소나무 天然生林의 集團遺傳學的 硏究 Ⅱ. 島嶼地域內 集團間의 遺傳的 分化

Genetic Studies in Natural Populations of Pinus densiflora Ⅱ. Genetic Differentiation in Isoperoxidase of P. densiflora Growth in Islets Isolated by Sea

Twenty populations of Pinus densiflora collected from 11 islets at Seto Inland Sea in Japan were investigated for isoperoxidase variation in the squzeed sap of needle leaves. Twelve bands in all were identified in the starch gel. Twenty populations could be classified genetically identified six consolidated groups by the frequency of occurrence of three bands H, K, and M, which were found variation among twelve bands in all. This results is suggested that genetic differentiation in twenty populations of P. densiflora was brought out not by natural selection but by genetic random drift. We were able to forward a hypothesis in this study that P. densiflora populations which were scattered in the small region isolated by sea were genetically differentiated in respect of the isoperoxidase contents, which were considered to have arisen through the random genetic drift occurring the spreading-period of the species.