Effect of Storage Temperature and Its Period on Bud Emergence and Flowering of <i>Leucocoryne</i> Bulbs

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  • Nakatsuka Takashi
    Faculty of Agriculture, Shizuoka University Graduate School of Agriculture, Shizuoka University
  • Ide Miyuri
    Faculty of Agriculture, Shizuoka University
  • Omiya Ryosuke
    Graduate School of Agriculture, Shizuoka University
  • Ohno Hajime
    Faculty of Agriculture, Shizuoka University Graduate School of Agriculture, Shizuoka University

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  • リューココリネにおける球根貯蔵の温度と期間が出芽および開花に及ぼす影響
  • リューココリネ ニ オケル キュウコン チョゾウ ノ オンド ト キカン ガ シュツガ オヨビ カイカ ニ オヨボス エイキョウ

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Abstract

<p>Leucocoryne is a geophyte belonging to the family Amaryllidaceae, and it is native to Chili. When cultivared in Japan, leucocorynes usually bloom in spring, and their bulbs show long-term dormancy during summer (> 6 months). Therefore, leucocryne growers desire to shorten the dormancy duration for early flowering. Here, we studied the relationship between the storage temperature and its period for dormancy break of bulbs, bud emergence, flowering, and flower quality in leucocorynes. When their bulbs were stored at 25–35°C for over 8 weeks, uniform bud emergences was observed in 95–100%. Similarly, days to anthesis from planting were also shortened by 50 days compared with non-storage bulbs. However, a cumulative temperature exceeding at 1,500°C・day during the storage period was not effective to further shorten flowering. These bulb storage treatments led leucocorynes to early flowering without reducing the flower quality. We demonstrated a new leucocoryne cropping type that resulting in blooming from November to December, when bulbs were stored at 30–35°C for 8 weeks and then grown at 15°C.</p>

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