The Shade Avoidance Syndrome in Arabidopsis: The Antagonistic Role of Phytochrome A and B Differentiates Vegetation Proximity and Canopy Shade

Martínez-García, Jaime F.; Gallemí, Marçal; Molina-Contreras, María José; Llorente, Briardo; Bevilaqua, Maycon R.; Quail, Peter H.

doi:10.1371/journal.pone.0109275

The Shade Avoidance Syndrome in Arabidopsis: The Antagonistic Role of Phytochrome A and B Differentiates Vegetation Proximity and Canopy Shade

Journal Article · Tue Oct 21 00:00:00 EDT 2014 · PLoS ONE

DOI:https://doi.org/10.1371/journal.pone.0109275· OSTI ID:1904867

Martínez-García, Jaime F. ^[1]; Gallemí, Marçal ^[2]; Molina-Contreras, María José ^[2]; Llorente, Briardo ^[2]; Bevilaqua, Maycon R. ^[3]; Quail, Peter H. ^[4]

Institucio Catalana de Recerca i Estudis Avancats, Barcelona (Spain); Centre for Research in Agricultural Genomics (CRAG), Barcelona (Spain); OSTI
Centre for Research in Agricultural Genomics (CRAG), Barcelona (Spain)
Centre for Research in Agricultural Genomics (CRAG), Barcelona (Spain); Ministry of Education (Brazil)
University of California, Berkeley, CA (United States); US Department of Agriculture (USDA), Albany, CA (United States)

Light limitation caused by dense vegetation is one of the greatest threats to plant survival in natural environments. Plants detect such neighboring vegetation as a reduction in the red to far-red ratio (R:FR) of the incoming light. The low R:FR signal, perceived by phytochromes, initiates a set of responses collectively known as the shade avoidance syndrome, intended to reduce the degree of current or future shade from neighbors by overtopping such competitors or inducing flowering to ensure seed production. At the seedling stage these responses include increased hypocotyl elongation. We have systematically analyzed the Arabidopsis seedling response and the contribution of phyA and phyB to perception of decreased R:FR, at three different levels of photosynthetically active radiation. Our results show that the shade avoidance syndrome, induced by phyB deactivation, is gradually antagonized by phyA, operating through the so-called FR-High Irradiance Response, in response to high FR levels in a range that simulates plant canopy shade. The data indicate that the R:FR signal distinguishes between the presence of proximal, but non-shading, neighbors and direct foliar shade, via a intrafamily photosensory attenuation mechanism that acts to suppress excessive reversion toward skotomorphogenic development under prolonged direct vegetation shade.

View Accepted Manuscript (DOE)

Research Organization:: University of California, Berkeley, CA (United States)

Sponsoring Organization:: Fondo Europeo de Desarrollo Regional (FEDER); National Institutes of Health (NIH); US Department of Agriculture (USDA); USDOE Office of Science (SC)

Grant/Contract Number:: FG03-87ER13742

OSTI ID:: 1904867

Journal Information:: PLoS ONE, Journal Name: PLoS ONE Journal Issue: 10 Vol. 9; ISSN 1932-6203

Publisher:: Public Library of ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
Arabidopsis thaliana
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hypocotyl
leaves
light
seed germination
seedings
visible light

The Shade Avoidance Syndrome in Arabidopsis: The Antagonistic Role of Phytochrome A and B Differentiates Vegetation Proximity and Canopy Shade

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