Genetic Aspects of Antibiosis to Aphis gossypii in Cucumis melo from India1

Abstract

Reproduction of the melon aphid, Aphis gossypii Glover, varied on different plants of Cucumis melo L., PI 371795, and its inbreds. Successive generations of selection and inbreeding increased uniformity and potency of antibiosis. Aphid reproduction on F 1 , F 2 , and backcross hybrids from a resistant × susceptible cross indicated that a single, dominant major gene conferred some antibiosis; but variation within resistant and susceptible classes indicated that additional, minor genes caused effects similar to those found in resistant inbreds.