Estudio de la variabilidad genética a escala molecular y cuantitativa de seis procedencias de caoba (Swietenia macrophylla King.) del área de Centroamérica y México
Mahogany (Swietenia macrophylla) is one of the most valuable timber species in the world. It is originated in Tropical America including Central America, whereby due to its overexploitation during the last 30 years, many of its natural populations have been subsequently lost. The genetic variability at the molecular and quantitative level of 41 families of mahogany from six provenances of Central America and Mexico was studied. For the molecular trial, DNA was isolated from young leaves. The polymorphisms generated through the RAPDs analysis were used for the estimation of the genetic variability. A greater genetic diversity was detected within the provenances than among them. This was corroborated with the indices of Nei and Shannon's. The provenances studied were associated in two basic groups: the families from Panama and those from the rest of Central America and Mexico, suggesting that both groups have different origin or evolution. The results were compared with a previous study of the progenitors to estimate the effect of the forest fragmentation over the progeny, suggesting that in the case of the provenance of Costa Rica and Panama the fragmentation of the forest have affected their genetic diversity. Five quantitative variables were evaluated: plant height, root collar diameter, aerial dry matter, root dry matter, and the ratio aerial dry matter/root dry matter. The quantitative study demonstrated the existence of high genetic variability within and among the provenances. All variables except root length and aerial dry matter/root dry matter showed moderate indices of heredability
| Main Authors: | , , , , , |
|---|---|
| Format: | biblioteca |
| Language: | spa |
| Published: |
Turrialba, Costa Rica
1999
|
| Subjects: | SWIETENIA MACROPHYLLA, VARIACION GENETICA, PROCEDENCIA, FITOMEJORAMIENTO, AMERICA CENTRAL, MEXICO, |
| Online Access: | https://repositorio.catie.ac.cr/handle/11554/2899 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|