Phytochrome-mediated agravitropism in Arabidopsis hypocotyls requires GIL1 and confers a fitness advantage

The Plant Journal : for Cell and Molecular Biology
Trudie AllenGarry C Whitelam

Abstract

Plants use specialized photoreceptors to detect the amount, quality, periodicity and direction of light and to modulate their growth and development accordingly. These regulatory light signals often interact with other environmental cues. Exposure of etiolated Arabidopsis seedlings to red (R) or far-red (FR) light causes hypocotyls to grow in random orientations with respect to the gravitational vector, thus overcoming the signal from gravity to grow upwards. This light response, mediated by either phytochrome A or phytochrome B, represents a prime example of cross-talk between environmental signalling systems. Here, we report the isolation the mutant gil1 (for gravitropic in the light) in which hypocotyls continue to grow upwards after exposure of seedlings to R or FR light. The gil1 mutant displays no other phenotypic alterations in response to gravity or light. Cloning of GIL1 has identified a novel gene that is necessary for light-dependent randomization of hypocotyl growth orientation. Using gil1, we have demonstrated that phytochrome-mediated randomization of Arabidopsis hypocotyl orientation provides a fitness advantage to seedlings developing in patchy, low-light environments.

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Citations

Jan 12, 2011·Proceedings of the National Academy of Sciences of the United States of America·Keunhwa KimGiltsu Choi
Oct 10, 2009·Journal of Experimental Botany·Keara A Franklin, Peter H Quail
Apr 9, 2008·Plant Physiology·Isabelle SchepensChristian Fankhauser
Jun 15, 2007·Proceedings of the National Academy of Sciences of the United States of America·Jutta RöslerMathias Zeidler
Jul 1, 2009·The Plant Journal : for Cell and Molecular Biology·Sally AdamsGarry C Whitelam
Dec 1, 2007·The Plant Journal : for Cell and Molecular Biology·Séverine LorrainChristian Fankhauser
Jan 18, 2014·Plant, Cell & Environment·Yunus EffendiGünther F E Scherer
Aug 16, 2006·Journal of Experimental Botany·Maria Lia MolasMelanie J Correll
Jul 22, 2020·Proceedings of the National Academy of Sciences of the United States of America·Panyu YangHaodong Chen
Feb 10, 2021·G3 : Genes - Genomes - Genetics·Guillermo FriisJohn A Burt

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