FGSC #1203

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Reporting Genes: al-1;pe

Species: crassa

Allele: 34508;Y8743m

Alternate Strain Number: 9128

Depositor: DDP

Linkage Group: IR;IIR

Mating Type: A

Species Number: 10

Opposite Mating Type: 1204

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
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
al-1	IR. Right of hom (<1%), arg-6 (<1 to 4%), T(T54M94), and al-2. Left of lys-3 (9%). (797, 808; D.D. Perkins, unpublished data). (482) Carotenoids abnormal. Strains carrying the various alleles differ widely in phenotype, ranging from white (e.g., 4637) and "aurescent" (pigment in peripheral conidia and conidiophores, 34508) to yellow mycelia and conidia (e.g., ALS4 and RES-25). See, for example, reference 1042. Strains carrying alleles ALS-14, RES-6, 34508, and RES-25 contain large amounts of phytoene (99 to 100% of the total neutral carotenoids), suggesting a lesion that affects phytoene dehydrogenase (398, 1039) (see Fig. 9). Strains carrying allele RWT-ylo accumulate zeta carotene and smaller amounts of neurosporene, suggesting a leaky block of the step between these intermediates (1071). It is not known whether phytoene dehydrogenase catalyzes the whole series of dehydrogenations or whether leakiness of this enzyme accounts for the different mutant phenotypes. For complementation tests, see references 500, 1039, and 1041. Fine-structure mapping (500, 1042). Translocation T(4637), inseparable from al-1, was the first albino mutation and one of the first chromosome rearrangements in Neurospora to be identified and studied (656). Allele 34508 called aur: aurescent.	IR	B