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The Systematics of Autopolyploidy in Epilobium latifolium (Onagraceae)
Vol. 20, No. 2 (Apr. - Jun., 1968), pp. 169-181
Stable URL: http://www.jstor.org/stable/2805620
Page Count: 13
You can always find the topics here!Topics: Pollen, Tetraploidy, Diploidy, Chromosomes, Polyploidy, Plants, Biological taxonomies, Autopolyploidy, Chromosome morphology, Ploidies
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Diploid (2n = 36) plants of Epilobium latifolium L. have been found in Alaska and the western Cordillera of North America, and tetraploids in Iceland, western Greenland, and southeastern Quebec. Study of the morphology of these chromosome races revealed a character, the number of pores in the pollen grains, by which they could be distinguished with an average probability of 75%. Tetraploids of E. latifolium tend to have high percentages of 4-pored pollen, while the diploids usually have only 3-pored pollen. On this basis, the ranges of the races were extrapolated from herbarium material. Detailed comparisons of eight other features of the presumptive diploids and tetraploids showed no significant difference between them. The races appear to form worldwide, allopatric, ecogeographic phases. A high level (57.4%) of quadrivalent formation observed during tetraploid meiosis, and other considerations, indicate that the tetraploids arose by autopolyploidy. The recommendation is made that the races not be given formal taxonomic recognition.
Brittonia © 1968 New York Botanical Garden Press