那須山系におけるミヤマナラの更新様式

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  • Regeneration modes of Quercus crispula var. horikawae in Mts. Nasu.
  • ナスサンケイ ニ オケル ミヤマナラ ノ コウシン ヨウシキ

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This study aimed to clarify clonal structure and reproductive modes, layering (asexual) and/or seedling regeneration (sexual), of Quercus crispula var. horikawae using eight nuclear EST-SSR markers; the species has stunt creeping multiple stems and occurs in pseudo-alpine zone of the mountains in the Sea of Japan side. This study was conducted in an isolated stand (alt. 1,570 m) of the species near Ohtoge-pass in Mts. Nasu, northern Tochigi Prefecture. DNA was extracted from leaves of 92 stems that did not have any distinct connection of roots and creeping stems above the ground. The results of DNA analysis indicated that the stand consisted of four genets (clones). Genet A, which had 87 stems (ramets), occupied throughout the study plot. The other clones (B, C and D), which were composed of 1-3 ramets, might be derived from seedling regeneration. In conclusion, reproductive modes in the stand were likely to be dominated by layering regeneration resulted from the creeping of stems rather than seedling regeneration that rarely occurred.

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