Cryptococcus neoformans is a fungal human pathogen with a bipolar mating system. It undergoes a dimorphic transition from a unicellular yeast to hyphal filamentous growth during mating and monokaryotic fruiting. The traditional sexual cycle that leads to the production of infectious basidiospores involves cells of both alpha and a mating type. Monokaryotic fruiting is a modified form of sexual ...

M A T I N G type determination and inheritance in Paramecium caudatum has been reported only for syngen 12 (HIWATASHI 1958). Inheritance was usually synclonal, i.e. the two clones derived from the two members of a conjugating pair are identical in mating type expression, indicating direct genic control of mating type. However the breeding analysis was incomplete and some of the observations, as...

Ascospores of Neurospora tetrasperma normally contain nuclei of both mating-type idiomorphs (a and A), resulting in self-fertile heterokaryons (a type of sexual reproduction termed pseudohomothallism). Occasional homokaryotic self-sterile strains (either a or A) behave as heterothallics and, in principle, provide N. tetrasperma with a means for facultative outcrossing. This study was conceived ...

Fungal populations that reproduce sexually are likely to be genetically more diverse and have a higher adaptive potential than asexually reproducing populations. Mating systems of fungal species can be self-incompatible, requiring the presence of isolates of different mating-type genes for sexual reproduction to occur, or self-compatible, requiring only one. Understanding the distribution of ma...

In Saccharomyces cerevisiae, meiosis and spore formation as well as mating are controlled by mating-type genes. Diploids heterozygous for mating type (aalpha) can sporulate but cannot mate; homozygous aa and alpha-alpha diploids can mate, but cannot sporulate. From an alpha-alpha diploid parental strain, we have isolated mutants which have gained the ability to sporulate. Those mutants which co...

Mid1 is a putative stretch-activated Ca2+ channel component and is required for the maintenance of viability in the mating process. In response to mating pheromone, the mid1 mutant normally forms a pointed mating projection but eventually dies. This phenotype is called the mid phenotype. To identify a protein regulating Mid1 or regulated by Mid1, we isolated a multicopy suppressor that rescues ...

We inoculated Tuber aestivum and sinoaestivum on Carya illinoinensis to explore the effects of inoculation host plant growth, enzyme activities, physicochemical properties rhizosphere soil, denitrifying bacterial community in rhizosphere, distribution mating type genes rhizosphere. found that spp. increased height stem circumference was greater two months after inoculation. Six inoculation, per...

Minority male mating advantage was tested in wild type strains of Drosophila ananassae through multiple-choice experiments. Mating success of two types of flies present in five different ratios was scored by direct observation in an Elens-Wattiaux mating chamber. We found no evidence for minority male mating advantage in wild type strains of D. ananassae. The relative mating success of two type...

The genome has a non-random spatial distribution in the cell nucleus. In Schizosaccharomyces pombe, it has been shown that the centromeres, telomeres and the mating-type region localize to the nuclear membrane (NM), the former by attaching to the spindle pole body (SPB). In addition, reporter genes inserted into these areas are transcriptionally repressed because of the formation of specialized...