Genetic control of glutamate oxaloacetate transaminase isozymes in the diploid plantStephanomeria exiguaand its allotetraploid derivative
✍ Scribed by L. D. Gottlieb
- Publisher
- Springer
- Year
- 1973
- Tongue
- English
- Weight
- 523 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0006-2928
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✦ Synopsis
The multiple forms of glutamate oxaloacetate transaminase in the annual diploid plant Stephanomeria exigua (Compositae) are controlled by three unlinked gene loci with two, four, and five alleles, respectively. All alleles are codominant, and heterozygotes for any pair of them produce a more darkly staining enzyme with intermediate mobility, suggesting that the enzymes have a dimeric subunit structure. In naturalpopulations, the'same allele ispredominant or fixed at each locus. Stephanomeria elata, the allotetraploid derivative of S. exigua and the closely related S. virgata, produces multiple enzyme variants coded by one pair of its duplieated loci which are identical in eleetrophoretic mobility to those of diploid individuals heterozygous at this locus. The formation of multiple enzyme variants in all individuals of the tetraploid may provide a degree of biochemical versatility that contributes to its ability to colonize disturbed habitats.