Assessing the Utility of Isozyme Number for Determining Ploidal Level

In order to evaluate the utility of isozyme number for estimating ploidal level in ancient polyploid (paleopolyploid) plant species, isozyme number was determined for species of the putatively paleopolyploid genus Helianthus with n = 17, and compared with those of a species of Heliomeris with n = 8. Electrophoretic examination of 13 enzymes revealed the presence of nine duplicated isozymes in Helianthus annuus and Helianthus bolanderi and six duplicated isozymes in Heliomeris multiflora. Thus, there is little difference in isozyme number between ploidal levels. It is suggested that the lack of strong concordance between isozyme number and ploidal level may be due to gene silencing in Helianthus and the presence of gene duplications not resulting from polyploidy in both taxa

Morphological Stasis abd Molecular Divergence in the Intercontinental Disjunct Genus Datisca (Datiscaceae)

The genus Datisca comprises two species and has an intercontinentally disjunct distribution: D. cannabina is native to southwest and central Asia, whereas D. glomerata is distributed from northern California to northern Baja California. In 1975, Axelrod proposed a geohistorical scenario to account for such Madrean-Tethyan links, suggesting that these disjunctions resulted from migration across the mid-Atlantic from the Paleogene up to the Neogene, approximately 23 to 65 m.y.a. The two species are quite similar in most phenotypic traits which have been studied to date. The major difference between the two involves their breeding system: D. cannabina is dioecious while D. glomerata is apparently androdioecious. Despite these similarities, Nei\u27s mean genetic identity between the two species is I = 0.142. This is one of the lowest values yet reported for congeneric flowering plants and provides evidence for an ancient origin of the disjunction. Furthermore, the fact that the western populations of D. cannabina have a much higher genetic identity value with D. glomerata than does the eastern population supports the idea that dispersal occurred across the Atlantic. In addition, the population genetic structure of D. glomerata is consistent with an androdioecious breeding system

Some perspective on Molecular Ecology perspectives: Are women being left out?

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/149698/1/mec15063_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/149698/2/mec15063.pd

A Molecular Reexamination Of Introgression Between Helianthus Annuus And H. Bolanderi (Compositae)

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/137464/1/evo04127.pd

Durchflußcytometrische Analytik : ein Weg zur Optimierung biotechnologischer Prozesse

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Some perspective on Molecular Ecology perspectives: Are women being left out?

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/149698/1/mec15063_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/149698/2/mec15063.pd