Rewiring of auxin signaling under persistent shade
Ornella Pucciariello,Martina Legris,Cecilia Costigliolo Rojas Rojas,María José Iglesias,Carlos Esteban Hernando,Carlos Alberto Alejandro Dezar,Martin P. Vazquez,Marcelo J. Yanovsky,Scott A. Finlayson,Salomé Prat,Jorge J. Casal,Jorge J. Casal +11 more
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TLDR
Under prolonged shade, persistent neighbor cues reinforce growth responses in addition to promoting auxin-responsive gene expression in Arabidopsis and soybean and it is proposed that prolonged shade rewires the connectivity between light and auxin signaling to sustain shade avoidance without enhanced auxin levels.Abstract:
Light cues from neighboring vegetation rapidly initiate plant shade-avoidance responses. Despite our detailed knowledge of the early steps of this response, the molecular events under prolonged shade are largely unclear. Here we show that persistent neighbor cues reinforce growth responses in addition to promoting auxin-responsive gene expression in Arabidopsis and soybean. However, while the elevation of auxin levels is well established as an early event, in Arabidopsis, the response to prolonged shade occurs when auxin levels have declined to the prestimulation values. Remarkably, the sustained low activity of phytochrome B under prolonged shade led to (i) decreased levels of PHYTOCHROME INTERACTING FACTOR 4 (PIF4) in the cotyledons (the organs that supply auxin) along with increased levels in the vascular tissues of the stem, (ii) elevated expression of the PIF4 targets INDOLE-3-ACETIC ACID 19 (IAA19) and IAA29, which in turn reduced the expression of the growth-repressive IAA17 regulator, (iii) reduced abundance of AUXIN RESPONSE FACTOR 6, (iv) reduced expression of MIR393 and increased abundance of its targets, the auxin receptors, and (v) elevated auxin signaling as indicated by molecular markers. Mathematical and genetic analyses support the physiological role of this system-level rearrangement. We propose that prolonged shade rewires the connectivity between light and auxin signaling to sustain shade avoidance without enhanced auxin levels.read more
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Journal ArticleDOI
Molecular mechanisms underlying phytochrome-controlled morphogenesis in plants
TL;DR: Current models of phytochrome function connecting light-induced conformational changes to physiological outputs are reviewed, to highlight open questions for future research and compare and contrast phy tochrome responses and signaling mechanisms among land plants.
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PHYTOCHROME INTERACTING FACTOR 7 is important for early responses to elevated temperature in Arabidopsis seedlings
Anne-Sophie Fiorucci,Vinicius Costa Galvão,Yetkin Çaka Ince,Alessandra Boccaccini,Anupama Goyal,Laure Allenbach Petrolati,Martine Trevisan,Christian Fankhauser +7 more
TL;DR: The results reveal the importance of PIF7 for thermomorphogenesis and indicate that Pif7 and PIF4 likely depend on each other possibly by forming heterodimers, which may contribute to the thermomorphogenic response.
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Genetic analysis of the Arabidopsis TIR1/AFB auxin receptors reveals both overlapping and specialized functions.
Michael J. Prigge,Matthieu Pierre Platre,Nikita Kadakia,Yi Zhang,Kathleen Greenham,Whitnie Szutu,Bipin K. Pandey,Rahul Bhosale,Malcolm J. Bennett,Wolfgang Busch,Mark Estelle +10 more
TL;DR: This analysis reveals extensive functional overlap between even the most distantly related TIR1/AFB genes except for AFB1, which has a specialized function in rapid auxin-dependent inhibition of root growth and early phase of root gravitropism.
Journal ArticleDOI
Three Auxin Response Factors Promote Hypocotyl Elongation.
Jason W. Reed,Miin Feng Wu,Paul H. Reeves,Charles Hodgens,Vandana Yadav,Scott Hayes,Ronald Pierik +6 more
TL;DR: Three Auxin Response Factors control hypocotyl elongation in Arabidopsis under environmental conditions that require rapid growth and despite having decreased auxin responses, the ARF-deficient plants responded to brassinosteroid and gibberellin, indicating that different hormones can act partially independently.
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Mechanisms Underlying the Environmentally Induced Plasticity of Leaf Morphology.
TL;DR: The current knowledge on the influence of different environmental signals on leaf size and shape, their integration as well as their importance for plant adaptation are discussed.
References
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Journal ArticleDOI
A Plant miRNA Contributes to Antibacterial Resistance by Repressing Auxin Signaling
Lionel Navarro,Patrice Dunoyer,Florence Jay,Benedict Arnold,Nihal Dharmasiri,Mark Estelle,Olivier Voinnet,Jonathan D. G. Jones +7 more
TL;DR: It is shown that a flagellin-derived peptide induces a plant microRNA (miRNA) that negatively regulates messenger RNAs for the F-box auxin receptors TIR1, AFB2, and AFB3, implicating auxin in disease susceptibility and miRNA-mediated suppression of auxin signaling in resistance.
Journal ArticleDOI
Rapid synthesis of auxin via a new tryptophan-dependent pathway is required for shade avoidance in plants.
Yi Tao,Jean-Luc Ferrer,Jean-Luc Ferrer,Karin Ljung,Florence Pojer,Fangxin Hong,Fangxin Hong,Jeff A. Long,Lin Li,Javier E. Moreno,Marianne E. Bowman,Lauren J. Ivans,Lauren J. Ivans,Youfa Cheng,Jason Lim,Yunde Zhao,Carlos L. Ballaré,Göran Sandberg,Joseph P. Noel,Joanne Chory +19 more
TL;DR: It is shown that TAA1 catalyzes the formation of indole-3-pyruvic acid (IPA) from L-tryptophan (L-Trp), the first step in a previously proposed, but uncharacterized, auxin biosynthetic pathway, rapidly deployed to synthesize auxin at the high levels required to initiate the multiple changes in body plan associated with shade avoidance.
Journal ArticleDOI
PIFs: pivotal components in a cellular signaling hub
TL;DR: PIFs have broader roles than previously appreciated, functioning as a cellular signaling hub that integrates multiple signals to orchestrate regulation of the transcriptional network that drives multiple facets of downstream morphogenesis.
Journal ArticleDOI
The ELF4–ELF3–LUX complex links the circadian clock to diurnal control of hypocotyl growth
Dmitri A. Nusinow,Anne Helfer,Elizabeth E. Hamilton,Jasmine J. King,Takato Imaizumi,Takato Imaizumi,Thomas F. Schultz,Thomas F. Schultz,Eva M. Farré,Eva M. Farré,Steve A. Kay +10 more
TL;DR: The evening complex underlies the molecular basis for circadian gating of hypocotyl growth in the early evening, and mutations in PIF4 and/or PIF5 are epistatic to the loss of the ELF4–ELF3–LUX complex, suggesting that regulation of Pif4 and PIF 5 is a crucial function of the complex.
Journal ArticleDOI
Phytochrome-mediated inhibition of shade avoidance involves degradation of growth-promoting bHLH transcription factors
TL;DR: In this paper, the authors show that PIF4 and PIF5 act early in the phytochrome signaling pathway to promote the shade-avoidance response in Arabidopsis.
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