FGSC #7232

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Reporting Genes: R un-18

Species: crassa

Allele: 35408 T54M94

Alternate Strain Number: 1596

Depositor: DDP

Linkage Group: IR IR

Mating Type: A

Species Number: 10

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
un-18	IR. Right of T(NM169d) and R (11%) (808). Unknown function. Heat sensitive (507). No growth at 34°C. Growth at 25 C is substantial but not wild type, and better on complete medium than on minimal medium. Allele T54M94 is called 41 in reference 507.	IR	B
R	IR. Right of T(NM169d) and aro-8 (4%). Left of un-18(11%) (1093). (H.R. Cameron, personal communication) All eight ascospores of heterozygous R/+ asci are round rather than ellipsoid. R is thus nonautonomous in ascospores and dominant in the ascus (690). Ascospores are round even in nonlinear asci (1008; D.D. Perkins, unpublished data). Usually two germination pores are formed, but sometimes one (1008). Photograph (1008). Vegetative morphology abnormal, somewhat resembling that of pe mutants. Initial growth on slants is concentrated around the inoculation point. The vegetative morphology is recessive in heterozygous duplications, as from T(NM103) (1091). Female sterile, with no perithecia, but R x R crosses can be accomplished if R is heterokaryotic in the female parent (A.M. Srb, personal communication). Used in studies of duplication instability (1091) and autonomy of ascospore development (529). Allelic recurrences obtained (1008; A.M. Srb, personal communication). For other genetically determined round ascospores, see reference 59. Called Rsp (1008), but the original symbol R has priority. (rsp has been used for cytoplasmically determined respiration-deficient mutants [890].)	IR	B