Abstract
The temperature-dependent, primary dormancy of cv. Florida 683 celery seeds in darkness was partially broken by a 30 min light exposure on the third day of incubation at 20–22°C, resulting in c 50 percent germination after 20 days. This light stimulation was negated by including different inhibitors of gibberellin biosynthesis in the incubation medium. Subsequent addition of a solution of the gibberellins A4 and A7 or of the gibberellin-active compound (1-3-chlorophthalimido)-cyclohexane carboxamide (AC94,377) overcame the inhibitory effects on germination of these GA-biosynthesis inhibitors. It is suggested that light stimulates the biosynthesis of gibberellins which are essential for dormancy-break in celery seeds and that this biosynthesis is either directly or indirectly controlled through phytochrome.
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Abbreviations
- AC94,377:
-
1-(3-chlorophthalimido)-cyclohexane carboxamide; ancymidol, α-cyclopropyl-α-(4-methoxyphenyl)-5-pyrimidinemethanol
- AMO1618:
-
N,N,N-2-tetramethyl-5-(1-methyl ethyl)-4-(1-piperidinylcarbonyl)oxy-benzenaminium chloride
- BTS44584:
-
S-2,5-dimethyl-4-pentamethylenecarbamoyloxyphenyl-SS-dimethyl sulphonium
- P:
-
toluenesulphonate; chlormequat chloride, 2-chloroethyltrimethylammonium chloride; daminozide
- N:
-
dimethylaminoscuccinamic acid; paclobutrazol, (2RS, 3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl pentan-3-ol)
References
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Thomas, T.H. Gibberellin involvement in dormancy-break and germination of seeds of celery (Apium graveolens L.). Plant Growth Regul 8, 255–261 (1989). https://doi.org/10.1007/BF00025395
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DOI: https://doi.org/10.1007/BF00025395