Three hundred and seventy mutants of the ascomycete Ascobolus immersus stock 28 were isolated. They were assigned to at least 75 loci. Mutations in 33 loci affect ascospore morphology: 19 of these loci affect pigmentation, 5 affect pigment distribution and 9 affect shape. The reliability of various phenotypes and the role of multigenic control on ascospore morphogenesis are discussed. Other mutations affect the mycelial growth rate or morphology and sporulation. A total of 56 loci have been mapped in 13 linkage groups corresponding to at least nine chromosomes. Using an intermediary strain, successful crosses between two intersterile stocks of Ascobolus (28 and 50) demonstrated that 12 pairs of mutants isolated in each stock correspond to 12 homologous loci.
ChevaugeonJ.1959; La zonation du thalle, phénomène périodique autonome chez l’Ascobolus immersus. Compte rendu hebdomadaire des séances de l’Académie des Sciences 248:1381–1384
DecarisB., FrancouF., LefortC., RizetG.1978; Unstable ascospore color mutant of Ascobolus immersus. I. Temporal occurrence and modalities of back-mutations. Molecular and General Genetics 162:69–81
GirardJ., RossignolJ.-L.1974; The suppression of gene conversion and intragenic crossing- over in Ascobolus immersus: evidence for modifiers acting in the heterozygous state. Genetics 76:222–243
LeblonG.1972; Mechanism of gene conversion in Ascobolus immersus. I. Existence of a correlation between the origin of mutants induced by different mutagens and their conversion spectrum. Molecular and General Genetics 115:36–48
LeblonG.1974Mise en évidence et propriétés d’un mécanisme de correction mutant spécifique a l’origine des conversions chez Ascobolus immersus Thèse Doctorat-ès-Sciences, Université Paris-Sud, Centre d’Orsay, France
LeblonG., PaquetteN.1978; Intragenic suppression at the b2 locus in Ascobolus immersus.I. Identification of three distinct groups of sup-pression. Genetics 90:475–488
Mekki-BerradaA., RossignolJ.-L., PaquetteN.1976; Haute fréquence de réversion d’un mutant spontané chez Ascobolus immersus. Compte rendu hebdomadaire des séances de l’Académie des Sciences 283:971–974
NicolasA.1978Carte génétique et fréquences de conversion dans le génome d’Ascobolus immersus Thése Doctorat, Universite Paris-Sud, Centre d’Orsay, France.
NicolasA.1979; Variation of gene conversion and intragenic recombination frequencies in the genome of. Ascobolus immersus. Molecular and General Genetics 176:129–138
PaquetteN.1973Cartographic preliminaire des mutants morphologiques de la souche S2 d’Ascobolus immersus et mise en évidence d’un nouveau systeme génétique de la recombinaison intragénique avec marqueurs externes chez ce champignon M.Sc. thesis University of Montreal; Canada:
RizetG., RossignolJ.-L., LefortC.1969; Sur la variété et la spécificité des spectres d’anomalies de ségrégations chez Ascobolus. Compte rendu hebdomadaire des séances de l’Academie des Sciences 269:1427–1430
RizetG., LefortC., DecarisB., FrancouF., KouassiA.1979; Unstable ascospore color mutants of Ascobolus immersus. III. Mapping, temporal occurrence and modalities of back-mutations of 34 new unstable mutants. Molecular and General Genetics 175:293–303
RossignolJ.-L., PaquetteN., NicolasA.1979; Aberrant 4:4 asci, disparity in the direction of conversion and frequencies of conversion in Ascobolus immersus. Cold Spring Harbor Symposia on Quantitative Biology 43:1343–1352
StadlerD. R., ToweA. M., RossignolJ. -L.1970; Intragenic recombination of ascospore color mutants in Ascobolus and its relationship to the segregation of outside markers. Genetics 66:429–447