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The effect of drought on transport and metabolism of radioactive abscisic acid (ABA) in roots and shoots of sunflower (Helianthus annuus L. cv. Russian) was observed. Radioactivity from ABA moved freely all over the plants. Young shoot tissues, such as the growing apical bud or axillary buds released from apical dominance, were strong sinks for ABA. Mature tissues were effective exporters. Drought‐induced alterations in the pattern of transport of radioactivity do not appear to be a major factor in the control of drought‐induced changes in ABA levels. Metabolism of ABA occurred in all organs examined in stressed and unstressed plants. Labelled ABA and its metabolites moved in the xylem. Drought altered the quantity of radioactive metabolites and reduced the amount of radioactive ABA in extracts from the stressed plants.
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Hubick et al. (1988) studied this question.
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