National Peanut Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Dawson, Georgia 39842, USA.
Mycologia. 2011 Jan-Feb;103(1):174-83. doi: 10.3852/10-115. Epub 2010 Jun 17.
Sexual reproduction was examined in the aflatoxin-producing fungus Aspergillus nomius. Crosses between sexually compatible strains resulted in the formation of multiple nonostiolate ascocarps within stromata, which places the teleomorph in genus Petromyces. Ascocarp and ascospore morphology in Petromyces nomius were similar to that in P. flavus and P. parasiticus, and differences between teleomorphs were insufficient for species separation. Formation of mature ascocarps was infrequent, with only 24% of the 83 crosses producing viable ascospores. The majority of P. nomius strains contained a single mating-type gene (MAT1-1 or MAT1-2), but several strains contained both genes. MAT1-1/MAT1-2 strains were self-sterile and capable of mating with both MAT1-1 and MAT1-2 strains; hence P. nomius appears to be functionally heterothallic.
性繁殖在产黄曲霉素真菌构巢曲霉中进行了研究。在具有性亲和性的菌株之间进行杂交,导致在菌核内形成多个非梗的子囊果,这将其同型结合体置于拟青霉属中。在拟青霉 nomius 中的子囊果和子囊孢子形态与黄曲霉菌和寄生曲霉菌相似,而同型结合体之间的差异不足以进行物种分离。成熟子囊果的形成不频繁,只有 83 次杂交中的 24%产生有活力的子囊孢子。大多数拟青霉 nomius 菌株含有单个交配型基因(MAT1-1 或 MAT1-2),但有几个菌株含有这两个基因。MAT1-1/MAT1-2 菌株是自育不育的,能够与 MAT1-1 和 MAT1-2 菌株交配;因此,拟青霉 nomius 似乎在功能上是异宗配合的。