Variation in Nuclear DNA Content in Natural Populations of Orchardgrass (Dactylis glomerata L.) in the Eastern Part of Hokkaido, Japan

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  • オーチャードグラス北海道東部自然集団における核DNA量の変異

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Abstract

It has been reported that nuclear DNA content shows close correlations with geographical distribution in natural populations of orchardgrass (Dactylis glomerata L.) in central Europe (REEVES et al., 1998). D. glomerata has established dominant natural populations in disturbed habitats in the northern part of Japan, but the population abundance is less in the eastern part of Hokkaido, the northernmost island of Japan, because of winter injury. In this study, we examined the variation in nuclear DNA contents in natural populations of D. glomerata along the abundance gradient in the eastern part of Hokkaido. Relative abundances of natural populations were recorded at 16 sites, and their nuclear DNA contents were measured using a flow cytometer. A significant difference was found between nuclear DNA contents in the populations (p<0.001), and nuclear DNA content showed a positive correlation with relative abundance (r = 0.610) and with lowest temperature before snow cover (r = 0.504) at the sites. The results of this study suggest the association between variation in nuclear DNA content and ecological conditions at growing sites

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