Emergence of parent characteristics in the seedlings of utsukushimatsu (<i>Pinus densiflora f. umbraculifera</i>)

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  • ウツクシマツの実生苗における形質の発現
  • ウツクシマツ ノ ミショウ ナエ ニ オケル ケイシツ ノ ハツゲン

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Abstract

Utsukushimatsu is one form of Japanese red pine (Pinus densiflora S. and Z.) growing only at Kosei-cho, Shiga Prefecture. The main characteristic distinguish-ing it from typical Japanese red pine is the occurrence of many stems of diameters similar to each other. Seedlings grown from seeds of native utsukushimatsu have many branches until 7-year-old. Twelve-year-old trees are classified into two types, the “many-stem” type and the “few-stem” type. The average number of stems of the former has been 12.6 and the later 2.0. The “many-stem” type also has characteristics similar to native utsukushimatsu other than the number of stems, such as the change of needle color in the winter season, the short length of needles, and the abnormal location of the female flowers. The proportion of the number of the “many-stem” type of the total trees fluctuated from 19% to 82% depending on the mother trees. These facts suggested that the characteris-tics of utsukushimatsu are inherited recessively.

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