Showing papers by "David A. Jones published in 1965"
TL;DR: Studies on the ability of wild isolates of Aspergillus glaucus to form heterokaryons voluntarily, that is without the use of auxotrophs are described.
Abstract: THERE are two main functions of sexual reproduction; the reassortment of genetic variability and the production of younger individuals from those which are ageing. The latter is probably a secondary effect of the process. With homothallic sexually reproducing fungi heterokaryosis is prerequisite for the redistribution of genetic information at meiosis yet Grindle (i963a, b) has shown that the frequency of heterokaryon formation between different isolates of Aspergillus nidulans Eidam is very low. He found moreover, that regardless of the locality from which they were derived, the compatible isolates were usually extremely similar in morphology. Jinks (i) discovered marked ageing effects in the related fungus Aspergillus glaucus, this being exemplified by the reduction in the number of perithecia formed and the onset of vegetative death. Although with Aspergillus nidulans Jinks (1954) obtained a form without perithecia after 14 propagations by asexual spores and Croft (1964) has reduced the perithecial density in some isolates by selective techniques, vegetative death has not yet been observed in this fungus. Because of this difference between the two species the frequency of heterokaryon formation in Aspergillus glaucus is now of particular interest. This report describes studies on the ability of wild isolates of Aspergillus glaucus to form heterokaryons voluntarily, that is without the use of auxotrophs.
19 citations