Genetic erosion of Hyrcanian boxwoods
Abstract:
Boxwood (Buxus hyrcana) is the most important and valuable broadleaf and evergreen tree species of Hyrcanian forests. Dieback of Box trees caused by boxwood Blight (Cylindrocladium buxicola) and boxwood moth (Cydalima perspectalis) continues to be reported in the Caspian forest. The impact of trees dieback on the survival of boxwood masses is a subject that needs to be carefully investigated since the reduced number of species causes genetic erosion through influencing genetic diversity and differentiation. The genetic diversity and differentiation of box trees and their progenies were studied along Hyrcanian forests by the Research Institute of Forests and Rangeland using total protein and seed storage protein markers. Results indicated that despite the dieback of large parts of boxwood, different populations showed considerable genetic diversity. Despite the considerable genetic variation of the boxwood populations, the differentiation of trees was different from their offspring. These results can be attributed to the fragmentation of the boxwood habitat. Field surveys shows that the size of the boxwood population is decreased and isolated. In this kind of circumstances, selective seed collection from some populations for conservation and reforestation programs can cause the loss of some genes and alter the genetic structure of future populations. Therefore, the selection of a limited population for seed collection or regeneration can lead to genetic erosion of populations in the future. Therefore, it is recommended that a special attention be paid to the seed collection from local ecotypes by the organizations responsible for the restoration of boxwood habitats.
Language:
Persian
Published:
Pages:
30 to 35
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