SPATIAL GENETIC-STRUCTURE WITHIN 2 POPULATIONS OF A SELF-INCOMPATIBLEPERENNIAL, CHIONOGRAPHIS-JAPONICA VAR JAPONICA (LILIACEAE)

Intrapopulational spatial genetic structure was examined in two popula tions of Chionographis japonica var. japonica, a self-incompatible per ennial, by spatial autocorrelation analysis of enzyme polymorphism. Al though most spatial autocorrelation indices (Moran's I) in the shortes t distance class were significantly positive, most in the other distan ce classes did not significantly deviate from the values expected from random distributions of genotypes in both populations. This contrasts with a spatial genetic pattern previously reported for a population o f the predominantly selfing congener, C. japonica var. kurohimensis, i ndicating that pollen-mediated gene flow highly impedes genetic substr ucturing within populations of outcrossing C. japonica var. japonica. Genetic similarity in very proximate distance found in outcrossing C. japonica var. japonica is probably due to restricted dispersal of seed s.