Keywords
DIPLOID PROGENITORS
How to Cite
Abstract
An electrophoretic analysis ofthe western North American alveolate-fruited Chenopodium (subsect. Cellulata) was undertaken to examine the evolutionary relationships among the three diploid species C. neomexicanum, C. palmeri, C. watsonii, and the allotetraploid C. berlandieri. Data suggest that eight and 16 isozyme loci code for the five enzyme systems GOT, IDH, LAP, MDH, and PGI in the diploids and tetraploid, respectively. Results confirm that C. berlandieri is an allotetraploid, originating by
hybridization between at least two different diploid genomes. On the basis ofthe electrophoreticphenotypes, geographical ranges, and past morphological studies, C. neomexicanum and C. watsonii are suggested as ancestors to the tetraploid. Enzyme multiplicity in C. berlandieri may account for the tetraploid's widespread distribution throughout western North America.
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