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First published online September 9, 2009; 10.1104/pp.109.144386

Plant Physiology 151:1446-1458 (2009)
© 2009 American Society of Plant Biologists

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ENVIRONMENTAL STRESS AND ADAPTATION TO STRESS

Hormone- and Light-Mediated Regulation of Heat-Induced Differential Petiole Growth in Arabidopsis[W],[OA]

Martijn van Zanten, Laurentius A.C.J. Voesenek, Anton J.M. Peeters* and Frank F. Millenaar1

Plant Ecophysiology, Institute of Environmental Biology, Utrecht University, 3584 CH Utrecht, The Netherlands

Plants react quickly and profoundly to changes in their environment. A sudden increase in temperature, for example, induces differential petiole growth-driven upward leaf movement (hyponastic growth) in Arabidopsis (Arabidopsis thaliana). We show that accessions that face the strongest fluctuations in diurnal temperature in their natural habitat are least sensitive for heat-induced hyponastic growth. This indicates that heat-induced hyponastic growth is a trait subject to natural selection. The response is induced with kinetics remarkably similar to ethylene- and low light-induced hyponasty in several accessions. Using pharmacological assays, transcript analysis, and mutant analyses, we demonstrate that ethylene and the photoreceptor protein phytochrome B are negative regulators of heat-induced hyponastic growth and that low light, phytochrome A, auxin, polar auxin transport, and abscisic acid are positive regulators of heat-induced hyponastic growth. Furthermore, auxin, auxin polar transport, phytochrome A, phytochrome B, and cryptochromes are required for a fast induction of heat-induced hyponastic growth.

1 Present address: De Ruiter Seeds, Leeuwenhoekweg 52, 2660 BB Bergschenhoek, The Netherlands.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Anton J.M. Peeters (a.j.m.peeters{at}uu.nl).

[W] The online version of this article contains Web-only data.

[OA] Open Access articles can be viewed online without a subscription.

www.plantphysiol.org/cgi/doi/10.1104/pp.109.144386

* Corresponding author; e-mail a.j.m.peeters{at}uu.nl.

Received July 7, 2009; accepted September 7, 2009; published September 9, 2009.


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