Dynamics of the Shade-Avoidance Response in Arabidopsis
Andrea Ciolfi,Giovanna Sessa,Massimiliano Sassi,Marco Possenti,Samanta Salvucci,Monica Carabelli,Giorgio Morelli,Ida Ruberti +7 more
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TLDR
It is proposed that one way plants adapt to a low-R/FR environment is by enhancing HY5 function, a master regulator of seedling deetiolation in the wild type and not in phytochrome A mutant upon prolonged low R/FR.Abstract:
Shade-intolerant plants perceive the reduction in the ratio of red light (R) to far-red light (FR) as a warning of competition with neighboring vegetation and display a suite of developmental responses known as shade avoidance. In recent years, major progress has been made in understanding the molecular mechanisms underlying shade avoidance. Despite this, little is known about the dynamics of this response and the cascade of molecular events leading to plant adaptation to a low-R/FR environment. By combining genome-wide expression profiling and computational analyses, we show highly significant overlap between shade avoidance and deetiolation transcript profiles in Arabidopsis (Arabidopsis thaliana). The direction of the response was dissimilar at the early stages of shade avoidance and congruent at the late ones. This latter regulation requires LONG HYPOCOTYL IN FAR RED1/SLENDER IN CANOPY SHADE1 and phytochrome A, which function largely independently to negatively control shade avoidance. Gene network analysis highlights a subnetwork containing ELONGATED HYPOCOTYL5 (HY5), a master regulator of deetiolation, in the wild type and not in phytochrome A mutant upon prolonged low R/FR. Network analysis also highlights a direct connection between HY5 and HY5 HOMOLOG (HYH), a gene functionally implicated in the inhibition of hypocotyl elongation and known to be a direct target of the HY5 transcription factor. Kinetics analysis show that the HYH gene is indeed late induced by low R/FR and that its up-regulation depends on the action of HY5, since it does not occur in hy5 mutant. Therefore, we propose that one way plants adapt to a low-R/FR environment is by enhancing HY5 function.read more
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The Multifaceted Roles of HY5 in Plant Growth and Development
TL;DR: Recent advances on HY5 research in diverse aspects of plant development are reviewed and still open questions that need to be addressed in the near future for a complete understanding of its function in plant signaling and beyond are highlighted.
Journal ArticleDOI
The shade‐avoidance syndrome: multiple signals and ecological consequences
Carlos L. Ballaré,Ronald Pierik +1 more
TL;DR: It is suggested that it might be possible to improve crop health at high planting densities by targeting links between phyB and JA signalling, in particular salicylic acid and jasmonic acid.
Journal ArticleDOI
The Arabidopsis bZIP transcription factor family-an update.
TL;DR: The basic (region) leucine zippers (bZIPs) are evolutionarily conserved transcription factors in eukaryotic organisms and are involved in a plethora of functions related to plant development, environmental signalling and stress response.
Journal ArticleDOI
Far-red radiation promotes growth of seedlings by increasing leaf expansion and whole-plant net assimilation
Yu Jin Park,Erik S. Runkle +1 more
TL;DR: It is concluded that FR radiation increases plant growth indirectly through leaf expansion and directly through whole-plant net assimilation and in at least some species, promotes subsequent flowering.
Journal ArticleDOI
Integration of Phytochrome and Cryptochrome Signals Determines Plant Growth during Competition for Light
Mieke de Wit,Mieke de Wit,Diederik H. Keuskamp,Franca J. Bongers,Patricia Hornitschek,Charlotte M. M. Gommers,Emilie Reinen,Carmen Martínez-Cerón,Christian Fankhauser,Ronald Pierik +9 more
TL;DR: It is shown in Arabidopsis thaliana that low B in combination with low R:FR enhances petiole elongation similar to vegetation shade, providing functional context for a low B response in plant competition.
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