Effect of Temperature at the Seedling Stage after Low-Temperature Treatment of Imbibed Seeds on the Growth and Characteristics of <i>Eustoma grandiflorum</i>

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  • Fukushima Keigo
    Hiroshima Prefectural Technology Research Institute, Agricultural Technology Research Center Graduate School of Environmental and Life Science, Okayama University
  • Kajihara Shinji
    Hiroshima Prefectural Technology Research Institute, Agricultural Technology Research Center
  • Ishikura Satoshi
    Hiroshima Prefectural Technology Research Institute, Agricultural Technology Research Center
  • Katsutani Noritoshi
    Hiroshima Prefectural Technology Research Institute, Agricultural Technology Research Center
  • Imamura Hitoshi
    NARO Kyushu Okinawa Agricultural Research Center
  • Goto Tanjuro
    Graduate School of Environmental and Life Science, Okayama University

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Other Title
  • トルコギキョウの生育と切り花形質に及ぼす吸水種子湿潤低温処理後の育苗温度の影響
  • トルコギキョウ ノ セイイク ト キリバナ ケイシツ ニ オヨボス キュウスイ シュシ シツジュン テイオン ショリ ゴ ノ イクビョウ オンド ノ エイキョウ

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Abstract

<p>This study was carried out in order to improve the cut flower production of Eustoma grandiflorum for shipment in late autumn and early spring. In this study, the effect of low-temperature treatment of imbibed seeds for cultivars with different rosette characteristics was investigated. Moreover, the effect of the day and night temperatures after the low-temperature treatment of the imbibed seeds on the growth of flowers was investigated. The experiments were conducted using two cultivars with different rosette characteristics. The bolting rate, flower budding rate, and flowering rate were increased by low-temperature treatment of the imbibed seeds regardless of the rosette characteristics. After low-temperature treatment of the imbibed seeds, seedlings of the two cultivars were raised at different night temperatures (22, 25, 28, and 31°C). With night temperatures of 28 and 31°C, the bolting and flowering rates decreased, regardless of the rosette characteristics, whereas at 22 and 25°C, the bolting rate, flower budding rate, and flowering rate were higher. For night temperatures in the range 22～31°C, the growth and length of the cut were better at lower rather than higher temperatures. Growth at different day temperatures (30 and 40°C) after the low-temperature treatment had no affect on the bolting, flower budding, or flowering rates. However, growth was more favorably promoted with a day temperature of 30°C compared with 40°C.</p>

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