ヤマハギ（Ｌｅｓｐｅｄｅｚａ　ｂｉｃｏｌｏｒ　ＴＵＲＣＺ．）の発芽率に及ぼす発芽条件と硬実打破処理の影響

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  • Recommended Seed Pretreatment for Increasing Germination Percentage of Hard Seed in Lespedeza bicolor TURCZ.
  • ヤマハギ Lespedeza bicolor Turcz.ノ ハツガリツ ニ

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In order to improve the germination percentage ofLespedeza bicolorTURCZ. in revegetation technique, we conducted some indoor experiments with respect to the germination conditions and pretreatments for breaking hard seed. Light conditions did not affect the germination percentage of pretreated seeds, but incubation temperature influenced it as follows: Constantly high or low temperature was favorable for germination ofL. bicolor, whereas alternating temperature depressed it. As for the pretreatments for breaking hard seed, methods including scratching the seed coat were most effective. Hot-water immersion and forced-air drying were also successful. In an experiment wherein we divided the seeds into four seed coat color classes and soaked them in hot water for various lengths of time (t), germination percentage (Y) was well-described by a diminishing returns curve whose independent variable was t: Differences in the curves' shapes showed that the response to heat is affected by seed coat color. Accounting for the percentage of germination, seed viability, convenience and cost, it was considered that hot-water immersion at 70°C for 2-4 min. would be suitable as a pretreatment for increasing the germination percentage for practical propagation.

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