TABLE 1

Origin and phenotypic properties of the pex2 suppressors

OriginPhenotypic properties of the pex2+ suo strains
Revertantsapex2-1pex2-3AscosporesbGrowth on OAcSexual defect
Intragenic suppressors110
Extragenic suppressors2142
suo11816Green+++dNo
suo236Green++No
suo301Green (NA)e++No
suo4014Green+++Yes
(suo4-30)1Black+++Yesf
(suo4-32)1Black+++No
suo501Black++No
suo602Black+++No
  • a Genetic analysis has shown that the extragenic suppressors lie in six loci (suo1 to suo6).

  • b In addition to impaired pigmentation, green ascospores show defects in germination efficiency.

  • c OA, medium containing oleic acid (0.05%) as sole carbon source; +++, wild type; ++, slow growth (see Figure 1).

  • d The mutant strains exhibit a flimsy aspect on OA medium (see Figure 1).

  • e NA, nonautonomous: suo3 ascospores are green when issued from a mutant × mutant cross while they are black when issued from a mutant × wild-type cross.

  • f The suo4-30 mutant exhibits a slight defect: Homozygous mutant perithecia expel ascospores later than wild-type perithecia.