ワサビ稚苗の生育に及ぼす気温の影響

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  • 奥岡 佳純
    静岡県立大学食品栄養科学部
  • 貫井 秀樹
    静岡県農林技術研究所次世代栽培システム科
  • 久松 奨
    静岡県立大学食品栄養科学部 静岡県農林技術研究所伊豆農業研究センターわさび生産技術科
  • 馬場 富二夫
    静岡県農林技術研究所伊豆農業研究センターわさび生産技術科
  • 片井 祐介
    静岡県農林技術研究所伊豆農業研究センターわさび生産技術科
  • 大石 直記
    静岡県農林技術研究所次世代栽培システム科
  • 谷 晃
    静岡県立大学食品栄養科学部

書誌事項

タイトル別名
  • Effect of air temperature on the growth of wasabi seedlings
  • ワサビチナエ ノ セイイク ニ オヨボス キオン ノ エイキョウ

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<p>To clarify optimum temperature range for the growth of Wasabi (Eutrema japonicum (Miq.) Koidz.) seedlings, the seedlings of a cultivar Izuma and a selected strain Shizuoka A were grown in various temperature conditions. In experiment 1, daytime /nighttime temperatures were kept 15°C/15°C, 20°C/15°C, 25°C/20°C, 30°C/25°C and 30°C/20°C. Fresh and dry weights of Izuma were highest at 20°C/15°C and significantly lower at higher temperature treatments (25°C/20°C, 30°C/25°C and 30°C/20°C). Chlorophyll content of the identical leaves at 25°C/20°C, 30°C/25°C and 30°C/20°C decreased with days after the start of the experiment. Fresh and dry weights of Shizuoka A were highest at 15°C/15°C and significantly lower at higher temperature treatments (25°C/20°C, 30°C/25°C and 30°C/20°C). Chlorophyll content of the identical leaves at 30°C/25°C decreased with days. In experiment 2, nighttime temperature was kept 15°C and daytime temperature was set 15°C, 20°C, 25°C and 30°C. No significant differences in fresh and dry weights of Izuma were observed between 15/15, 20/15 and 25/15, and they were significantly higher than those at 30/15. This is also the case of Shizuoka A. Chlorophyll content of the identical leaves was kept almost constant during the experiment, suggesting that low nighttime temperature can inhibit chlorophyll degradation. By combining the two experimental results, the optimum temperature range for Izuma was determined to be 15°C nighttime temperature coupled with 15–30°C daytime temperature. The optimum temperature range for Shizuoka A was determined to include 25°C daytime and 20°C nighttime temperature, in addition to the above temperature range. The difference in the optimum temperature range between the two strains may be due to the difference of high temperature tolerance.</p>

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