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The Journal of Heredity 1999:90(3)
© 1999 The American Genetic Association 90:429-433

Brief communication. Allozyme polymorphisms discriminate among coast redwood (Sequoia sempervirens) siblings

DL Rogers

Genetic Resources Conservation Program, University of California, 1 Shields Avenue, Davis, CA 95616, USA e-mail: debrogers@ucdavis.edu

The ability to identify genotypes of coast redwood [Sequoia sempervirens (D. Don) Endl.] using allozyme polymorphisms was tested using pedigreed germplasm. In this, the first study of genotypic identification in this species, 10 allozyme loci were found to be more than sufficient to discriminate among closely related (selfed-sib) individuals within four pedigreed families. Commonly, selfed-sibs within each family differed at four or five loci. Thus the occurrence of type II errors (i.e., erroneously assigning nonidentical sibs to the same clone) was found to be zero. The probability of type I errors is discussed and assumed to be small. Some traits of coast redwood, such as its hexaploid condition and (supposedly) largely outcrossing breeding system, further suggest that allozyme polymorphisms may adequately discriminate among clones in natural populations. With further improvement in technique, such that dosages of various alleles could be discriminated, isozyme analysis could prove even more powerful for clonal identification in this species. Clonal identification is a prerequisite for unbiased studies of genetic structure and mating systems in natural populations of asexually reproducing plant species.


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