FGSC #866

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Reporting Genes: os-1 al-2

Species: crassa

Allele: P641 15300

Alternate Strain Number: 089

Depositor: DDP

Linkage Group: IR IR

Mating Type: A

Species Number: 10

ref1: https://www.genetics.org/content/44/6/1185.long ; 1960 mimeo sheet accompaning 1959 Genetics paper

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
al-2	IR. Right of os-5 (<1%) and T(STL76). Left of arg-6(1%) and al-1 (797, 802, 808, 816, 818). Included in duplications from Tp(T54M94), confirming location left of arg-6(808). (482) Carotenoids absent or abnormal, but steroids produced (398). Blocked in microsomal fraction and defective in phytoene synthetase (445), a particulate enzyme (445 and references cited therein) (Fig. 9). Tracer experiments indicate a lesion between prephytoene pyrophosphate and phytoene (572). Alleles include those resulting in white and pale rose-white, e.g., 15300 and Y254MI65 (1042), and purple, e.g., MN58a (154). For complementation, see references 500 and 1041. Fine-structure mapping (500, 1042) needs reevaluation because of new information on the location of the arg-6 marker (797).	IR	B
os-1	IR. Between nic-1 (10 to 29%) and arg-13 (1%) (789, 812, 816). (M.R. Emerson, cited in reference 789) Sensitive to high osmotic pressure. Readily scored by morphology on nonmoist slants or by failure to grow on media with 4% NaCl. Most os-1 alleles result in cultures that form no or few conidia on agar slants. Alleles NM233t and NM204t are heat sensitive (25°C versus 34°C). In media of high osmolarity, os-1 strains form protoplasts (323, 438). os-1 (Bl35) is an essential genotypic component of the wall-less strain slime (321). Protoplasts of strains carrying heatsensitive allele NM233t are stable at 37 C, with a 7.5-h redoubling time, and show good regeneration. The biochemical defect differs from that affected by either polyoxin or sorbose (chitin or glucan syntheses) (970, 971). Cell wall pores are four times larger in an os-1 mutant than in the wild type; os-1 also has a higher exclusion threshold and a 30-fold-higher galactosamine/ glucosamine ratio (1083, 1084). Intralocus complementation (676). Allele Y256M209 called flm-1.	IR	B