FGSC #5069

Reporting Genes: Fsp-1;Fsp-2

Species: crassa

Allele: ALS141;DL709

Alternate Strain Number: R120-16-1

Depositor: NBR

Linkage Group: IIR;IR

Mating Type: A

Species Number: 10

Genetic Background: SL

Opposite Mating Type: 5070

ref1: Raju., 1986. Can. J. Genet. Cyt. 28:982--990, https://doi.org/10.1139/g86-136

Genes

Locus	Cultural Requirements	Link Group	Type
Fsp-2	IR. Right of nic-2 (6%) (N.B. Raju, personal communication). (253)In crosses heterozygous for Fsp-2, nearly all asci are four-spored at 16°C and eight-spored at 25°C (253). Crosses homozygous for Fsp-2 make four-spored asci at both temperatures. The cytological basis is similar to that for Fsp-1 (N.B. Raju, personal communication).	IR	B
Fsp-1	IIR. Right of pe (4%) (D.D. Perkins, unpublished data).Some of the asci contain four large ascospores rather than the normal eight. In these asci, ascospores are formed at the four-nucleate stage after meiosis II. Dominant, with variable penetrance depending on genetic background. Ascospores from four-spored asci produce homokaryotic cultures. Rarely, three-spored or two- spored asci are formed, and these include some heterokaryotic ascospores. One postmeiotic mitosis is omitted in the four- and three-spored asci, and two divisions are omitted in the two-spored asci. Vegetative morphology is normal. (856) Used in the study of Sk (Spore killer) (857). The cytological basis of Fsp-1 is distinct from that in N. tetrasperma. For a description of a dominant eight-spored mutant of N. tetraspermasee reference 129.	IIR	B

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