Heterologous diploid nuclei in the violet root rot fungus, Helicobasidium mompa
2003
Aimi, Tadanori | Iwasaki, Yoshinori | Kano, Sanae | Yotsutani, Yoshiki | Morinaga, Tsutomu
Allelic genes hgal-1 and hgal-2, which encode G protein alpha subunit in the violet root rot fungus, Helicobasidium mompa, were sequenced and characterized. Restriction fragment polymorphism (RFLP) analysis determined that the gene is present as a single locus in the single basidiospore isolates, while strain V169 possessed both alleles of this gene. Therefore, although basidiospore isolates are dikaryon, they are homokaryotic. Field-isolated strain V169, the putative parent strain, is a dikaryotic heterokaryon. Allelic genes hgal-1 and hgal-2 segregated in almost a 1:3 ratio among single basidiospore isolates from the same fruiting body. Moreover, the copy number of hgal-1 was found to be less than that of hgal-2 in the V169 strain. These results suggest that one of the nuclei in the V169 parent strain is homozygous diploid and the other heterozygous diploid. This parent strain produced four homokaryotic and dikaryon basidiospores on each basidium.
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