Summary
Abscisic acid (ABA) increased considerably in stem apices attached to Ricinus plants during a moisture stress but only slightly in stem apices which were detached and then allowed to lose water. A very marked rise in ABA also occurred in phloem-sap of moisture-stressed Ricinus plants. These results suggest that in apices of moisture-stressed plants the increased ABA does not arise in situ but is translocated to the apex after synthesis in the mature leaves.
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Hoad, G.V. Effect of moisture stress on abscisic acid levels in Ricinus communis L. with particular reference to phloem exudate. Planta 113, 367–372 (1973). https://doi.org/10.1007/BF00387319
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DOI: https://doi.org/10.1007/BF00387319