Action of Abscisic Acid on Auxin Transport and its Relation to Phototropism |
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| Authors: | SHAMSHAD M NAQVI K C ENGVILD |
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| Institution: | Atomic Energy Agricultural Research Centre, Tandojam (Sind), Pakistan and Agricultural Research Department, Danish AEC, RisØ, DK-4000 Roskilde, Denmark |
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| Abstract: | The action of abscisic acid on the kinetics of auxin transport through Zea mays L. (cv. Goudster) coleoptiles has been investigated. Abscisic acid applied simultaneously with indoleacetic acid-2-14C in the donor block reduced the transport intensity without materially affecting the basipetal velocity or the uptake. No effect on acropetal transport was observed. The data have been used to discuss the similarities in effects of abscisic acid and visible radiation and a hypothesis is proposed to explain the phenomena of phototropism. |
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