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Cytology of recessive sexual-phase mutants from wild strains of Neurospora crassa

, : Cytology of recessive sexual-phase mutants from wild strains of Neurospora crassa. Genome. 35(5): 815-826

Wild-collected strains of Neurospora crassa harbor recessive mutations that are expressed in the sexual phase when homozygous. Thirty-two representative mutants that produced barren perithecia were examined cytologically. Six of these mutants failed to form asci. Of the remaining 26, chromosome pairing was disturbed in 12 and meiosis was disturbed at pachytene or diplotene in 5. Seven mutants showed normal meiosis I but then diverged from the normal sequence, and two showed perithecial beak abnormalities. In many mutants, ascus development and nuclear divisions continued after the initial defect, albeit abnormally. Nuclear divisions were often delayed, essentially uncoupling them from other ascus events such as the formation of enlarged spindle pole body plaques, ascospore wall membranes, and spore delimitation. All 32 mutants were recessive and none showed obvious morphological abnormalities during vegetative growth. This phenotype contrasts sharply with that of numerous laboratory-induced ascus mutants, which are frequently expressed pleiotropically in the vegetative phase and several are dominant in the sexual phase.


PMID: 1427061

DOI: 10.1139/g92-124

Other references

Gomez A.; Eng J.; Unruh H.; Mink S., 1989: Altered left ventricular isovolumic relaxation accompanies stroke volume reduction after one year of pulmonary emphysema in dogs. American Review of Respiratory Disease 139(4 PART 2): A120

Moran M.A.; Rutherford L.T.; Hodson R.E., 1992: Streptomyces in a salt marsh ecosystem abundance and importance for degradation of lignin. Abstracts of the General Meeting of the American Society for Microbiology 92: 304

Alkemade, P.P., 1970: The deep structure of the limbus corneae. Ophthalmologica. Journal International D'ophtalmologie. International Journal of Ophthalmology. Zeitschrift für Augenheilkunde 160(1): 85-95

Rathburn, Carlisle Baxter, 1964: Direct photomicrography of air-borne droplets and its application for particle size determination of insecticidal aerosols in the field. Diss Abstr 25(3): 1801

Smith, M.; Lucia, M.Scott.; Werahera, P.N.;, F.G., 2010: Carcinoid tumor of the verumontanum (colliculus seminalis) of the prostatic urethra with a coexisting prostatic adenocarcinoma: a case report. Urethral carcinoid tumors are very rare tumors with only four cases described in the literature. We present the case of a 61-year-old man with a primary carcinoid tumor of the verumontanum (colliculis seminalis) portion of the prostatic urethra wi...

Hammer, R.E.; Krumlauf, R.; Camper, S.; Brinster, R.L.; Tilghman, S.M., 1986: The regulation of alpha -foetoprotein minigene expression in the germline of mice. Cloned 'minigenes', consisting of the first 3 and last 2 coding blocks of the alpha -foetoprotein gene, were introduced into the X-chromosome in the germ line of mice. The transgene escaped inactivation in extraembryonic visceral endoder...

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Kosmath, I.; Patzner, RA.; Adam, H., 1983: Regression im Ovar von Myxine glutinosa L. (Cyclostomata). 2. Elektronenmikroskopische Untersuchungen an den atretischen Follikeln. In the atretic follicle of the open involutionary type an opening in the wall of the follicle is formed through which granulosa cells and yolk platlets are emitted. Migrating cells of the theca layer invade the follicular lumen and absorb phagocyt...