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Plant Physiol. May 1973; 51(5): 894–897.
PMCID: PMC366371

The Metabolism of Hormones during Seed Germination and Release from Dormancy

III. The Effects and Metabolism of Zeatin in Dormant and Nondormant Ash Embryos 1

Abstract

Zeatin and zeatin-9, β-ribonucleoside enhance the germination of dormant ash embryos. While the first macroscopic signs of germination appear only after about 72 hours, 12 hours of exposure to 50 μm zeatin is as effective as continuous incubation. There must be barriers against transport out of the embryos since 8-14C-zeatin and its metabolites, zeatin-9, β-ribonucleoside, the 5′-mono and the suspected di- and triphosphates, accumulate against a concentration gradient. Zeatin ribonucleoside is about as effective as zeatin in enhancing embryo germination, yet the internal 8-14C-zeatin level is lower by a factor of about 50 when the ribonucleoside is fed. The physiological effects of zeatin and abscisic acid on the germination of ash embryos are antagonistic. There is, however, no evidence that abscisic acid has a significant effect on 8-14C-zeatin uptake or conversions.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Brandes H, Kende H. Studies on cytokinin-controlled bud formation in moss protonemata. Plant Physiol. 1968 May;43(5):827–837. [PMC free article] [PubMed]
  • Sondheimer E, Galson EC. Effects of Abscisin II and Other Plant Growth Substances on Germination of Seeds with Stratification Requirements. Plant Physiol. 1966 Oct;41(8):1397–1398. [PMC free article] [PubMed]
  • Sondheimer E, Tzou DS, Galson EC. Abscisic Acid levels and seed dormancy. Plant Physiol. 1968 Sep;43(9):1443–1447. [PMC free article] [PubMed]
  • Sondheimer E, Tzou DS. The Metabolism of Hormones during Seed Germination and Dormancy: II. The Metabolism of 8-C-Zeatin in Bean Axes. Plant Physiol. 1971 Apr;47(4):516–520. [PMC free article] [PubMed]
  • Walton DC, Sondheimer E. Metabolism of 2-C-(+/-)-abscisic Acid in excised bean axes. Plant Physiol. 1972 Mar;49(3):285–289. [PMC free article] [PubMed]

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