Abstract
The final biological effect of auxin depends both on free auxin levels and on auxin perception capacity.RolB transformedBeta vulgaris L. hairy roots provide a system for studying both factors. Highly purified plasma membrane fractions were prepared with aqueous two-phase partitioning. Individual hairy root clones were assessed for the binding activities of plasma membrane-bound auxin binding proteins and for their free intracellular indole-3-acetic acid levels. The presence of a high affinity auxin binding protein with a dissociation constant of 9.07 x 10−7 M was detected in the plasma membrane fractions isolated from non-transformed seedling roots and the six clones ofrolB transformed hairy roots. However, the levels of specific IAA binding considerably varied among different hairy root clones and between transformed and non-transformed roots. The levels of the detectable polypeptide in immunoblotting with an antibody against maize 22-kD auxin binding protein subunit were in good agreement to the levels that were detected in auxin binding assays. Differences in the indole-3-acetic acid levels were found between transformed and non-transformed roots and also between different transformed hairy root clones. A negative correlation was observed between free intracellular IAA levels and its specific binding to the plasma membrane-bound auxin binding proteins. A latency study indicated that the binding site for auxin may be located on the exterior face of the plasma membrane
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Abbreviations
- ABP:
-
auxin binding protein
- GS-SIM-MS:
-
gas chromatography-selected ionmonitoring-mass spectroscopy
- IAA:
-
indole-3-acetic acid
- PM:
-
plasma membrane
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Acknowledgments: We would like to thank Dr. R. M. Napier (Horticulture Research International, East Mailing, Kent, UK) for the generous gifts of antibodies.
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Xing, T., Blumwald, E., Zhang, D.Y. et al. Auxin levels and auxin binding protein availability inrolB transformedBeta vulgaris cells. Biol Plant 38, 351–362 (1996). https://doi.org/10.1007/BF02896662
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DOI: https://doi.org/10.1007/BF02896662