Mitotic periodicity and related cytological observations in two species of intertidal red algae, Rhodomela Larix (Turner) C. Agardh and Porphyra Lanceolata (Setchell and Hus) G.M. Smith

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dc.contributor.authorPringle, John Douglasen_US
dc.date.accessioned2024-08-15T17:18:06Z
dc.date.available2024-08-15T17:18:06Z
dc.date.copyright1968en_US
dc.date.issued1968
dc.degree.departmentDepartment of Biology
dc.degree.levelMaster of Science M.Sc.en
dc.description.abstractAn investigation was initiated in September of 1966 to ascertain to what affect certain environmental conditions have on the diurnal distribution of mitosis in meristematic areas of intertidal red algae. Rhodomela larix, a mid-shore plant, and Porphyra lanceolata, a high shore plant, handled well with the chosen technique and thus were selected as initial plants from a number of possible species. Eight stages of karyokinesis were defined for both species and quantitative data on mitosis were attained. Statistically significant rhythms in karyokinesis were present in both species but the diurnal pattern of the rhythms differed in each species. R. larix plants collected in July maintained a statistically significant, asynchronous rhythm of mitosis throughout a 14 hour period, but those collected in February showed fluctuations over a 24 hour period which were not statistically significant. Nuclei of P. lanceolata plants maintained a phased rhythm of mitosis over 24 hour periods in November and January; karyokinesis was initiated between 1430 and 1630 hours in November and between 1230 and 1430 hours in January but in both monthly collections the maximum peaks in the seven earliest stages of karyokinesis occurred at 1630 hours. From this work it is suggested that light intensity may play a significant role in bringing about a periodicity in mitosis in P. lanceolata. P. lanceolata was maintained under varying laboratory conditions in January in an attempt to discern which, if any, environmental factor(s) triggered karyokinesis. Plants kept submersed under constant light exhibited a statistically significant peak in karyokinesis at 1630 hours. Aspects on the life history and cytology of P. lanceolata were observed and plants collected in November were observed to contain three distinct types of asexual spores. Plants collected in January exhibited different types of spores to the November plants and are thought to be L and B spores. Sexual reproduction including the fertilization process is described and illustrated as is the post-fertilization process.en
dc.format.extent211 pages
dc.identifier.urihttps://hdl.handle.net/1828/19367
dc.rightsAvailable to the World Wide Weben_US
dc.titleMitotic periodicity and related cytological observations in two species of intertidal red algae, Rhodomela Larix (Turner) C. Agardh and Porphyra Lanceolata (Setchell and Hus) G.M. Smithen_US
dc.typeThesisen_US

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