Journal of Experimental Botany, Vol. 53, No. 375, pp. 1825-1828,
August 1, 2002
© 2002 Oxford University Press
Ethylene perception generates gravicompetence in gravi-incompetent leaves of rye seedlings
Received 3 January 2002; Accepted 23 April 2002
Botanisches Institut der Universität Bonn, Abteilung Molekularbiologie, Kirschallee 1, D-53115 Bonn, Germany
1 Fax: +49 228 73 9004. E-mail: edelmann{at}uni-bonn.de
The elongating leaves of young rye seedlings do not show a gravitropic response when placed horizontally. However, after treatment with ethylene, either supplied exogenously via ethephon or by application of its precursor 1-aminocyclopropane-1-carboxylic acid (ACC), gravicompetence is seen. The inhibition of ethylene perception by 1-methylcyclopropene (MCP) prevents gravicompetence. Young rye leaves provide a useful model system in which to identify the components of the gravity sensing or response systems, the presence of which govern gravicompetence.
Key words: Key words: ACC, coleoptiles, ethephon, ethylene, gravicompetence, gravitropism, primary shoots, rye, Secale cereale.
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