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Hormonal Regulation of Seed Development

  • Chapter
Cellular and Molecular Biology of Plant Seed Development

Part of the book series: Advances in Cellular and Molecular Biology of Plants ((CMBP,volume 4))

Abstract

Shortly after pollination, developing cereal grains exhibit significant transient increases in two of the major plant hormones, auxins and cytokinins. A peak in active cytokinins occurs between three to eight days after pollination in all species examined so far. Both zeatin and zeatin riboside concentrations increase by as much as one hundred fold for a period of three days and then decrease equally rapidly. The peak always coincides in time with the peak in endosperm cell division rate, although no causal relationship has been demonstrated between the two events. The enzyme cytokinin oxidase increases shortly after the increase in active cytokinins and is responsible for reducing cytokinins back to basal levels. The cytokinin peak is followed by a peak in free indole-3-acetic acid (approximately 10 to 15 days after pollination) and is associated with the endosperm cell enlargement and endoreduplication phase. The high levels of free IAA are not destroyed but are converted to various conjugates which probably supply the developing seedling with a source of free IAA.

Studies with defective kernel mutants suggest that free IAA levels are causally related to endoreduplication in the endosperm.

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  1. Department of Biochemistry, University of Missouri, Columbia, MO, 65211, USA

    Roy O. Morris

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  1. Department of Plant Sciences, University of Arizona, Tucson, Arizona, USA

    Brian A. Larkins

  2. Laboratory of Plant Cell and Molecular Biology, University of Florida, Gainesville, Florida, USA

    Indra K. Vasil

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© 1997 Springer Science+Business Media Dordrecht

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Morris, R.O. (1997). Hormonal Regulation of Seed Development. In: Larkins, B.A., Vasil, I.K. (eds) Cellular and Molecular Biology of Plant Seed Development. Advances in Cellular and Molecular Biology of Plants, vol 4. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-8909-3_4

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  • DOI: https://doi.org/10.1007/978-94-015-8909-3_4

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