高昼温によるネギ中生品種の脱春化誘導

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  • Induction of Devernalization in Mid-season Flowering Cultivars of Japanese Bunching Onion (Allium fistulosum L.) by High Day Temperature.

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To investigate the devernalization of mid-season flowering cultivars of Japanese bunching onion (Allium fistulosum L.), 'Kincho' and 'Asagi-kujo' were grown at 20/7°C and 35/7°C (day/night) for 40 and 60 days. The effect of a high day temperature on subsequent growth, flowerbud formation, and bolting was examined. The plant height of 'Kincho' was smaller at 35/7°C than at 20/7°C, but that of 'Asagi-kujo' was unaffected by day temperatures. In both cultivars, the leaf sheath diameter at 35/7°C was smaller than that at 20/7°C, but more leaves expanded at 35/7°C than at 20/7°C. In both cultivars, 54.3% to 75.0% of plants formed flower buds at 35/7°C, whereas 100% formed flower buds at 20/7°C but furthermore, their development was retarded at the higher temperature. In the 60-day treatment, the retardation of flower-bud formation at 35/7°C was similar to that in the 40-day treatment ; 75% of the seedlings of both cultivars bolted. We conclude that a high temperature treatment (35/7°C) can induce devernalization in the mid-season flowering cultivars 'Kincho' and 'Asagi-kujo'.

収録刊行物

  • 園芸学会雑誌

    園芸学会雑誌 69 (5), 611-613, 2000

    一般社団法人　園芸学会

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