FGSC #8155

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Reporting Genes: T (IR->VIR) NM103 het-5 OR tol trp-4

Species: crassa

Allele: tol-N83, trp-4-Y2198

Alternate Strain Number: 321N6

Depositor: JFL

Linkage Group: IR, VIR, IR, IVR, IVR

Mating Type: a

Species Number: 10

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
tol	IVR. Linked to trp-4 (~1%), probably to the left (755). Suppresses the vegetative (heterokaryon) incompatibility associated with mating type alleles A and a, but does not affect sexual compatibility. (tol;A+ tol;a) heterokaryons are fully compatible and stable if other het loci are homokaryotic, and A/a duplications grow normally when tol is present (755). Recessive (252); see reference 746, however, for a stable mixed-mating type heterokaryon that is (tol a + tol+ slime A). tol does not suppress the vegetative incompatibility of differing alleles at het-c or het-e(755, 803). Mutation or deletion of tol+ restores normal growth rate to slow-growing, unstable, mixed-mating-type (tol a + tol+ A) heterokaryons (252). tol is present in some isolates from nature and has arisen at least twice by mutation in laboratory stocks (755, PB; O.C. Yoder, personal communication). Double-mutant tol trp-4 stocks are convenient because the closely linked trp-4 tags the tol allele, which otherwise requires progeny tests for scoring. Used to maintain stable A + a heterokaryons, allowing the desired component to be used as the parent in a cross (746). Homozygous tolmay partially restore fertility to the mutant fmf-1 (531).	IVR	B
het-5	IR. Between T(NM103) and the tip; hence, right of thi-1 (729).Vegetative incompatibility recognized by inhibited duplications and subsequently confirmed by heterokaryon tests (729, 730).	IR	B
OR			B
T(IR->VIR)NM103	Translocation		B
trp-4	IVR. Between his-5 (3 to 7%) and leu-2 (1 to 2%) (633, 991). (47). Uses tryptophan or indole (750). Deficient in anthranilate phosphoribosyl transferase (1126) (Fig. 11). Scorable by blue fluorescence (anthranilate) in medium under long-wave UV after 2 to 5 days of growth on minimal medium plus indole (10 µg /ml), 34°C. Initial stocks of the first trp-4 mutant were inhibited by suboptimal concentrations of tryptophan (750), but derivatives have been obtained that are free of this problem (909).	IVR	B