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玉米小斑病菌是一种异宗配合的子囊菌,菌系内自交不育,菌系间杂交也只能在具有亲和力的菌系间杂交才有可能产生子囊壳和子囊孢子,有的则只产生子囊壳而不形成子囊孢子。玉米小班病菌的单孢子(单分生孢子或单子囊孢子)菌系在有性交配上可分为两个交配型群A与a。在不同的地区,小斑病菌交配型A与a的频率是不同的。从而推测不同地区的小斑病菌,在当地通过有性杂交而出现的变异机率也是不同的。
Aspergillus solani is a heterogeneous with ascomycetes, inbred line of self-sterile, cross between strains can only be in the affinity between the strains of bacteria only possible to produce ascus shell and ascospores, while others are Only the ascapsial shell is produced without the formation of ascospores. The single spore (single conidia or single ascospore) bacterial strain of Xanthomonas oryzae can be divided into two mating type populations A and a in sexual mating. In different regions, the frequency of mating patterns A and A of B. hyopneumoniae is different. Thus speculated that different regions of the spot blotch bacteria in the local hybridization through the occurrence of mutation probability is different.