The resistance of ICA70 to race CYR31 was controlled by complementary action of one dominant gene and one recessive gene, and the resistance to race CYR32 by one recessive.

• ICA70对条中31表现出由1对显性基因和1对隐性基因的互补作用控制，而对条中32表现为由一对隐性基因控制。