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Genetic characterization and relationships of populus alba populus tremula and populus x canescens and their clones

Genetic characterization and relationships of populus alba populus tremula and populus x canescens and their clones

Theoretical and Applied Genetics 84(3-4): 291-298

ISSN/ISBN: 0040-5752

Isozyme analysis was conducted on individuals of Populus alba L., P. tremula L., and P. .times. canescens Smith to genetically characterize and differentiate species, hybrids, and individuals, and to determine genetic relationships among them. Thirty gene loci, with 71 alleles, coding for 15 enzymes were observed. Individuals could be identified on the basis of their multilocus genotypes. There were 21 unique multilocus genotypes among 23 P. alba clones. Five P. alba clones from Canada were genetically distinct from each other. Each of the 18 P. tremula and 15 P. x canescens clones had unique multilocus genotypes. Thirteen clones had a unique genotype at a single locus. Percentage of polymorphic loci, average number of alleles per locus, and mean observed heterozygosity were, respectively, 50.1, 1.86, and 0.085 in P. alba, 51.7, 1.66, and 0.096 in P. tremula, and 51.7, 1.86, and 0.157 in P. .times. canescens. Populus alba and P. tremula were genetically distinct from each other and could be distinguished by mutually exclusive alleles at Aco-3, P. tremula-specific gene Mdh-3, and allele frequency differences at 6 loci. Populus .times. canescens had allele contributions of P. alba and P. tremula. However, their allele frequencies were closer to those of P. alba than being truly intermediate. The mean genetic identity was 0.749 between P. alba and P. tremula, 0.987 between P. alba and P. .times. canescens, and 0.817 between P. tremula and P. .times. canescens. Canonical discriminant analysis of multilocus genotypes separated P. alba, P. tremula, and P. .times. canescens into three distinct groups and portrayed similar interspecific relationship as above. Our results suggested that the putative P. .times. canescens individuals consisted of a mixture of F1 hybrids of P. alba and P. tremula and their backcrosses to P. alba.

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