Tay, Chong Seng (1979). Evolutionary studies on the cultivated diploid potatoes - Solanum stenotomum Juz. et Buk., S. goniocalyx Juz. et Buk. and S. phureja Juz. et Buk. University of Birmingham. Ph.D.
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Tay1979PhD.pdf
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Abstract
The whole variability of the cultivated diploid potatoes in the International Potato Centre gene bank was studied both morphologically and biochemically to detect any discontinuities existing in the variation pattern. This information, together with the eco-geographical distribution data, was then used to support a taxonomic classification and to postulate an evolutionary scheme for the cultivated diploids.
Over six hundred distinct native cultivars were observed in the field and out of these, 327 were analysed morphologically using 124 characters with the following numerical techniques : principal coordinate analysis, average linkage clustering and 'REGROUP' (a method that forms groups by maximising the within-group similarity). These analyses and other sorting techniques such as MST, single linkage clustering, nearest neighbours list, etc., were tested using known hybrid populations; and it was shown that these numerical techniques were sensitive enough to provide meaningful results in the study of the diploid cultivars.
These findings indicate a slight difference from previous classification of this material, in placing it as one species, S. stenotomum, divided into three distinct morpho—ecogeographical subspecies - subsp. stenotomum, subsp. goniocalyx and subsp. phureja. However, in the present study some definite boundaries within the three taxa could also be distinguished.
A chromatographic study of the leaf phenolic compounds and an electrophoretic study of the soluble tuber proteins qualified the results obtained from the morphological studies.
| Type of Work: | Thesis (Doctorates > Ph.D.) | |||||||||
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| Award Type: | Doctorates > Ph.D. | |||||||||
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| Licence: | All rights reserved | |||||||||
| College/Faculty: | Faculties (to 1997) > Faculty of Science | |||||||||
| School or Department: | Department of Plant Biology | |||||||||
| Funders: | Other | |||||||||
| Other Funders: | International Potato Center | |||||||||
| Subjects: | Q Science > QK Botany | |||||||||
| URI: | http://etheses.bham.ac.uk/id/eprint/13725 |
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