VARIATION OF ASPARTATE AMINE TRANSFERASE ISOZYMES IN BULNESIA RETAMA (ZYGOPHYLLACEAE)

The isoenzymatic patterns of aspartate amine transferase (AAT=GOT) have been studied in individuals belonging to five populations of Bulnesia retama (Gillies ex Hook.) Griseb., three of them from La Rioja, one from Mendoza, Argentina, and one from Perú. AAT evidenced dimeric structure in this specie...

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Bibliographic Details
Published in:Darwiniana 1992-01, Vol.31 (1/4), p.35-42
Main Authors: COMAS, CECILIA I., HUNZIKER, JUAN H.
Format: Article
Language:English
Subjects:
Alleles
Amines
Biological taxonomies
Enzymes
Evolutionary genetics
Genetic loci
Genetic variation
Population genetics
Population mean
Seedlings
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Summary:The isoenzymatic patterns of aspartate amine transferase (AAT=GOT) have been studied in individuals belonging to five populations of Bulnesia retama (Gillies ex Hook.) Griseb., three of them from La Rioja, one from Mendoza, Argentina, and one from Perú. AAT evidenced dimeric structure in this species and depending on the stage analized, two or three zones of AAT activity were observed. This would imply that at least three loci are controlling the AAT isozymes. The Argentine populations were polymorphic for thee three loci with a mean expected heterozygosity per locus (H̄) varying from 0.536 (Mendoza) to 0.398 (La Rioja). The Peruvian sample, separated from the Argentine populations by an extensive gap of more than 1600 Km, showed polymorphism in only one locus and its mean expected heterozygosity ([symbol]) was 0.164. This lower variation could be due to strong selection in an extreme environment or more likely a consequence of long distance dispersal by one or very few migrants from Southern latitudes (founder effect). Since there is evidence that B. retama is self-compatible, an entire population could have been originated by a single migrant.
ISSN:0011-6793
1850-1699