective factors involved in resistance was estimated 1 to 2. Both broad and narrow sense heritabilities were estimated high. In response of green fruits to C. gloeosporioides, resistance appeared partially dominant or overdominant. Broad sense heritability was high but narrow sense heritability was relatively low. [AS]

v.31(2):91-105, KOREAN SOCIETY FOR HORTICULTURAL SCIENCE, JOURNAL

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