FLOWER-PROMOTING EFFECT OF GIBBERELLIN IN WINTER WHEAT AND BARLEY

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1. Vernalized and unvernalized seeds of barley were sown in green-house under short day or long day condition. At the second leaf stage, a half of the plants in each plot was sprayed with gibberellin. Plants grown from vernalized seeds headed at about the same time under long day condition, whether they were treated with gibberellin or not. Under short day condition, however, gibberellin promoted heading. With plants grown from the unvernalized seeds, gibberellin promoted heading under long day condition whereas it delayed heading under short day condition. Thus the substitution of gibberellin for long day effect and for vernalization effect was shown. 2. Immature embryos growing on developing ear of wheat and barley were vernalized with low temperature combined with or without gibberellin application. Plants grown from the seeds treated at their early ripening stage with low temperature combined with gibberellin gave earlier heading, associated with the decreased leaf number, than the plants from seeds treated with low temperature alone. This effect of gibberellin lasted for a half-year of seed storage. 3. Gibberellin was applied to germinating seeds under vernalization treatment. Gibberellin promoted flowering in varieties which possess high requirement for chilling vernalization, when the chilling was insufficient to satisfy the high requirement. However, the effect of gibberellin was obscure with varieties possessing relatively low requirement for vernalization.
日本植物生理学会の論文

FLOWER-PROMOTING EFFECT OF GIBBERELLIN IN WINTER WHEAT AND BARLEY

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