High temperature acclimation through PIF4 signaling.

Ambient temperature has direct consequences for plant functioning. Many plant species are able to adjust reproductive timing and development to optimize fitness to changes in ambient temperatures. Understanding the molecular networks of how plants cope with high temperatures is essential to counteract the effects of global warming and to secure future crop productivity. Several recent papers reported that Arabidopsis thaliana responses to changing light conditions and high temperature, and their underlying signaling mechanisms are highly similar and involve the basic helix-loop-helix (bHLH) transcription factor PHYTOCHROME INTERACTING FACTOR 4 (PIF4). In this opinion article we discuss the mechanisms of PIF4-mediated acclimation to increased ambient temperature with focus on timing of flowering and morphological acclimation.

[1]  Stuart A. Casson,et al.  phytochrome B and PIF4 Regulate Stomatal Development in Response to Light Quantity , 2009, Current Biology.

[2]  Jinfang Chu,et al.  PIF4–Mediated Activation of YUCCA8 Expression Integrates Temperature into the Auxin Pathway in Regulating Arabidopsis Hypocotyl Growth , 2012, PLoS genetics.

[3]  D. Inzé,et al.  The SAUR19 subfamily of SMALL AUXIN UP RNA genes promote cell expansion. , 2012, The Plant journal : for cell and molecular biology.

[4]  N. Harberd,et al.  High Temperature-Mediated Adaptations in Plant Architecture Require the bHLH Transcription Factor PIF4 , 2009, Current Biology.

[5]  Hui Shen,et al.  Phytochrome Interacting Factors: central players in phytochrome-mediated light signaling networks. , 2007, Trends in plant science.

[6]  Robert J. Schmitz,et al.  Linking photoreceptor excitation to changes in plant architecture. , 2012, Genes & development.

[7]  E. Huq,et al.  PIF4, a phytochrome‐interacting bHLH factor, functions as a negative regulator of phytochrome B signaling in Arabidopsis , 2002, The EMBO journal.

[8]  P. Wigge,et al.  H2A.Z-Containing Nucleosomes Mediate the Thermosensory Response in Arabidopsis , 2010, Cell.

[9]  Jan Dick,et al.  Recent Plant Diversity Changes on Europe’s Mountain Summits , 2012, Science.

[10]  G. Sandberg,et al.  High temperature promotes auxin-mediated hypocotyl elongation in Arabidopsis. , 1998, Proceedings of the National Academy of Sciences of the United States of America.

[11]  D. Weigel,et al.  A thermosensory pathway controlling flowering time in Arabidopsis thaliana , 2003, Nature Genetics.

[12]  A. Fehér,et al.  The effect of drought and heat stress on reproductive processes in cereals. , 2007, Plant, cell & environment.

[13]  R. Naylor,et al.  Historical Warnings of Future Food Insecurity with Unprecedented Seasonal Heat , 2009, Science.

[14]  P. Maharjan,et al.  High Temperature Stimulates DWARF4 (DWF4) Expression to Increase Hypocotyl Elongation in Arabidopsis , 2011, Journal of Plant Biology.

[15]  D. Alabadí,et al.  Hormonal regulation of temperature-induced growth in Arabidopsis. , 2009, The Plant journal : for cell and molecular biology.

[16]  H. Kawaide,et al.  The main auxin biosynthesis pathway in Arabidopsis , 2011, Proceedings of the National Academy of Sciences.

[17]  C. Fankhauser,et al.  Phytochrome-mediated inhibition of shade avoidance involves degradation of growth-promoting bHLH transcription factors. , 2007, The Plant journal : for cell and molecular biology.

[18]  Frank F Millenaar,et al.  Hormone- and Light-Mediated Regulation of Heat-Induced Differential Petiole Growth in Arabidopsis[W][OA] , 2009, Plant Physiology.

[19]  J. Chory,et al.  Conversion of tryptophan to indole-3-acetic acid by TRYPTOPHAN AMINOTRANSFERASES OF ARABIDOPSIS and YUCCAs in Arabidopsis , 2011, Proceedings of the National Academy of Sciences.

[20]  Richard B. Primack,et al.  Phylogenetic patterns of species loss in Thoreau's woods are driven by climate change , 2008, Proceedings of the National Academy of Sciences.

[21]  Nathan J B Kraft,et al.  Warming experiments underpredict plant phenological responses to climate change , 2012, Nature.

[22]  K. Ljung,et al.  The Arabidopsis YUCCA1 Flavin Monooxygenase Functions in the Indole-3-Pyruvic Acid Branch of Auxin Biosynthesis[W] , 2011, Plant Cell.

[23]  S. Michaels,et al.  Regulation of CONSTANS and FLOWERING LOCUS T Expression in Response to Changing Light Quality1[C][OA] , 2008, Plant Physiology.

[24]  K. Halliday,et al.  Changes in Photoperiod or Temperature Alter the Functional Relationships between Phytochromes and Reveal Roles for phyD and phyE1 , 2003, Plant Physiology.

[25]  R. Mittler,et al.  Abiotic stress, the field environment and stress combination. , 2006, Trends in plant science.

[26]  C. Fankhauser,et al.  A molecular framework for light and gibberellin control of cell elongation , 2008, Nature.

[27]  J. Maloof,et al.  Genomic Analysis of Circadian Clock-, Light-, and Growth-Correlated Genes Reveals PHYTOCHROME-INTERACTING FACTOR5 as a Modulator of Auxin Signaling in Arabidopsis1[C][W][OA] , 2011, Plant Physiology.

[28]  T. Mizuno,et al.  Phytochrome-interacting factor 4 and 5 (PIF4 and PIF5) activate the homeobox ATHB2 and auxin-inducible IAA29 genes in the coincidence mechanism underlying photoperiodic control of plant growth of Arabidopsis thaliana. , 2011, Plant & cell physiology.

[29]  R. Mittler,et al.  Genetic engineering for modern agriculture: challenges and perspectives. , 2010, Annual review of plant biology.

[30]  M. Estelle,et al.  The TRANSPORT INHIBITOR RESPONSE2 Gene Is Required for Auxin Synthesis and Diverse Aspects of Plant Development1[C][W][OA] , 2009, Plant Physiology.

[31]  F. Turck,et al.  Regulation and identity of florigen: FLOWERING LOCUS T moves center stage. , 2008, Annual review of plant biology.

[32]  F. Tardieu,et al.  Temperature responses of developmental processes have not been affected by breeding in different ecological areas for 17 crop species. , 2012, The New phytologist.

[33]  Katja E. Jaeger,et al.  PHYTOCHROME INTERACTING FACTOR4 controls the thermosensory activation of flowering , 2012, Nature.

[34]  J. Chory,et al.  Regulation of flowering time by light quality , 2003, Nature.

[35]  R. Amasino,et al.  Acceleration of Flowering during Shade Avoidance in Arabidopsis Alters the Balance between FLOWERING LOCUS C-Mediated Repression and Photoperiodic Induction of Flowering1[W][OA] , 2008, Plant Physiology.

[36]  J. Maloof,et al.  Genes underlying quantitative variation in ecologically important traits: PIF4 (PHYTOCHROME INTERACTING FACTOR 4) is associated with variation in internode length, flowering time, and fruit set in Arabidopsis thaliana , 2010, Molecular ecology.

[37]  S. Penfield.  Temperature perception and signal transduction in plants. , 2008, The New phytologist.

[38]  Stacey L. Harmer,et al.  Rhythmic growth explained by coincidence between internal and external cues , 2007, Nature.

[39]  J. Casal,et al.  Temperature-dependent internode elongation in vegetative plants of Arabidopsis thaliana lacking phytochrome B and cryptochrome 1 , 2000, Planta.

[40]  J. Reed,et al.  Arabidopsis SHY2/IAA3 Inhibits Auxin-Regulated Gene Expression Article, publication date, and citation information can be found at www.plantcell.org/cgi/doi/10.1105/tpc.010283. , 2002, The Plant Cell Online.

[41]  Joanne Chory,et al.  Rapid Synthesis of Auxin via a New Tryptophan-Dependent Pathway Is Required for Shade Avoidance in Plants , 2008, Cell.

[42]  Keithanne Mockaitis,et al.  Auxin receptors and plant development: a new signaling paradigm. , 2008, Annual review of cell and developmental biology.

[43]  W. Gray,et al.  PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) regulates auxin biosynthesis at high temperature , 2011, Proceedings of the National Academy of Sciences.

[44]  A. Fitter,et al.  Rapid Changes in Flowering Time in British Plants , 2002, Science.

[45]  D. Weigel,et al.  Potent Induction of Arabidopsis thaliana Flowering by Elevated Growth Temperature , 2006, PLoS genetics.

[46]  K. Halliday,et al.  Phytochrome control of flowering is temperature sensitive and correlates with expression of the floral integrator FT. , 2003, The Plant journal : for cell and molecular biology.

[47]  A. Hetherington,et al.  High temperature exposure increases plant cooling capacity , 2012, Current Biology.

[48]  J. Reed,et al.  Arabidopsis SMALL AUXIN UP RNA63 promotes hypocotyl and stamen filament elongation. , 2012, The Plant journal : for cell and molecular biology.

[49]  C. Fankhauser,et al.  Light receptor action is critical for maintaining plant biomass at warm ambient temperatures. , 2011, The Plant journal : for cell and molecular biology.

[50]  K. Ljung,et al.  RETRACTED: The AFB4 Auxin Receptor Is a Negative Regulator of Auxin Signaling in Seedlings , 2011, Current Biology.

[51]  T. Mizuno,et al.  The circadian clock regulates the photoperiodic response of hypocotyl elongation through a coincidence mechanism in Arabidopsis thaliana. , 2009, Plant & cell physiology.

[52]  I. Xenarios,et al.  Phytochrome interacting factors 4 and 5 control seedling growth in changing light conditions by directly controlling auxin signaling. , 2012, The Plant journal : for cell and molecular biology.

[53]  Y. van de Peer,et al.  PLAZA: A Comparative Genomics Resource to Study Gene and Genome Evolution in Plants[W] , 2009, The Plant Cell Online.

[54]  P. Quail,et al.  PIFs: pivotal components in a cellular signaling hub. , 2011, Trends in plant science.

[55]  Trudie Allen,et al.  Phytochrome-mediated inhibition of shade avoidance involves degradation of growth-promoting bHLH transcription factors , 2007 .

[56]  M. Sykes,et al.  Climate change threats to plant diversity in Europe. , 2005, Proceedings of the National Academy of Sciences of the United States of America.

[57]  J. Botto,et al.  Differential genetic variation in adaptive strategies to a common environmental signal in Arabidopsis accessions: phytochrome‐mediated shade avoidance , 2002 .

[58]  Olivier Michielin,et al.  Inhibition of the shade avoidance response by formation of non‐DNA binding bHLH heterodimers , 2009, The EMBO journal.