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Arabidopsis thaliana Responses to Mechanical
Stimulation Do Not Require ETR1 or EIN21
Keith A. Johnson,
Melissa L. Sistrunk2,
Diana H. Polisensky, and
Janet Braam*
Department of Biochemistry and Cell Biology, MS 140, 6100 Main
Street, Rice University, Houston, Texas 77005-1892
Plants
exposed to repetitive touch or wind are generally shorter and stockier
than sheltered plants. These mechanostimulus-induced developmental
changes are termed thigmomorphogenesis and may confer resistance to
subsequent stresses. An early response of Arabidopsis thaliana to touch or wind is the up-regulation of
TCH (touch) gene expression. The
signal transduction pathway that leads to mechanostimulus responses is
not well defined. A role for ethylene has been proposed based on the
observation that mechanostimulation of plants leads to ethylene
evolution and exogenous ethylene leads to thigmomorphogenetic-like
changes. To determine whether ethylene has a role in plant responses to
mechanostimulation, we assessed the ability of two ethylene-insensitive
mutants, etr1-3 and ein2-1, to undergo
thigmomorphogenesis and TCH gene up-regulation of
expression. The ethylene-insensitive mutants responded to wind
similarly to the wild type, with a delay in flowering, decrease in
inflorescence elongation rate, shorter mature primary inflorescences,
more rosette paraclades, and appropriate TCH gene
expression changes. Also, wild-type and mutant Arabidopsis responded to
vibrational stimulation, with an increase in hypocotyl elongation and
up-regulation of TCH gene expression. We conclude that
the ETR1 and EIN2 protein functions are not required for the
developmental and molecular responses to mechanical stimulation.
1
This work was funded by the National Institutes
of Health (grant no. R9 GM 46346) and the National Aeronautics and
Space Administration (grant no. NSCORT NAGW-5007).
2
Present address: Department of Molecular and
Human Genetics, One Baylor Plaza, Baylor College of Medicine, Houston,
TX 77030.
*
Corresponding author; e-mail braam{at}bioc.rice.edu; fax
1-713-285-5154.
Plant Physiol. (1998) 116: 643-649
Copyright Clearance Center: 0032-0889/98/116/0643/07
© 1998 American Society of Plant Physiologists
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