Specific effects of temperature on recombination in Schizophyllum commune

Genetic control of recombination in Schizophyllum commune: specific and independent regulation of adjacent and non-adjacent chromosomal regions

“…By contrast, the higher meiotic temperature (32° C.) induced pronounced heterogeneity in frequencies of recombination in two of the sub-regions of A as well as in the B factor (table 7). We shall not discuss further the effect of the change in temperature on recombination in the various genotypes as this is done elsewhere (Stamberg and Simchen, 1969). Table 7 shows quite clearly that genotypic variation in frequencies ofrecombination in A-pab and pab-ade5 does not affect the ade5-A13 sub-region.…”

“…51'1'" ***P <0001 (highly significant) Table 3 demonstrates quite clearly that recombination in nic2-ural is under a separate genetic control from that of Bc-Bfl, as recombination in the latter region does not vary significantly, in contrast to the former region (Ac-A seems to change similarly to nic2-ural, although the correlation is not significantly different from zero; we have, however, established the independence of the controls of these two regions in table 2). Further evidence that recombination in the three chromosomal regions is subject to different control systems is given by the response of the various crosses to a change in the meiotic temperature from 18° C. to 32° C. (Stamberg and Simchen, 1969).…”

“…The exact nature of the relationship between the controlled segments and their controlling genes is unknown at present, but because the regulation of recombination is region-specific, some means of recognition must be involved. The implications of these findings have been discussed in more detail elsewhere (Simchen and Stamberg, 1969). …”

“…Unfortunately, only little is known about these genes and their actual role in the process of recombination. We have recently suggested that two types of gene systems may be involved in the control and regulation of recombination, the "coarse" and the "fine" (Stamberg, 1968;Simchen and Stamberg, 1969). These two types of control differ with regard to the following criteria: magnitude of effect on recombination, extent of genome affected, occurrence of natural variation, type of organism exhibiting the effect, and evolutionary role.…”

The organisation of the incompatibility factors in higher fungi: The effect of structure and symmetry on breeding

“…The two-locus structure confers an additional advantage, that of flexibility, on the inbreeding potential. In S. commune the frequencies of recombination between the two loci of each factor are genetically controlled and can vary, according to the genetic background and the environment, within a range of tenfold or more (Simchen, 1967;Stamberg, 1968;Stamberg and Simchen, 1970). Low recombination is dominant to high (Simchen, 1967;Stamberg, 1969); in addition, the controlling alleles for low recombination in both incompatibility factors are found more frequently in nature than are the alleles for high recombination (Stamberg, 1969).…”