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Changes in water relations and endogenous abscisic acid content of wheat and barley grains and embryos during development
Authors:P. C. MORRIS  P. C. JEWER  D. J. BOWLES
Affiliation:Departments of Pure and Applied Biology and Biochemistry, University of Leeds, Leeds LS2 9JT, U.K.
Abstract:
Abstract. Immature cereal embryo development can be controlled by in vitro culture on media containing ABA, or by media of low osmotic potential. To assess the possible in vivo roles of these factors, endogenous ABA levels and water relations of embryos and grains of wheat ( Triticum aestivum L.) and barley ( Hordeum vulgare L.) were determined during development. ABA concentrations remained consistent with those required to inhibit precocious germination in vitro of early stage embryos but not of more mature embryos. With increasing maturity, a difference in water potential developed between grain and embryo, suggestive of an in vivo role for water status in controlling the development of the embryo.
Keywords:Triticum aestivum L.    wheat    Hordeum vulgare L.    barley    abscisic acid    water potential    embryo development
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