Monokaryotic variation and haploid selection in Schizophyllum commune

Genetic variation and selection for fertility in the fungus Cochliobolus heterostrophus

“…The estimated difference of 57 effective factors influencing numbers of perithecia between generations one and five is consistent with the rapid increase in penthecial number due to selection, and the rapid decrease in additive genetic variance, both of which indicate that a relatively small number of polygenic units influence numbers of perithecia. Our estimate is similar to Simchen's (1966) estimates of effective factors for differences in growth rates between high and low selection lines of S. commune. His estimates ranged from 55 to 929 effective factors.…”

“…Selection in both directions over several generations for hyphal growth rate was effective in Neurospora crassa (Papa, Srb and Federer, 1966). Similar results were found for growth rate in Schizophyllum commune (Simchen, 1966). The response to selection in these studies was evidence of polygenic variation influencing these traits.…”

Non-allelic interactions and genetic isolation in wild populations of Aspergillus nidulans

“…In the absence of negative interactions a model of the type proposed by Simchen (1966) could explain the origin and nature of positive interactions. A situation is envisaged in which all individuals start from a common gene pooi controlling growth rate.…”

Use of genotype-environmental interaction analysis in the study of natural populations of Aspergillus nidulans

“…An examination of the genetical variance found within the progenies of crosses will reveal considerable information about the amount and nature of the difference in genotype between each pair of parental isolates (Croft and Simchen, 1965;Jinks et al, 1966;Simchen, 1966;Butcher, 1969). However, this method is inefficient in that a relatively large experiment is required in order to make a comparison of only two isolates.…”