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Science 6 January 1989:
Vol. 243. no. 4887, pp. 91 - 93
DOI: 10.1126/science.11540631
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Articles

Science, Vol 243, Issue 4887, 91-93
Copyright © 1989 by American Association for the Advancement of Science

articles

Rapid redistribution of auxin-regulated RNAs during gravitropism

BA McClure and T Guilfoyle

Department of Biochemistry, University of Missouri-Columbia 65211, USA.

Gravitropism, the bending of plants in response to gravity, is caused by differential growth rates on two sides of a responding organ. The general belief, although somewhat controversial, is that auxins play a major role in gravitropism by controlling the rate of cell extension. The tissue print technique was used to ascertain the distribution of auxin-regulated RNAs during the gravitropic response of soybean hypocotyls. In vertically oriented seedlings, auxin-regulated RNAs are symmetrically distributed in the elongating region of the hypocotyl. In horizontally orientated seedlings the distribution becomes asymmetrical within 20 minutes and the greatest asymmetry coincides with the onset of rapid bending. The results provide a clear correlation between the dynamic expression of genes under auxin control and a morphogenetic phenomenon traditionally known as an auxin response.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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The SAR1 gene of Arabidopsis acts downstream of the AXR1 gene in auxin response.
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Mutants of Arabidopsis defective in a sequence-specific mRNA degradation pathway.
M. A. Johnson, M. A. Perez-Amador, P. Lidder, and P. J. Green (2000)
PNAS 97, 13991-13996
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