FGSC #2622

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Reporting Genes: Mei-2;rg-1 cr-1

Species: crassa

Allele: ALS181;B53 B123

Alternate Strain Number: ALS181 = DAS

Mutagen: UV

Depositor: DAS

Linkage Group: VR;IC IR

Mating Type: a

Species Number: 10

Genetic Background: M

ref1: Smith Genetics 80:125-133 1975, https://www.genetics.org/content/genetics/80/1/125.full.pdf

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
rg-1	IR. Right of T(AR173); hence, of his-2. Left of lys-4 (1 to 7%) (271, 789, 810).Spreading dense colonial growth with poor conidiation (789). Increased hyphal branching; bumpy mycelial surface. Altered phosphoglucomutase (isozyme I). Accumulates glucose-1-phosphate (117). Cell wall composition (132). Normal levels of NADPH (110) and linolenic acid (115). Photograph (112). The double mutant rg cr grows as small discrete conidiating colonies suitable for velvet replication (634). For examples of applications, see references 932 and 1020. Unlike sn cr, which it resembles phenotypically, the double mutant rg cr is not homozygous fertile. Allele R2357 was formerly called er: erupt (see reference 382). Allele S4357 was formerly called col-7 (see reference 675).	IR	B
cr-1	IR. Right of ace-7 (1 to 3%) and nic-2 (4 to 7%). Left of cys-9 (3%) and un-1(5%) (721, 816). Included in duplications from T(4540), which do not include cr-2 or cr-3(PB). (610) Rapid conidiation close to surface of agar. Produces very short conidiophores, bearing conidia in tight clusters (610, 611). Photographs (533, 634). Recessive. Deficient in adenylate cyclase (1066); has little or no endogenous adenosine 3',5'-phosphate (1065, 779). Abnormal morphology partially corrected by exogenous adenosine 3',5'-phosphate (891, 892, 1065, 1066). Guanosine 3',5'-phosphate also stimulates mycelial elongation (892). Cyclic nucteotide levels differ in mycelia and conidia (891, 892). NAD(P) glycohydrolase is overproduced and excreted; this is normalized by adenosine 3',5'-phosphate (533). Induction and localization of p-glucosidase is altered; induction is normalized by adenosine 3',5'-phosphate (906). Inability to use glycerol and certain other carbon sources is also overcome by adenosine 3',5'phosphate (598, 1067). Phosphodiesterase inhibitors do not counteract the morphological effect of cr-1 (892). Increased lactate dehydrogenase activity (92). Used to determine what functions are controlled by adenosine 3',5'-phosphate (779). Used to study adenosine 3',5'-phosphate binding protein (1082). Strains carrying the various alleles vary in growth habit (B123 strains are flat, restricted; allele L strains are spreading, but morphology may vary on different media). Modifier mutations which alter morphology and the ability of cr-1 to use glycerol occur frequently (383, 905). Crosses homozygous for allele B123 exude intact linear asci (634). Double mutants sn cr and cr rg form small conidiating colonies suitable for replica plating with velvet (182, 634, 796, 932, 1020). The triple mutant sn cr;csp-2 can be overlayered (744; photograph 747). The single mutant (B123) can be replicated by using a needle replicator (634). Scorability and viability are good. Excellent as a marker. Carotenoids formed normally. cr-1 ascospores may require longer to mature than cr+ ascospores. Allele CE4-11-67 called con(716, 717).	IR	B
mei-2	VR. Linked near inl (995). Between al-3 (20 and his-6(A.L. Schroeder, personal communication). Meiotic divisions occur, and many ascospor are produced, but many are inviable and white. Crosses heterozygous or homozygous for Mei-2 give extensive nondisjunction of all linkage groups (995). Chromosome pairing much reduced (B.C. Lu, cited in reference 995). Sensitive to methyl methane sulfonate, histidine, and gamma rays (939). Dominant in the original strain (995), but progeny show incomplete penetrance (939).	VR	B