Allozyme variation of old Ginkgo biloba memorial trees in western Japan

Tsumura, Y.; Motoike, H.; Ohba, K.

Allozyme variation of old Ginkgo biloba memorial trees in western Japan

1992

Tsumura, Y. | Motoike, H. | Ohba, K.

Allozyme variation of 89 old memorial trees of Ginkgo biloba L. in western Japan were investigated. For 12 loci from 10 enzyme systems, the percentage of polymorphic loci (95% level), the number of alleles per locus, and the observed heterozygosity were 75.0%, 2.5, and 0.234, respectively. The variation of this species is relatively high in comparison with other gymnosperms. Genetic relationships between four regions (Kansai, Shikoku, North Kyushu, and South Kyushu) were investigated by using two multivariate procedures. Based on a principal component analysis, these four regional groups were not separated clearly, except for the Shikoku and South Kyushu groups, which were almost completely separated in opposite peripheral zones of a scatter diagram. The canonical discriminant analysis also almost completely separated the Shikoku and South Kyushu groups. These results indicate that most trees of the Shikoku and South Kyushu groups might be descendants of individuals from the Kansai and North Kyushu groups, respectively, excluding some exceptions.

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