Genetic diversity of Malus spontanea (Rosaceae), an endangered tree species that is
restricted to a single population growing in the Kirishima Mountains of Kyushu, Japan,
was analyzed using microsatellites. Analysis of 307 individuals across native and cultivated
populations revealed that the genotypes of 306 individuals were almost identical. Of the entire
native population, only nine individuals differed by a single peak at one marker, and one
individual by only two peaks at two markers. Only one individual from Isa City had different
peaks at multiple markers, and some markers were different at all peaks, so this is thought to
be the result of hybridization. Based on these results, almost all existing native individuals
of Malus spontanea are estimated to be clones. Further research is needed to clarify the
reproductive system within this species and develop a conservation plan to prevent further
loss of genetic diversity.
Research papers (academic journals)
