测定了CY17，CY31突变菌系在感病品种铭贤169上的相对寄生适合度属性，并利用“病害量”衡量突变菌株的相对寄生适合度。

Relative parasitic fitness was detected on suscepitable wheat cultivars Mingxian 169 for mutants of the CY17 and CY31, and disease capacity was used in the experiment.

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近交衰退指近交个体的适合度相对下降的现象，它是近亲繁殖的主要障碍。

Inbreeding depression is the decrease of offspring fitness after inbreeding and is one of the primary forces selecting against the evolution of self-fertilization.

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