FGSC #3646

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Reporting Genes: fs

Species: crassa

Allele: 44-25

Alternate Strain Number: 44-25

Mutagen: UV

Depositor: HBH

Linkage Group: III

Mating Type: A

Species Number: 10

Genetic Background: SL

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
fs	Infertile as the female but fully fertile as the male (fertilizing) parent. No or few functional perithecia are produced. Another symbol, ff(female fertility, q.v.), has been used by other workers for mutants having the same phenotype. Female fertility is also impaired or absent in some mutants that were named for other traits, e.g., cyt-1, cyt-2, erg, fr, glp-3, gul-3, gul- 4, leu-1, R, ro, sk, so, ssu, ty-1, ty-2, var-1. Numerous additional female-sterile mutants have been isolated (91, 253, 491, 530, and references cited therein), but the genes have not been mapped and/or tested for allelism with the mutations listed here. Many of these also affect vegetative morphology or growth rate. Tests on ff mutants, q.v., show that different mutants are blocked at different points in perithecial development (530). Female sterility has no genetic or functional relationship to mating type (530). Crosses homozygous for any fs gene listed can be made, and progeny can be obtained, by using a heterokaryon of marked fs and fs+ strains as the female parent (732; O. M. Mylyk, personal communication); the same is true for most ffgenes (530). The term "sterile" has been used in different ways: for situations in which no protoperithecia are formed, or in which perithecium development is blocked before ascospore formation, or even in which ascospores are produced that are inviable. The term "barren" has been proposed specifically for crosses in which perithecia develop but few or no ascospores are produced (860). See also ff and pp.		B