FGSC #5168

Mutant Type

Genus: N

reporting_genes: sn cr-1;arg-5 pe fl;acr-2

species: Neurospora crassa

allele: C136 B123 27947 Y8743m L KH5(r)

stock: M2003

glasgow:

mutagen:

Depositor: EK

Link Group: I IR;IIR IIR IIR;III

MT: a

Species No: 10

gene_back:

oppmt: 0

trans:

ref1:

ref2:

site:

country:

ksudc_link: https://digital.lib.k-state.edu/item/neurospora-crassa/fgsc-5168

ksudc_link_html: https://digital.lib.k-state.edu/item/neurospora-crassa/fgsc-5168 ↗

Genes

Locus	Cultural Requirements	Link Group	Type
fl	IIR. Between ace-1 (5 to 11%) and trp-3 (3%) (816, PB). (613)No macroconidia (609). Highly fertile (612). Used routinely as the female parent in tests for chromosome rearrangements and for mating type (e.g., reference 801). The flsingle mutant produces few microconidia when dry; when wetted, sufficient microconidia are produced to have been used in early irradiation and mutation studies (614, 915); large numbers can be obtained under certain conditions; see reference 893. pe fl (46, 700) and fl;dn (806) double mutants produce abundant microconidia; the latter combination is highly fertile when homozygous. Photograph of microconidial formation (774); see also reference 893. Nuclear numbers in microconidia (46, 64, 478). Wall analysis (207). Immunoelectrophoretic pattern (784). Paradoxical high alcoholic glycolysis on nitrate medium (80). Deficiency of isocitrate lyase on acetate medium; see citations in reference 1088. When fl A and fl a strains are inoculated separately on crossing medium in plates, a double line of perithecia forms where they meet, similar to that accompanying barrage in Podospora (410, 414). fl ascospores from certain fl x fl+ crosses often germinate spontaneously (1127; N. B. Raju, personal communication). Allele C-1835 was called acon (717, 812).	IIR	B
pe	IIR. Between nuc-2 (4%) and arg-12 (1 to 5%) (593, 816). (613) Peach-colored conidia and short hyphae formed, more uniformly than by the wild type, as a lawn close to surface of agar. Distinctive morphology (46, 613). Added arginine increases macroconidiation and tends to obscure scoring of peat 25 C, but not at 39°C. pe single mutants produce both macro- and microconidia. pe fl double mutants produce abundant grey microconidia and no macroconidia (46, 700) (see fl). See col-1, col-4, and references 415 and 416 for interactions with other genes. Called m (microconidial) or pem in some contexts.	IIR	B
sn	I. Right of T(39311) and arg-3 (1 to 6%). Left of T(AR173) and his-2 (<1 to 12%) (174, 808). (687) Spreading colonial growth with good conidiation. Linear growth is less than 1/10 that of the wild type (19). Detectable immediately after ascospore germination by hyphal patterns which suggested the name (688). Abnormal microfilaments (19). Contains actin-like protein (20). Said not to exhibit cytoplasmic streaming (18). Meiosis and ascospore formation are normal in homozygous sn x sn crosses (N.B. Raju, personal communication). Good female fertility. Morphology similar to that of sp, cum, and cot-4mutants (at 25 C) (PB). Used to study development of crystalline inclusions (17). The cr sn double mutant grows as small, discrete, conidiating colonies suitable for velvet replication. The double mutant cr snresembles the rg cr double mutant phenotypically and has the advantage of fertility in homozygous crosses (796); for example of application, see reference 180.	IR	B
arg-5	Uses ornithine, citrulline or arginine.	IIR	B
acr-2	III. Linked to thi-4 (0/286). Left of sc (3 to 6%) and spg (1 to 11%) (498, 816). acr-2 has been shown left of the centromere on published maps but without direct evidence. acr-2and trp-1 (on IIIR) cosegregated at the second division in 1 of 13 asci (H.B. Howe, Jr., personal communication), which would favor a right arm location. Resistant to acriflavine (494, 495); also resistant to 3-amino-1,2,4-triazole (seven alleles tested) (494). Resistance is probably dominant (heterokaryon tests) (498). Not resistant to malachite green. An excellent stable marker, fully fertile, with unambiguous scoring. Sizable inocula should be used to avoid false-negative tests. Use acriflavine at 50 µg /ml in minimal agar medium (816) (higher concentrations may be used) and aminotriazole at 0.5 mg/ml; both added before autoclaving.	III	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