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The effect of sucrose on the levels of abscisic acid, indoleacetic acid and zeatin/zeatin riboside in wheat ears growing in liquid culture
Authors:Bruce Lee  Peter Martin  Fritz Bangerth
Affiliation:Dept of Biochemistry, Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, UK;Inst. fur Pflan zenernahrung, Univ. Hohenheim, D-7000 Stuttgart 70, FRG.;Inst. für Obst-, Gemüse- und Weinbau, Univ. Hohenheim, D-7000 Stuttgart 70, FRG.
Abstract:The influence of a varied sucrose supply on grain size and hormonal contents of detached wheat ears ( Triticwn aestivum L. cv. Schirokko) was investigated throughout grain development. In ears led limited amounts, or no sucrose, grain weights in both proximal and distal grain positions of the ear were reduced. Radioimmunoassay for abscisic acid, indoleacetic acid and zeatin/zeatin riboside showed that the changes in the levels of these hormones in grains and bracts were comparable to intact ears when detached ears were well supplied with sucrose. Under conditions of limited sucrose supply, higher abscisic acid levels in the distal and proximal grains of detached ears were found compared to ears supplied with adequate sucrose. Limiting sucrose supply to the ear did not alter the levels of indoleacetic acid or zeatin/zeatin riboside in either the grains or bracts of detached ears.
Keywords:Ear culture    grain weight    hormones    Triticum aestivum    wheat
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