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Abscisic acid in straw residues from autumn‐sown wheat
Author(s) -
Hall Keith C.,
Chapman Stephen J.,
Christian Dudley G.,
Jackson Michael B.
Publication year - 1986
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740370304
Subject(s) - straw , abscisic acid , agronomy , seedling , chemistry , horticulture , biology , biochemistry , gene
Wheat straw collected from the soil surface 9 weeks after the 1983 grain harvest contained the plant hormone abscisic acid (ABA). A 10 cm 3 leachate from 1 g of straw is calculated to have contained sufficient ABA (1.5x10 −4 mol m −3 ) to retard seedling root extension. In contrast, straw incorporated into surface soil shortly after harvest contained no detectable ABA 9 weeks after harvest. The concentration of ABA in the flag leaf increased during the 2 weeks before grain harvest in 1984. In this particularly wet autumn, ABA in surface straw decreased steadily to below the level of detection 7 weeks after grain harvest. Sephadex chromato‐graphed fractions of aqueous extracts of fresh straw judged to contain ABA inhibited root extension of barley seedlings. These findings indicate causes of poor growth of cereal seedlings drilled into seed‐beds with surface straw residues from the preceding crop.