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The specificity of the carrier mediated uptake of abscisic acid by root segments of phaseolus coccineus cultivar prizewinner


The specificity of the carrier mediated uptake of abscisic acid by root segments of phaseolus coccineus cultivar prizewinner



Journal of Experimental Botany 36(166): 807-822



ISSN/ISBN: 0022-0957

Earlier work has established that the saturable component of uptake of RS-[214C]ABA [abscisic acid] by bean (P. coccineus L. cv. Prizewinner) root segments can be attributed to the action of a carrier. The carrier-mediated uptake is unaffected by RS-2-trans-ABA and lunularic acid and the unnatural R-ABA also appears to be ineffective. The specificity for S-ABA requires the halving of the Km value for ABA determined previously (2.6 mmol m-3 for RS-; 1.3 mmol m-3 for S-ABA). The RS-1',4'-cis-diol and RS-1'-deoxy ABA reduce the uptake of RS-[2-14C]ABA about as strongly as does unlabeled ABA, the Ki for 1'-deoxy ABA was similar to the Km for ABA. The Ki for RS-1'-4'-trans-diol was 15.7 mmol m-3. Consideration of the stereochemistry of these compounds suggests that the face of the ring of ABA away from the 1'-hydroxyl group interacts with the carrier site. Labeled material diffused out of undamaged root surfaces which had absorbed RS-[3H]ABA through an apical cut, suggesting that ABA is present in the apoplast. A simplified hypothesis is presented that can account for polar transport of ABA based on a gradient of a carrier in a tissue but where the carrier is distributed uniformly on the apical and basal ends of each cell.

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Accession: 006770037

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Related references

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