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Medientyp:
E-Artikel
Titel:
Effects of High Temperature on metaphase Pairing in Lilium longiflorum
Beteiligte:
Emsweller, S. L.;
Brierley, Philip
Erschienen:
The University of Chicago Press, 1943
Erschienen in:Botanical Gazette
Sprache:
Englisch
ISSN:
0006-8071
Entstehung:
Anmerkungen:
Beschreibung:
<p>1. Plants of the Creole and Giganteum varieties of Lilium longiflorum with young flower buds were removed from a cool greenhouse (10<sup>⚬</sup>-16<sup>⚬</sup>C.) and exposed for 30 minutes to a temperature of 45<sup>⚬</sup>-46<sup>⚬</sup>C. They were then returned to a greenhouse with temperature of 13<sup>⚬</sup>-19<sup>⚬</sup>C. 2. As a result of this treatment, the frequency of all the irregularities normally found in Creole plants was greatly increased. These included (a) so-called "blown-up" cells, in which all or practically all the chromosomes were broken into numerous fragments; (b) formation of restitution nuclei; and (c) increase in the degree of asynapsis from partial to complete. In Giganteum, partial to complete asynapsis was induced, and in two buds on different plants enucleate pollen mother cells were found as well as others with only a fragment or with bivalents ranging in number from 1 to 15. The treatment evidently affected both the last pre-meiotic mitosis and the early stages of the meiotic cycle.</p>