Inheritance of adult-plant resistance to Phytophthora capsici in pepper

Inheritance studies were conducted to determine the genetic basis of adult-plant resistance in pepper (Capsicum annuum L.) to Phytophthora capsici. F sub(1), backcrosses and F sub(2) populations were developed using the resistant parent Criollo de Morellos 334 and susceptible parents Agronomico 10-G and Yolo Wonder. Pepper plants, at 36 days post-emergence, were inoculated near the base of the stem with an inoculum suspension of 5 x 10 super(4) zoospores/ml. Segregation ratios in the F sub(2) generation of 13 resistant to 3 susceptible plants fit a 2-gene model for resistance with dominant and recessive epistasis.