Optimal Treatment of Dormancy Induction for Rooted Cuttings of Clean Larch, an F<sub>1</sub> Hybrid between <i>Larix gmelinii</i> var. <i>japonica</i> and <i>Larix kaempferi</i>

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  • グイマツ×カラマツF<sub>1</sub>雑種「クリーンラーチ」挿し木苗の最適な休眠導入条件

Abstract

<p>The Clean Larch, an F1 hybrid of Larix gmelinii var. japonica and L. kaempferi, is propagated by rooted cutting, and has features such as high carbon assimilation, rapid initial growth, resistance to vole gnawing, and high wood strength. However, the amount of nursery stock does not meet the demand due to the limitation of the period for cutting and difficulty in maintaining the environmental control in greenhouses. Therefore, we are developing a method for year-round rooted cutting production in a closed system. To examine the optimal condition of dormancy induction by artificial means for rooted cuttings obtained in September, we conducted experiments lowering the temperatures from 23℃ to 10℃, 5℃ over an 8-h day length, and －5℃ in dark conditions. For the terminal bud formation, a 23℃- treatment with a short day was required. Lack of 23℃-temperature and short-day treatment or 10℃ and short-day treatment for a week after the high-temperature treatment resulted in dormancy induction death and growth delay after dormancy release in rooted cuttings. The short-day treatment of 23℃ for 3 weeks followed by 10℃ for 4 weeks, 5℃ for 2 weeks, and －5℃ chilling in the dark condition for 4 weeks enabled dormancy release and satisfactory survival and growth performance of Clean Larch cuttings.</p>

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