Hormone- and Light-Mediated Regulation of Heat-Induced Differential Petiole Growth in Arabidopsis

• Published in: Plant physiology (Bethesda) Vol. 151; no. 3; pp. 1446 - 1458
• Main Authors: van Zanten, Martijn, Voesenek, Laurentius A.C.J, Peeters, Anton J.M, Millenaar, Frank F
• Format: Journal Article
• Language: English
• Published: Rockville, MD American Society of Plant Biologists 01.11.2009
• Subjects: abscisic acid; Abscisic Acid - metabolism; Arabidopsis - genetics; Arabidopsis - growth & development; Arabidopsis thaliana; Auxins; Biological and medical sciences; Circles; Cryptochromes - metabolism; Environmental Stress and Adaptation to Stress; ethylene; Fundamental and applied biological sciences. Psychology; Gene Expression Profiling; Gene Expression Regulation, Plant; growth traits; Heat treatment; Hot Temperature; Indoleacetic Acids - metabolism; Kinetics; Light; natural selection; Petioles; photoreceptors; Phytochrome A - metabolism; Phytochrome B - metabolism; Plant cells; Plant growth; Plant growth regulators; Plant Growth Regulators - metabolism; Plant Leaves - growth & development; Plant physiology and development; Plants; proteins; RNA, Plant - genetics; temperature; Temperature control; Arabidopsis thaliana; Hormone; Heat; Plant physiology; Cruciferae; Growth; Dicotyledones; Angiospermae; Spermatophyta; Experimental plant; Petiole
• ISSN: 0032-0889; 1532-2548; 1532-2548
• DOI: 10.1104/pp.109.144386

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.