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• W1966771604 abstract "BAKERSPIGEL, ALEXANDER. (New Mount Sinai Hospital, Toronto, Canada.) The structure and manner of division of the nuclei the vegetative mycelium of Neurospora crassa. Amer. Jour. Bot. 46(3): 180-190. Illus. 1959.-A description has been given of the structure and manner of division of the nuclei the conidia and vegetative mycelium of the *ascomycete, Neurospora crassa. This is another example of fungus which the vegetative nuclei do not appear to divide the manner of classical Instead, as division proceeds, the chromatin forms complexes of chromosomal filaments which then contract. At the end of division the contracted chromatin constricts and pulls rapidly *apart without the aid of visible spindle. Individually recognizable chromosomes were not observed to align themselves on metaphase plate. In the vegetative mycelium of N. crassa the central body elongates and divides by constriction at the midregion. Thus at the end of division each of the sister nuclei is composed -of portion of the original chromatin and central body. It is suggested that both the elongating central body and the densely stained granule the chromatin of nuclei play significant roles during nuclear division. THERE IS wealth of well-documented information on the structure of the and its manner of division the asci of many Ascomycetes (Martens, 1946; Cutter, 1951; Olive, 1953) Among studies have been those by Lindegren and Rumann (1938) and the more recent descriptions by McClintock (1945, 1947) and Singleton (1953) on chromosome behaviour Neurospora crassa. However, examination of reports reveals that very little has been said by writers concerning the nuclei the conidia and vegetative mycelium of this fungus. For example, describing the haploid somatic nuclei N. crassa, Lindegren and Rumann (1938) remarked that the nuclei the mycelia, conidia and perithecial walls are minute densely staining bodies and that they never found spindles except the ascus.2 They Received for publication September 10, 1958. This work is based upon portion of Ph.D. thesis submitted to the Faculty of Graduate Studies, University of Western Ontario, London, Canada. The investigation was supported part by grant from the National Research Council of Canada. 2 Present author's italics. went on to say further that in asexual tissue of many ascomycetes, the nuclei do not appear to be reticulate or vesicular nor is it possible to find, evidence for the view that they divide by mitosis. Not until 1953, when Singleton published his intensive study of the chromosome morphology and cycle N. crassa, was any further reference made to the nuclei the vegetative hyphae of this fungus. In his report, Singleton briefly noted that these very small nuclei general resemble an interphase nucleus and that a tiny heterochromatic region can frequently be made out at one side of the with suggestions of chromosome strands extending from it. No division figures proper were recognized on the few slides made.2 To date, number of reports on the structure and mode of division of the nuclei the vegetative cells of several mucorine and imperfect fungi have been made from this laboratory (Pontefract, 1956; Robinow, 1957a, b and Bakerspigel, 1957; 1958a, b). The following paper records the observations made on the nuclei the vegetative mycelium of the ascomycete, N. crassa. Fig. 1-22.-(HCI Giemsa).-Fig. 1. A dividing cell of conidiophore.-Fig. 2a. A fixed while migrating into basal conidium. b. A conidiophore at the end of division.-Fig. 3. A binucleate conidium. Arrow points to the densely stained granule.-Fig. 4. A gerrrminating conidium. The at the top is dividing.Fig. 5. A germinating conidium. Arrow points to the 2 granules this dividing nucleus.-Fig. 6. A fixed while migrating through hyphal cell. Note the granule at the tip of the elongated tail of chromatin.-Fig. 7. A at beginning of division. Note the granularity of the chromatin at this stage.-Fig. 8. A dividing showing the contracted and densely stained chromatin.-Fig. 9a. An interdivisional showing the granularity of the chromatin as well as the single densely stained granule. b. A during early division. The granular chromatin has begun to contract.-Fig. 10, 11. Division continuing. The chromatin of nuclei, now completely withdrawn from their central bodies, is becoming filamentous.-Fig. 12-14. At this stage of division the dividing chromatin is composed of complexes of chromosomal filaments. Arrows fig. 14 point to the 2 densely-stained granules this chromosomal complex. Compare with granules shown fig. 18.-Fig. 15, 16. Chromosomal complexes which have contracted and are beginning to extend around their central bodies.-Fig. 17-19. Further elongation of the contracted chromatin.-Fig. 20. Division continuing. An elongated, granular bar of chromatin shown constricted at the midregion.-Fig. 21. The extremities of constricted bar of chromatin just after they had separated. The central body has begun to elongate.Fig. 22. Further elongation of central bodies. The separated portions of chromatin are shown being pushed farther apart. Arrow points to the two granules situated on strand connecting the two portions of chromatin." @default.
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• W1966771604 date "1959-03-01" @default.
• W1966771604 modified "2023-09-24" @default.
• W1966771604 title "THE STRUCTURE AND MANNER OF DIVISION OF THE NUCLEI IN THE VEGETATIVE MYCELIUM OF NEUROSPORA CRASSA" @default.
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• W1966771604 doi "https://doi.org/10.1002/j.1537-2197.1959.tb07001.x" @default.
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