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Plant and Cell Physiology, 2000, Vol. 41, No. 10 1164-1170
© 2000 Oxford University Press

Growth Conditions Modulate Root-Wave Phenotypes in Arabidopsis

Charles S. Buer1,2,3, Josette Masle1 and Geoffrey O. Wasteneys2

1 Environmental Biology Group, Research School of Biological Sciences, The Institute of Advanced Studies, The Australian National University, GPO Box 475, Canberra, ACT 2601 Australia 2 Plant Cell Biology Group, Research School of Biological Sciences, The Institute of Advanced Studies, The Australian National University, GPO Box 475, Canberra, ACT 2601 Australia

The cause for the wave-like growth of Arabidopsis thaliana roots on semi-solid medium remains unclear. Researchers have hypothesized a gravity-induced touch-response, circumnutation, or combinations thereof act as the major stimuli. Our data demonstrate that the gaseous environment within the Petri dish can override gravitational effects. Furthermore, we show that medium ion concentrations and gelling polymers modify the wave response. Although the mechanisms driving our wide-ranging wild-type phenotypes are currently unknown, these results are of immediate significance for interpreting genetic and physiological modifications of environmentally and genetically induced characteristics.

3 Corresponding author: E-mail, buer@rsbs.anu.edu.au; Fax, +61-2-6249-4919. (Fax, +61-2-6251-4919 from 1 January 2001)


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