Research Notes : The genetic basis of physiological races of phytophthora
All characters of living organisms. whether morphological, physiological, or biochemical, undoubtedly are genetically determined. The ability of a Eew microorganisms to attack a limited range of plant species and the within-species variation in disease development also are presumed to have genetic bases. Such a variation in disease expression was used to develop the gene-for-gene concept (Flor, 1955).