Changes in Endogenous Gibberellin Level in Strawberry Plants Induced by Light Breaks

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  • UEMATSU Yoshio
    Shizuoka Agricultural Experiment Station Shizuoka Tohbu Agricultural Extension Office
  • KATSURA Naoki
    National Institute of Agricultural Sciences

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Other Title
  • イチゴ内生ジベレリンの活性に及ぼす光中断の影響
  • イチゴ内生ジベレリンの活性に及ぼす光中断の影響〔英文〕
  • イチゴナイセイ ジベレリン ノ カッセイ ニ オヨボス ヒカリ チュウダン ノ

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Three-hour light break with a light intensity of 55 lux from 60-watt incandscent lamps increased the leaf growth of strawberry plants grown under natural short days of about 11 hours, and it was especially true when the light break was applied in the middle of the dark period.<br>The major gibberellin(GA)-like substance in the acidic ethyl acetate fraction extracted from strawberry leaves and crown was confirmed to be GA19 or a GA-like substance strikingly similar to GA19, by using thin-layer chromatography and dwarf rice bioassay.<br>The GA19-like substance level in plants treated with light break became higher than that in plants grown under natural short days after 9 days of treatment. But differences in the GA19-like substance level were not so clear among plants treated with light breaks at different times during the dark period. The possibility of GA turnover from the GA19-like substance to other GAs induced by light break was discussed.

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