2005
González-Rodríguez, Antonio; Arias, Dulce M.; Oyama, Ken
Genetic variation and differentiation of populations within the Quercus affinis - Quercus laurina (Fagaceae) complex analyzed with RAPD markers Artículo de revista
En: Canadian Journal of Botany, vol. 83, iss. 2, pp. 155-162, 2005, ISSN: 00084026.
Resumen | Enlaces | Etiquetas: Hybridization, Population genetics, Quercus, RAPD markers
@article{Gonzalez-Rodriguez2005,
title = {Genetic variation and differentiation of populations within the Quercus affinis - Quercus laurina (Fagaceae) complex analyzed with RAPD markers},
author = {Antonio González-Rodríguez and Dulce M. Arias and Ken Oyama},
doi = {10.1139/B04-162},
issn = {00084026},
year = {2005},
date = {2005-01-01},
journal = {Canadian Journal of Botany},
volume = {83},
issue = {2},
pages = {155-162},
abstract = {The population genetics of two hybridizing Mexican red oaks, Quercus affinis Schweid. and Quercus laurina Humb. & Bonpl., was investigated with 54 randomly amplified polymorphic DNA (RAPD) markers scored in 415 individuals from 16 populations representing the distribution area of the two species and a probable secondary hybrid zone. Genetic relationships among populations, depicted in a unweighted pair group method with arithmetic averaging (UPGMA) dendrogram, were largely incongruent with the morphological classification of populations as Q. affinis-like or Q. laurina-like that was obtained in previous studies. In contrast, the two main population clusters in the UPGMA dendrogram corresponded to the location of populations in two distinct geographical areas: southwestern and northeastern. A Mantel test confirmed a significant association between geographic and genetic distances among populations. Analyses of molecular variance (AMOVA) indicated that most genetic variation is contained within populations (84%), while 10.5% (P < 0.0001) is among populations, and 5.1% (P = 0.007) is between the two morphological groups. Differentiation between the southwestern and northeastern geographical groups (as recognized by the UPGMA), was 7.8% (P < 0.0001). The incongruence between genetic and phenotypic patterns suggests that introgression of neutral markers has been considerable between the two species in the hybrid zone, while morphological differentiation has remained comparatively stable. © 2005 NRC.},
keywords = {Hybridization, Population genetics, Quercus, RAPD markers},
pubstate = {published},
tppubtype = {article}
}
The population genetics of two hybridizing Mexican red oaks, Quercus affinis Schweid. and Quercus laurina Humb. & Bonpl., was investigated with 54 randomly amplified polymorphic DNA (RAPD) markers scored in 415 individuals from 16 populations representing the distribution area of the two species and a probable secondary hybrid zone. Genetic relationships among populations, depicted in a unweighted pair group method with arithmetic averaging (UPGMA) dendrogram, were largely incongruent with the morphological classification of populations as Q. affinis-like or Q. laurina-like that was obtained in previous studies. In contrast, the two main population clusters in the UPGMA dendrogram corresponded to the location of populations in two distinct geographical areas: southwestern and northeastern. A Mantel test confirmed a significant association between geographic and genetic distances among populations. Analyses of molecular variance (AMOVA) indicated that most genetic variation is contained within populations (84%), while 10.5% (P < 0.0001) is among populations, and 5.1% (P = 0.007) is between the two morphological groups. Differentiation between the southwestern and northeastern geographical groups (as recognized by the UPGMA), was 7.8% (P < 0.0001). The incongruence between genetic and phenotypic patterns suggests that introgression of neutral markers has been considerable between the two species in the hybrid zone, while morphological differentiation has remained comparatively stable. © 2005 NRC.
2004
González-Rodríguez, Antonio; Arias, Dulce M.; Valencia, Susana; Oyama, Ken
Morphological and RAPD analysis of hybridization between Quercus affinis and Q. laurina (Fagaceae), two Mexican red oaks Artículo de revista
En: American Journal of Botany, vol. 91, iss. 3, pp. 401-409, 2004, ISSN: 00029122.
Resumen | Enlaces | Etiquetas: Hybrid zones, Hybridization, Quercus affinis, Quercus laurina, RAPD markers
@article{Gonzalez-Rodriguez2004a,
title = {Morphological and RAPD analysis of hybridization between Quercus affinis and Q. laurina (Fagaceae), two Mexican red oaks},
author = {Antonio González-Rodríguez and Dulce M. Arias and Susana Valencia and Ken Oyama},
doi = {10.3732/ajb.91.3.401},
issn = {00029122},
year = {2004},
date = {2004-01-01},
journal = {American Journal of Botany},
volume = {91},
issue = {3},
pages = {401-409},
abstract = {Quercus affinis and Q. laurina are two closely related Mexican red oaks with partially overlapping distributions. Within the area of overlap, there are localities where morphological intergradation occurs. A previous hypothesis explained this pattern as a result of secondary contact between the two species, followed by hybridization and introgression. This possibility was analyzed here by examining foliar and genetic variation in 16 localities situated along a macrogeographic gradient, which included morphologically representative populations of both species and populations from within the area of overlap. Maximum-likelihood hybrid index scores calculated from nine semi-diagnostic RAPD markers indicated a shift in the genetic composition of populations from one species to the other along the macrogeographic gradient, with genetically intermediate populations situated in the area of overlap. Foliar variation followed a partially congruent pattern, but Q. laurina-like morphology predominated in some of the genetically intermediate populations. There were several instances of correlated frequency changeovers of single RAPD markers and morphological characters along the macrogeographic gradient and a few cases of markedly parallel patterns between markers. The results were interpreted as consistent with a hypothesis of secondary contact between the two oak species that has resulted in some differential introgression among markers.},
keywords = {Hybrid zones, Hybridization, Quercus affinis, Quercus laurina, RAPD markers},
pubstate = {published},
tppubtype = {article}
}
Quercus affinis and Q. laurina are two closely related Mexican red oaks with partially overlapping distributions. Within the area of overlap, there are localities where morphological intergradation occurs. A previous hypothesis explained this pattern as a result of secondary contact between the two species, followed by hybridization and introgression. This possibility was analyzed here by examining foliar and genetic variation in 16 localities situated along a macrogeographic gradient, which included morphologically representative populations of both species and populations from within the area of overlap. Maximum-likelihood hybrid index scores calculated from nine semi-diagnostic RAPD markers indicated a shift in the genetic composition of populations from one species to the other along the macrogeographic gradient, with genetically intermediate populations situated in the area of overlap. Foliar variation followed a partially congruent pattern, but Q. laurina-like morphology predominated in some of the genetically intermediate populations. There were several instances of correlated frequency changeovers of single RAPD markers and morphological characters along the macrogeographic gradient and a few cases of markedly parallel patterns between markers. The results were interpreted as consistent with a hypothesis of secondary contact between the two oak species that has resulted in some differential introgression among markers.