Studies Concerning the inheritance of Ascospore Length in Neurospora Crassa II. Selection Experiments With Wild-Type Strains

Abstract

Various types of selection with respect to ascospore length were practised with wild-type strains of Neurospora crass(L. The effect of all types of selection over 11 generations was essentially the same. A significant increase in mean ascospore length, a tendency for a decrease in the coefficient of variation, and a decrease in fertility were observed in each case. These results are discussed and a hypothesis to explain them is put forward.

Growth rate in Neurospora crassa: Linkage of polygenes

“…The polygenic control of growth rate has also been demonstrated in Aspergillus nidulans (JINKS, CATEN, SIMCHEN & CROFT, 1966), Schizophyllum commune (SIMCHEN & JINKS, 1964;SIMCHEN, 1966) and Collybia velutipes (CROFT & SIMCHEN, 1963;SIMCHEN, 1965). Similar findings were reported for the control of ascospore size in Neurospora crassa (PATEMAN, 1959;LEE, 1962). In addition, linkage of polygenes to known genetic markers has been demonstrated in these fungi (SIMCHEN, 1966;LEE & PATEMAN, 1959;CONNOLLY • SIMCHEN, 1968).…”