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Science 7 July 1989:
Vol. 245. no. 4913, pp. 52 - 54
DOI: 10.1126/science.245.4913.52
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Articles

The Diageotropica Mutant of Tomato Lacks High Specific Activity Auxin Binding Sites

GLENN R. HICKS 1, DAVID L. RAYLE 2, and TERRI L. LOMAX 1

1 Department of Botany and Plant Pathology, and Center for Gene Research and Biotechnology, Oregon State University, Corvallis, OR 97331-2902.
2 Department of Biology and Molecular Biology Institute, San Diego State University, San Diego, CA 92182.

Tomato plants homozygous for the diageotropica (dgt) mutation exhibit morphological and physiological abnormalities which suggest that they are unable to respond to the plant growth hormone auxin (indole-3-acetic acid). The photoaffinity auxin analog [3H]5N3-IAA specifically labels a polypeptide doublet of 40 and 42 kilodaltons in membrane preparations from stems of the parental variety, VFN8, but not from stems of plants containing the dgt mutation. In roots of the mutant plants, however, labeling is indistinguishable from that in VFN8. These data suggest that the two polypeptides are part of a physiologically important auxin receptor system, which is altered in a tissue-specific manner in the mutant.

Submitted on February 15, 1989
Accepted on May 1, 1989


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