Thermal Time Requirements for the Germination of the Vulnerable Plant Species <i>Pulsatilla cernua</i> (Thunb.) Sprengel

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  • Sakanoue Seiichi
    Miyota Research Station, Institute of Livestock and Grassland Science, NARO Present address: Hokkaido Agricultural Research Center, NARO
  • Shimoda Katsuhisa
    Miyota Research Station, Institute of Livestock and Grassland Science, NARO Present address: Nasu Research Station, Institute of Livestock and Grassland Science, NARO

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Other Title
  • 絶滅危惧植物オキナグサ（<i>Pulsatilla cernua</i> (Thunb.) Sprengel）の発芽に要する積算温度
  • 絶滅危惧植物オキナグサ(Pulsatilla cernua (Thunb.) Sprengel)の発芽に要する積算温度
  • ゼツメツ キグ ショクブツ オキナグサ(Pulsatilla cernua (Thunb.) Sprengel)ノ ハツガ ニ ヨウスル セキサン オンド

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<p>To obtain one of the physioecological characteristics of the vulnerable plant species Pulsatilla cernua, we determined the base temperature and thermal constant of the germination of this species. We examined the germination time courses at five constant temperatures (10, 15, 20, 25, and 30°C) and used them for the nonlinear fitting of an exponential distribution with a lag phase. The distribution showed excellent goodness of fit to the observed germination time course at any temperature. We linearly regressed germination rate, which is a reciprocal of the duration for 50% germination of P. cernua seeds, against temperature to calculate the base temperature and thermal constant of seed germination. The linear regression showed excellent goodness of fit. The calculated values were 6.57°Cfor the base temperature and 142 degree days for the thermal constant. Using the base temperature, the thermal constant, and the daily air temperatures at the study site, we can predict that the seedling emergence of P. cernua will occur in the summer season.</p>

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