Phytochrome A enhances the promotion of hypocotyl growth caused by reductions in levels of phytochrome B in its far-red-light-absorbing form in light-grown Arabidopsis thaliana

Plant Physiology
Jorge J Casal

Abstract

We sought to determine if phytochrome B (phyB)-mediated responses to the red light (R)/far-red light (FR) ratio are affected by phytochrome A (phyA) activity in light-grown seedlings of Arabidopsis thaliana. Pulses of FR delayed into the dark period were less effective than end-of-day (EOD) FR in promoting hypocotyl growth over a given period in darkness. White light minus blue light interposed instead of darkness between the end of the white-light photoperiod and the FR pulse was sufficient to maintain responsivity to the decrease in phyB in FR-light-absorbing form in wild-type (WT) seedlings, but not in the phyA mutant. Compared with EOD R, hourly R+FR pulses provided throughout the night caused a stronger promotion of stem growth than a single EOD R+FR pulse in WT Arabidopsis, cucumber, mustard, sunflower, tobacco, and tomato, but not in phyA Arabidopsis or in the aurea mutant of tomato. WT seedlings of Arabidopsis responded to a range of high EOD R/FR ratios, whereas the phyA mutant required stronger reductions in the EOD R/FR ratio. In sunlight, phyA seedlings of Arabidopsis showed no response to the "early warning" signals of neighboring vegetation, and hypocotyl-growth promotion occurred at higher plant densities than in...Continue Reading

Citations

Jul 27, 1999·The Plant Journal : for Cell and Molecular Biology·P D CerdánJ J Casal
Aug 6, 2000·The Plant Journal : for Cell and Molecular Biology·M J YanovskyJ J Casal
Jan 1, 1997·Annual Review of Cell and Developmental Biology·C Fankhauser, J Chory
May 15, 2012·The Arabidopsis Book·Jorge J Casal
Nov 14, 2013·Journal of Experimental Botany·J J CasalR Sellaro
Feb 5, 2013·Annual Review of Plant Biology·Jorge J Casal
Jul 10, 2007·Plant, Cell & Environment·Scott A FinlaysonPage W Morgan
Feb 4, 2011·The Plant Journal : for Cell and Molecular Biology·Benjamin ColeJoanne Chory
Jan 29, 2014·Plant Science : an International Journal of Experimental Plant Biology·Anja PossartAndreas Hiltbrunner
Jan 29, 2000·Photochemistry and Photobiology·J J Casal
Sep 19, 2002·The Journal of Biological Chemistry·Sanja RojeAndrew D Hanson
Jun 18, 2005·The Journal of Biological Chemistry·Giuseppe OrsomandoAndrew D Hanson
Apr 2, 2003·The Journal of Biological Chemistry·Eoin P QuinlivanAndrew D Hanson
Apr 4, 2008·The Journal of Biological Chemistry·Aymerick EudesAndrew D Hanson
Oct 25, 2020·The Plant Journal : for Cell and Molecular Biology·Germán MurciaJorge J Casal

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