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Abstract:

Electrophoretic variants for 11 isozyme systems were examined by horizontal polyacrilamide gel electrophoresis in natural populations of Larrea ameghinoi and L. nitida (section Larrea). The two taxa presented fixed alternative allelic variants at loci Adh-1, Gdh-1 and Mdh-1. Genetic variability estimates showed no statistically significant differences among populations of section Larrea (H(e): 0.097-0.167). However, these values were significantly lower than those reported for species of section Bifolium (L. divaricata, diploid L. tridentata) in a previous contribution (H(e): 0.17-0.29). Positive and highly significant Wright's fixation indices are in agreement with higher amounts of inbreeding for L. nitida and L. ameghinoi, as suggested on the basis of floral morphology by previous authors. Moreover, the higher levels of genetic differentiation obtained for conspecific populations of section Larrea as compared to those of section Bifolium are also consistent with these observations. Nei's genetic identity values obtained for sympatric (I = 0.80) and allopatric (I = 0.63-0.73) L. ameghinoi - L. nitida population pairs are concordant with those expected for different, but closely related congeneric species.

Registro:

Documento: Artículo
Título:Isozyme variation in Larrea ameghinoi and Larrea nitida (Zygophyllaceae): Genetic diversity and its bearing on their relationship
Autor:Lia, V.; Comas, C.I.; Cortés, M.C.; Hunziker, J.H.
Filiación:Depto. de Ciencias Biológicas, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, Buenos Aires (1428), Argentina
Calle 20 Nro. 520, Balcarce (7620), Argentina
Inst. de Botánica Darwinion, C.C. 22, San Isidro (1642), Argentina
Palabras clave:Genetic diversity; Isozymes; Larrea ameghinoi; Larrea nitida; Taxonomic status; Larrea ameghinoi; Larrea divaricata; Larrea nitida; Larrea tridentata
Año:1999
Volumen:106
Número:3
Página de inicio:197
Página de fin:207
DOI: http://dx.doi.org/10.1023/A:1003973728628
Título revista:Genetica
Título revista abreviado:Genetica
ISSN:00166707
CODEN:GENEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v106_n3_p197_Lia

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Citas:

---------- APA ----------
Lia, V., Comas, C.I., Cortés, M.C. & Hunziker, J.H. (1999) . Isozyme variation in Larrea ameghinoi and Larrea nitida (Zygophyllaceae): Genetic diversity and its bearing on their relationship. Genetica, 106(3), 197-207.
http://dx.doi.org/10.1023/A:1003973728628
---------- CHICAGO ----------
Lia, V., Comas, C.I., Cortés, M.C., Hunziker, J.H. "Isozyme variation in Larrea ameghinoi and Larrea nitida (Zygophyllaceae): Genetic diversity and its bearing on their relationship" . Genetica 106, no. 3 (1999) : 197-207.
http://dx.doi.org/10.1023/A:1003973728628
---------- MLA ----------
Lia, V., Comas, C.I., Cortés, M.C., Hunziker, J.H. "Isozyme variation in Larrea ameghinoi and Larrea nitida (Zygophyllaceae): Genetic diversity and its bearing on their relationship" . Genetica, vol. 106, no. 3, 1999, pp. 197-207.
http://dx.doi.org/10.1023/A:1003973728628
---------- VANCOUVER ----------
Lia, V., Comas, C.I., Cortés, M.C., Hunziker, J.H. Isozyme variation in Larrea ameghinoi and Larrea nitida (Zygophyllaceae): Genetic diversity and its bearing on their relationship. Genetica. 1999;106(3):197-207.
http://dx.doi.org/10.1023/A:1003973728628