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KMID : 0368419910340040317
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Journal of Plant Biology
1991 Volume.34 No. 4 p.317 ~ p.324
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Sensory Adaptation in Polar Auxin Transport System to Naphtylphthalamic Acid in Corn Coleoptile Segments
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Yoon In-Sun
Bin G. Kang
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Abstract
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Partial recovery in auxin transport capacity from inhibition by N-1-naphthylphthalamic acid (NPA) was observed when corn coleoptile segments were subjected to a prolonged NPA treatment. Kinetic data indicated that the recovery time is a function of the concentration of NPA applied. Desensitization to NPA was also seen in tissue slices where NPA increased net uptake of auxin, indicating that the apparant adaptation in the auxin transport system did not result possibly from auxin accumulated during transport inhibition. Studies on in vitro binding of NPA to membrane vesicles isolated from the coleoptile indicated that preincubation of the tissue with NPA resulted in the reduced binding activity. Scatchard analysis of the data indicated that this was due to decreases in the number of NPA binding sites. The possibility of causal relationship of modified NPA receptors to the sensory adaptation in auxin transport observed in coleoptile segments will be discussed.
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