The effect of temperature on the germination-promoting activities of cytokinin and gibberellin applied to celery seeds (Apium graveolens) |
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Authors: | NORMAN L. BIDDINGTON TUDOR H. THOMAS ANTHONY S. DEARMAN |
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Affiliation: | National Vegetable Research Station, Wellesbourne, Warwick CV35 9EF, United Kingdom |
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Abstract: | Celery seeds (Apium graveolens L. cv. Lathom Blanching) made dormant by high temperature pretreatment (28–40°C) during imbibition in the dark, germinated at 22°C in the light after treatment with benzyladenine (BA). This BA-induced promotion of germination increased with increasing pre-treatment temperature from 32 to 38°C. whether BA was given before or after pretreatment. A mixture of gibberellins A4 and A7 (GA4/7) given before a 4 day high temperature pretreatment at 32°C partially inhibited the germination-promoting activity of GA4/7 given after. It is suggested that gibberellin induces the formation of a thermola-bile product which is necessary for germination, the precursor of which has a limited source. |
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Keywords: | High temperature dormancy celery seeds cytokinin gibberellin |
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