Premium
Differential petiole growth in Arabidopsis thaliana : photocontrol and hormonal regulation
Author(s) -
Millenaar Frank F.,
Van Zanten Martijn,
Cox Marjolein C. H.,
Pierik Ronald,
Voesenek Laurentius A. C. J.,
Peeters Anton J. M.
Publication year - 2009
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2009.02921.x
Subject(s) - auxin , arabidopsis thaliana , petiole (insect anatomy) , arabidopsis , phytochrome , light intensity , cryptochrome , biology , shade avoidance , biophysics , plant hormone , phototropism , microbiology and biotechnology , mutant , botany , blue light , biochemistry , red light , gene , materials science , optics , hymenoptera , physics , circadian clock , optoelectronics
Summary• Environmental challenges such as low light intensity induce differential growth‐driven upward leaf movement (hyponastic growth) in Arabidopsis thaliana . However, little is known about the physiological regulation of this response. Here, we studied how low light intensity is perceived and translated into a differential growth response in Arabidopsis. • We used mutants defective in light, ethylene and auxin signaling, and in polar auxin transport, as well as chemical inhibitors, to analyze the mechanisms of low light intensity‐induced differential growth. • Our data indicate that photosynthesis‐derived signals and blue light wavelengths affect petiole movements and that rapid induction of hyponasty by low light intensity involves functional cryptochromes 1 and 2, phytochrome‐A and phytochrome‐B photoreceptor proteins. The response is independent of ethylene signaling. Auxin and polar auxin transport, by contrast, play a role in low light intensity‐induced differential petiole growth. • We conclude that low light intensity‐induced differential petiole growth requires blue light, auxin signaling and polar auxin transport and is, at least in part, genetically separate from well‐characterized ethylene‐induced differential growth.