Light is crucial for plant life, and perception of the light environment dictates plant growth, morphology, and developmental changes. Such adjustments in growth and development in response to light conditions are often established through changes in hormone levels and signaling. This review discusses examples of light-regulated processes throughout a plant's life cycle for which it is known how light signals lead to hormonal regulation. Light acts as an important developmental switch in germination, photomorphogenesis, and transition to flowering, and light cues are essential to ensure light capture through architectural changes during phototropism and the shade avoidance response. In describing well-established links between light perception and hormonal changes, we aim to give insight into the mechanisms that enable plants to thrive in variable light environments.


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Literature Cited

  1. Andres F, Coupland G. 1.  2012. The genetic basis of flowering responses to seasonal cues. Nat. Rev. Genet. 13:627–39 [Google Scholar]
  2. Andres F, Porri A, Torti S, Mateos J, Romera-Branchat M. 2.  et al. 2014. SHORT VEGETATIVE PHASE reduces gibberellin biosynthesis at the Arabidopsis shoot apex to regulate the floral transition. PNAS 111:E2760–69Showed that reduced SVP expression leads to de-repression of GA biosynthesis genes at the SAM during photoperiodic flowering. [Google Scholar]
  3. Arsovski AA, Galstyan A, Guseman JM, Nemhauser JL. 3.  2012. Photomorphogenesis. Arabidopsis Book 10e0147 [Google Scholar]
  4. Bai M-Y, Shang J-X, Oh E, Fan M, Bai Y. 4.  et al. 2012. Brassinosteroid, gibberellin and phytochrome impinge on a common transcription module in Arabidopsis. Nat. Cell Biol. 14:810–17 [Google Scholar]
  5. Ballaré CL, Scopel AL, Roush ML, Radosevich SR. 5.  1995. How plants find light in patchy canopies. A comparison between wild-type and phytochrome-B-deficient mutant plants of cucumber. Funct. Ecol. 9:859–68 [Google Scholar]
  6. Ballaré CL, Scopel AL, Sánchez RA. 6.  1990. Far-red radiation reflected from adjacent leaves: an early signal of competition in plant canopies. Science 247:329–32 [Google Scholar]
  7. Barbosa ICR, Zourelidou M, Willige BC, Weller B, Schwechheimer C. 7.  2014. D6 PROTEIN KINASE activates auxin transport-dependent growth and PIN-FORMED phosphorylation at the plasma membrane. Dev. Cell 29:674–85 [Google Scholar]
  8. Bargmann BOR, Estelle M. 8.  2014. Auxin perception: in the IAA of the beholder. Physiol. Plant. 151:52–61 [Google Scholar]
  9. Beall FD, Yeung EC, Pharis RP. 9.  1996. Far-red light stimulates internode elongation, cell division, cell elongation, and gibberellin levels in bean. Can. J. Bot. 74:743–52 [Google Scholar]
  10. Bentsink L, Koornneef M. 10.  2008. Seed dormancy and germination. Arabidopsis Book 6:e0119 [Google Scholar]
  11. Borthwick HA, Hendricks SB, Parker MW, Toole EH, Toole VK. 11.  1952. A reversible photoreaction controlling seed germination. PNAS 38:662–66 [Google Scholar]
  12. Bou-Torrent J, Galstyan A, Gallemí M, Cifuentes-Esquivel N, Molina-Contreras MJ. 12.  et al. 2014. Plant proximity perception dynamically modulates hormone levels and sensitivity in Arabidopsis. J. Exp. Bot. 65:2937–47 [Google Scholar]
  13. Briggs WR, Beck CF, Cashmore AR, Christie JM, Hughes J. 13.  et al. 2001. The phototropin family of photoreceptors. Plant Cell 13:993–97 [Google Scholar]
  14. Carabelli M, Possenti M, Sessa G, Ciolfi A, Sassi M. 14.  et al. 2007. Canopy shade causes a rapid and transient arrest in leaf development through auxin-induced cytokinin oxidase activity. Genes Dev. 21:1863–68 [Google Scholar]
  15. Casal JJ. 15.  2012. Shade avoidance. Arabidopsis Book 10:e0157 [Google Scholar]
  16. Cerdán PD, Chory J. 16.  2003. Regulation of flowering time by light quality. Nature 423:881–85 [Google Scholar]
  17. Chaves I, Pokorny R, Byrdin M, Hoang N, Ritz T. 17.  et al. 2011. The cryptochromes: blue light photoreceptors in plants and animals. Annu. Rev. Plant Biol. 62:335–64 [Google Scholar]
  18. Cho J-N, Ryu J-Y, Jeong Y-M, Park J, Song J-J. 18.  et al. 2012. Control of seed germination by light-induced histone arginine demethylation activity. Dev. Cell 22:736–48Demonstrated that during germination, light regulates chromatin modification of two GA biosynthesis genes. [Google Scholar]
  19. Christie JM, Blackwood L, Petersen J, Sullivan S. 19.  2015. Plant flavoprotein photoreceptors. Plant Cell Physiol. 56:401–13 [Google Scholar]
  20. Christie JM, Murphy AS. 20.  2013. Shoot phototropism in higher plants: new light through old concepts. Am. J. Bot. 100:35–46 [Google Scholar]
  21. Christie JM, Yang H, Richter GL, Sullivan S, Thomson CE. 21.  et al. 2011. Phot1 inhibition of ABCB19 primes lateral auxin fluxes in the shoot apex required for phototropism. PLOS Biol. 9:e1001076Showed that phosphorylation of ABCB19 is important to reduce downward auxin flux during phototropism. [Google Scholar]
  22. Corbesier L, Vincent C, Jang S, Fornara F, Fan Q. 22.  et al. 2007. FT protein movement contributes to long-distance signaling in floral induction of Arabidopsis. Science 316:1030–33 [Google Scholar]
  23. Crocco CD, Locascio A, Escudero CM, Alabadí D, Blázquez MA, Botto JF. 23.  2015. The transcriptional regulator BBX24 impairs DELLA activity to promote shade avoidance in Arabidopsis thaliana. Nat. Commun. 6:6202 [Google Scholar]
  24. Daviere J-M, Achard P. 24.  2013. Gibberellin signaling in plants. Development 140:1147–51 [Google Scholar]
  25. de Lucas M, Davière JM, Rodríguez-Falcón M, Pontin M, Iglesias-Pedraz JM. 25.  et al. 2008. A molecular framework for light and gibberellin control of cell elongation. Nature 451:480–84 [Google Scholar]
  26. de Wit M, Ljung K, Fankhauser C. 26.  2015. Contrasting growth responses in lamina and petiole during neighbor detection depend on differential auxin responsiveness rather than different auxin levels. New Phytol. 208:198–209 [Google Scholar]
  27. de Wit M, Lorrain S, Fankhauser C. 27.  2013. Auxin-mediated plant architectural changes in response to shade and high temperature. Physiol. Plant. 151:13–24 [Google Scholar]
  28. Devlin PF, Patel SR, Whitelam GC. 28.  1998. Phytochrome E influences internode elongation and flowering time in Arabidopsis. Plant Cell 10:1479–87 [Google Scholar]
  29. Devlin PF, Robson PR, Patel SR, Goosey L, Sharrock RA, Whitelam GC. 29.  1999. Phytochrome D acts in the shade-avoidance syndrome in Arabidopsis by controlling elongation growth and flowering time. Plant Physiol. 119:909–16 [Google Scholar]
  30. Ding Z, Galvan-Ampudia CS, Demarsy E, Langowski L, Kleine-Vehn J. 30.  et al. 2011. Light-mediated polarization of the PIN3 auxin transporter for the phototropic response in Arabidopsis. Nat. Cell Biol. 13:447–52Showed that PIN3 becomes more laterally distributed in endodermal hypocotyl cells during phototropism, which might direct auxin flux. [Google Scholar]
  31. Djakovic-Petrovic T, de Wit M, Voesenek LACJ, Pierik R. 31.  2007. DELLA protein function in growth responses to canopy signals. Plant J. 51:117–26 [Google Scholar]
  32. Dorca-Fornell C, Gregis V, Grandi V, Coupland G, Colombo L, Kater MM. 32.  2011. The Arabidopsis SOC1-like genes AGL42, AGL71 and AGL72 promote flowering in the shoot apical and axillary meristems. Plant J. 67:1006–17 [Google Scholar]
  33. Ecker JR. 33.  1995. The ethylene signal transduction pathway in plants. Science 268:667–75 [Google Scholar]
  34. Endo M, Nakamura S, Araki T, Mochizuki N, Nagatani A. 34.  2005. Phytochrome B in the mesophyll delays flowering by suppressing FLOWERING LOCUS T expression in Arabidopsis vascular bundles. Plant Cell 17:1941–52 [Google Scholar]
  35. Endo M, Tanigawa Y, Murakami T, Araki T, Nagatani A. 35.  2013. PHYTOCHROME-DEPENDENT LATE-FLOWERING accelerates flowering through physical interactions with phytochrome B and CONSTANS. PNAS 110:18017–22 [Google Scholar]
  36. Eriksson S, Böhlenius H, Moritz T, Nilsson O. 36.  2006. GA4 is the active gibberellin in the regulation of LEAFY transcription and Arabidopsis floral initiation. Plant Cell 18:2172–81 [Google Scholar]
  37. Fankhauser C, Christie JM. 37.  2015. Plant phototropic growth. Curr. Biol. 25:R384–89 [Google Scholar]
  38. Feng S, Martinez C, Gusmaroli G, Wang Y, Zhou J. 38.  et al. 2008. Coordinated regulation of Arabidopsis thaliana development by light and gibberellins. Nature 451:475–79 [Google Scholar]
  39. Franklin KA, Praekelt U, Stoddart WM, Billingham OE, Halliday KJ, Whitelam GC. 39.  2003. Phytochromes B, D, and E act redundantly to control multiple physiological responses in Arabidopsis. Plant Physiol. 131:1340–46 [Google Scholar]
  40. Gabriele S, Rizza A, Martone J, Circelli P, Costantino P, Vittorioso P. 40.  2010. The Dof protein DAG1 mediates PIL5 activity on seed germination by negatively regulating GA biosynthetic gene AtGA3ox1. Plant J. 61:312–23 [Google Scholar]
  41. Gallie DR. 41.  2015. Ethylene receptors in plants—why so much complexity?. F1000Prime Rep. 7:39 [Google Scholar]
  42. Galvão VC, Horrer D, Kuttner F, Schmid M. 42.  2012. Spatial control of flowering by DELLA proteins in Arabidopsis thaliana. Development 139:4072–82 [Google Scholar]
  43. Galvão VC, Schmid M. 43.  2014. Regulation of flowering by endogenous signals. The Molecular Genetics of Floral Transition and Flower Development F Fornara 63–102 Adv. Bot. Res 72 London: Academic [Google Scholar]
  44. Gocal GF, Sheldon CC, Gubler F, Moritz T, Bagnall DJ. 44.  et al. 2001. GAMYB-like genes, flowering, and gibberellin signaling in Arabidopsis. Plant Physiol. 127:1682–93 [Google Scholar]
  45. Goeschl JD, Rappaport L, Pratt HK. 45.  1966. Ethylene as a factor regulating the growth of pea epicotyls subjected to physical stress. Plant Physiol. 41:877–84 [Google Scholar]
  46. Gommers CMM, Visser EJW, St. Onge KR, Voesenek LACJ, Pierik R. 46.  2013. Shade tolerance: when growing tall is not an option. Trends Plant Sci. 18:65–71 [Google Scholar]
  47. Goto N, Kumagai T, Koornneef M. 47.  1991. Flowering responses to light-breaks in photomorphogenic mutants of Arabidopsis thaliana, a long-day plant. Physiol. Plant. 83:209–15 [Google Scholar]
  48. Goyal A, Szarzynska B, Fankhauser C. 48.  2013. Phototropism: at the crossroads of light-signaling pathways. Trends Plant Sci. 18:393–401 [Google Scholar]
  49. Hersch M, Lorrain S, de Wit M, Trevisan M, Ljung K. 49.  et al. 2014. Light intensity modulates the regulatory network of the shade avoidance response in Arabidopsis. PNAS 111:6515–20 [Google Scholar]
  50. Hisamatsu T, King RW. 50.  2008. The nature of floral signals in Arabidopsis. II. Roles for FLOWERING LOCUS T (FT) and gibberellin. J. Exp. Bot. 59:3821–29 [Google Scholar]
  51. Hisamatsu T, King RW, Helliwell CA, Koshioka M. 51.  2005. The involvement of gibberellin 20-oxidase genes in phytochrome-regulated petiole elongation of Arabidopsis. Plant Physiol. 138:1106–16 [Google Scholar]
  52. Hohm T, Demarsy E, Quan C, Allenbach Petrolati L, Preuten T. 52.  et al. 2014. Plasma membrane H+-ATPase regulation is required for auxin gradient formation preceding phototropic growth. Mol. Syst. Biol. 10:751Indicated that phosphorylation of H+-ATPases during phototropism is important for auxin fluxes during directional growth. [Google Scholar]
  53. Holmes MG, Smith H. 53.  1975. The function of phytochrome in plants growing in the natural environment. Nature 254:512–14 [Google Scholar]
  54. Hornitschek P, Kohnen MV, Lorrain S, Rougemont J, Ljung K. 54.  et al. 2012. Phytochrome interacting factors 4 and 5 control seedling growth in changing light conditions by directly controlling auxin signaling. Plant J. 71:699–711Showed that PIF4 and PIF5 directly regulate many auxin-related genes, including biosynthesis genes during shade avoidance. [Google Scholar]
  55. Huang X, Ouyang X, Deng XW. 55.  2014. Beyond repression of photomorphogenesis: role switching of COP/DET/FUS in light signaling. Curr. Opin. Plant Biol. 21:96–103 [Google Scholar]
  56. Huq E, Al-Sady B, Hudson M, Kim C, Apel K, Quail PH. 56.  2004. Phytochrome-interacting factor 1 is a critical bHLH regulator of chlorophyll biosynthesis. Science 305:1937–41 [Google Scholar]
  57. Immink RGH, Pose D, Ferrario S, Ott F, Kaufmann K. 57.  et al. 2012. Characterization of SOC1's central role in flowering by the identification of its upstream and downstream regulators. Plant Physiol. 160:433–49 [Google Scholar]
  58. Inigo S, Alvarez MJ, Strasser B, Califano A, Cerdán PD. 58.  2012. PFT1, the MED25 subunit of the plant Mediator complex, promotes flowering through CONSTANS dependent and independent mechanisms in Arabidopsis. Plant J. 69:601–12 [Google Scholar]
  59. Inoue S-I, Kinoshita T, Matsumoto M, Nakayama KI, Doi M, Shimazaki K-I. 59.  2008. Blue light-induced autophosphorylation of phototropin is a primary step for signaling. PNAS 105:5626–31 [Google Scholar]
  60. Jaeger KE, Wigge PA. 60.  2007. FT protein acts as a long-range signal in Arabidopsis. Curr. Biol. 17:1050–54 [Google Scholar]
  61. Jang S, Marchal V, Panigrahi KCS, Wenkel S, Soppe W. 61.  et al. 2008. Arabidopsis COP1 shapes the temporal pattern of CO accumulation conferring a photoperiodic flowering response. EMBO J. 27:1277–88 [Google Scholar]
  62. Jenkins GI. 62.  2014. The UV-B photoreceptor UVR8: from structure to physiology. Plant Cell 26:21–37 [Google Scholar]
  63. Jung J-H, Ju Y, Seo PJ, Lee J-H, Park C-M. 63.  2012. The SOC1-SPL module integrates photoperiod and gibberellic acid signals to control flowering time in Arabidopsis. Plant J. 69:577–88 [Google Scholar]
  64. Kagawa T, Kimura M, Wada M. 64.  2009. Blue light-induced phototropism of inflorescence stems and petioles is mediated by phototropin family members phot1 and phot2. Plant Cell Physiol. 50:1774–85 [Google Scholar]
  65. Kami C, Lorrain S, Hornitschek P, Fankhauser C. 65.  2010. Light-regulated plant growth and development. Curr. Top. Dev. Biol. 91:29–66 [Google Scholar]
  66. Kanyuka K, Praekelt U, Franklin KA, Billingham OE, Hooley R. 66.  et al. 2003. Mutations in the huge Arabidopsis gene BIG affect a range of hormone and light responses. Plant J. 35:57–70 [Google Scholar]
  67. Kaufmann K, Wellmer F, Muino JM, Ferrier T, Wuest SE. 67.  et al. 2010. Orchestration of floral initiation by APETALA1. Science 328:85–89 [Google Scholar]
  68. Keuskamp DH, Pollmann S, Voesenek LACJ, Peeters AJM, Pierik R. 68.  2010. Auxin transport through PIN-FORMED 3 (PIN3) controls shade avoidance and fitness during competition. PNAS 107:22740–44 [Google Scholar]
  69. Kim DH, Yamaguchi S, Lim S, Oh E, Park J. 69.  et al. 2008. SOMNUS, a CCCH-type zinc finger protein in Arabidopsis, negatively regulates light-dependent seed germination downstream of PIL5. Plant Cell 20:1260–77 [Google Scholar]
  70. King RW, Hisamatsu T, Goldschmidt EE, Blundell C. 70.  2008. The nature of floral signals in Arabidopsis. I. Photosynthesis and a far-red photoresponse independently regulate flowering by increasing expression of FLOWERING LOCUS T (FT). J. Exp. Bot. 59:3811–20 [Google Scholar]
  71. Knott JE. 71.  1934. Effect of localized photoperiod on spinach. Proc. Am. Soc. Hortic. Sci. 31:152–54 [Google Scholar]
  72. Kozuka T, Kobayashi J, Horiguchi G, Demura T, Sakakibara H. 72.  et al. 2010. Involvement of auxin and brassinosteroid in the regulation of petiole elongation under the shade. Plant Physiol. 153:1608–18 [Google Scholar]
  73. Krishna Reddy S, Finlayson SA. 73.  2014. Phytochrome B promotes branching in Arabidopsis by suppressing auxin signaling. Plant Physiol. 164:1542–50 [Google Scholar]
  74. Lang A. 74.  1957. The effect of gibberellin upon flower formation. PNAS 43:709–17 [Google Scholar]
  75. Lau OS, Deng XW. 75.  2010. Plant hormone signaling lightens up: integrators of light and hormones. Curr. Opin. Plant Biol. 13:571–77 [Google Scholar]
  76. Lazaro A, Valverde F, Pineiro M, Jarillo JA. 76.  2012. The Arabidopsis E3 ubiquitin ligase HOS1 negatively regulates CONSTANS abundance in the photoperiodic control of flowering. Plant Cell 24:982–99 [Google Scholar]
  77. Lee KP, Piskurewicz U, Tureckova V, Carat S, Chappuis R. 77.  et al. 2012. Spatially and genetically distinct control of seed germination by phytochromes A and B. Genes Dev. 26:1984–96Demonstrated that phyB acts in the endosperm and phyA in the embryo during light-dependent germination. [Google Scholar]
  78. Leivar P, Monte E. 78.  2014. PIFs: systems integrators in plant development. Plant Cell 26:56–78 [Google Scholar]
  79. Leivar P, Monte E, Oka Y, Liu T, Carle C. 79.  et al. 2008. Multiple phytochrome-interacting bHLH transcription factors repress premature seedling photomorphogenesis in darkness. Curr. Biol. 18:1815–23 [Google Scholar]
  80. Leivar P, Tepperman JM, Cohn MM, Monte E, Al-Sady B. 80.  et al. 2012. Dynamic antagonism between phytochromes and PIF family basic helix-loop-helix factors induces selective reciprocal responses to light and shade in a rapidly responsive transcriptional network in Arabidopsis. Plant Cell 24:1398–419 [Google Scholar]
  81. Li L, Ljung K, Breton G, Schmitz RJ, Pruneda-Paz J. 81.  et al. 2012. Linking photoreceptor excitation to changes in plant architecture. Genes Dev. 26:785–90Showed that PIF7 regulates transcription of auxin-related genes and directly binds auxin biosynthesis genes during shade avoidance. [Google Scholar]
  82. Liu L-J, Zhang Y-C, Li Q-H, Sang Y, Mao J. 82.  et al. 2008. COP1-mediated ubiquitination of CONSTANS is implicated in cryptochrome regulation of flowering in Arabidopsis. Plant Cell 20:292–306 [Google Scholar]
  83. Ljung K. 83.  2013. Auxin metabolism and homeostasis during plant development. Development 140:943–50 [Google Scholar]
  84. Lorrain S, Allen T, Duek PD, Whitelam GC, Fankhauser C. 84.  2008. Phytochrome-mediated inhibition of shade avoidance involves degradation of growth-promoting bHLH transcription factors. Plant J. 53:312–23 [Google Scholar]
  85. Lu X-D, Zhou C-M, Xu P-B, Luo Q, Lian H-L, Yang H-Q. 85.  2015. Red-light-dependent interaction of phyB with SPA1 promotes COP1-SPA1 dissociation and photomorphogenic development in Arabidopsis. Mol. Plant 8:467–78 [Google Scholar]
  86. Mateos JL, Madrigal P, Tsuda K, Rawat V, Richter R. 86.  et al. 2015. Combinatorial activities of SHORT VEGETATIVE PHASE and FLOWERING LOCUS C define distinct modes of flowering regulation in Arabidopsis. Genome Biol. 16:31 [Google Scholar]
  87. Mathieu J, Warthmann N, Kuttner F, Schmid M. 87.  2007. Export of FT protein from phloem companion cells is sufficient for floral induction in Arabidopsis. Curr. Biol. 17:1055–60 [Google Scholar]
  88. Merchante C, Alonso JM, Stepanova AN. 88.  2013. Ethylene signaling: simple ligand, complex regulation. Curr. Opin. Plant Biol. 16:554–60 [Google Scholar]
  89. Moglich A, Yang X, Ayers RA, Moffat K. 89.  2010. Structure and function of plant photoreceptors. Annu. Rev. Plant Biol. 61:21–47 [Google Scholar]
  90. Morelli G, Ruberti I. 90.  2000. Shade avoidance responses. Driving auxin along lateral routes. Plant Physiol. 122:621–26 [Google Scholar]
  91. Nozue K, Harmer SL, Maloof JN. 91.  2011. Genomic analysis of circadian clock-, light-, and growth-correlated genes reveals PHYTOCHROME-INTERACTING FACTOR5 as a modulator of auxin signaling in Arabidopsis. Plant Physiol. 156:357–72 [Google Scholar]
  92. Nozue K, Tat AV, Kumar Devisetty U, Robinson M, Mumbach MR. 92.  et al. 2015. Shade avoidance components and pathways in adult plants revealed by phenotypic profiling. PLOS Genet. 11:e1004953 [Google Scholar]
  93. Oh E, Kang H, Yamaguchi S, Park J, Lee D. 93.  et al. 2009. Genome-wide analysis of genes targeted by PHYTOCHROME INTERACTING FACTOR 3-LIKE5 during seed germination in Arabidopsis. Plant Cell 21:403–19 [Google Scholar]
  94. Oh E, Yamaguchi S, Hu J, Yusuke J, Jung B. 94.  et al. 2007. PIL5, a phytochrome-interacting bHLH protein, regulates gibberellin responsiveness by binding directly to the GAI and RGA promoters in Arabidopsis seeds. Plant Cell 19:1192–208 [Google Scholar]
  95. Oh E, Zhu J-Y, Bai M-Y, Arenhart RA, Sun Y, Wang Z-Y. 95.  2014. Cell elongation is regulated through a central circuit of interacting transcription factors in the Arabidopsis hypocotyl. eLife 3:e03031 [Google Scholar]
  96. Oh E, Zhu J-Y, Wang Z-Y. 96.  2012. Interaction between BZR1 and PIF4 integrates brassinosteroid and environmental responses. Nat. Cell Biol. 14:802–9 [Google Scholar]
  97. Osnato M, Castillejo C, Matías-Hernández L, Pelaz S. 97.  2012. TEMPRANILLO genes link photoperiod and gibberellin pathways to control flowering in Arabidopsis. Nat. Commun. 3:808Demonstrated that TEM degradation is regulated by photoperiod and leads to de-repression of GA biosynthesis genes during flowering. [Google Scholar]
  98. Park J, Lee N, Kim W, Lim S, Choi G. 98.  2011. ABI3 and PIL5 collaboratively activate the expression of SOMNUS by directly binding to its promoter in imbibed Arabidopsis seeds. Plant Cell 23:1404–15 [Google Scholar]
  99. Parks BM, Quail PH, Hangarter RP. 99.  1996. Phytochrome A regulates red-light induction of phototropic enhancement in Arabidopsis. Plant Physiol. 110:155–62 [Google Scholar]
  100. Parks BM, Spalding EP. 100.  1999. Sequential and coordinated action of phytochromes A and B during Arabidopsis stem growth revealed by kinetic analysis. PNAS 96:14142–46 [Google Scholar]
  101. Pierik R, de Wit M. 101.  2014. Shade avoidance: phytochrome signalling and other aboveground neighbour detection cues. J. Exp. Bot. 65:2815–24 [Google Scholar]
  102. Pierik R, Whitelam GC, Voesenek LACJ, de Kroon H, Visser EJW. 102.  2004. Canopy studies on ethylene-insensitive tobacco identify ethylene as a novel element in blue light and plant-plant signalling. Plant J. 38:310–19 [Google Scholar]
  103. Piskurewicz U, Tureckova V, Lacombe E, Lopez-Molina L. 103.  2009. Far-red light inhibits germination through DELLA-dependent stimulation of ABA synthesis and ABI3 activity. EMBO J. 28:2259–71 [Google Scholar]
  104. Porri A, Torti S, Romera-Branchat M, Coupland G. 104.  2012. Spatially distinct regulatory roles for gibberellins in the promotion of flowering of Arabidopsis under long photoperiods. Development 139:2198–209 [Google Scholar]
  105. Preuten T, Hohm T, Bergmann S, Fankhauser C. 105.  2013. Defining the site of light perception and initiation of phototropism in Arabidopsis. Curr. Biol. 23:1934–38 [Google Scholar]
  106. Procko C, Crenshaw CM, Ljung K, Noel JP, Chory J. 106.  2014. Cotyledon-generated auxin is required for shade-induced hypocotyl growth in Brassica rapa. Plant Physiol. 165:1285–301 [Google Scholar]
  107. Reed JW, Nagpal P, Poole DS, Furuya M, Chory J. 107.  1993. Mutations in the gene for the red/far-red light receptor phytochrome B alter cell elongation and physiological responses throughout Arabidopsis development. Plant Cell 5:147–57 [Google Scholar]
  108. Rizzini L, Favory J-J, Cloix C, Faggionato D, O'Hara A. 108.  et al. 2011. Perception of UV-B by the Arabidopsis UVR8 protein. Science 332:103–6 [Google Scholar]
  109. Rolauffs S, Fackendahl P, Sahm J, Fiene G, Hoecker U. 109.  2012. Arabidopsis COP1 and SPA genes are essential for plant elongation but not for acceleration of flowering time in response to a low red light to far-red light ratio. Plant Physiol. 160:2015–27 [Google Scholar]
  110. Salomon M, Zacherl M, Rudiger W. 110.  1997. Asymmetric, blue light-dependent phosphorylation of a 116-kilodalton plasma membrane protein can be correlated with the first- and second-positive phototropic curvature of oat coleoptiles. Plant Physiol. 115:485–91 [Google Scholar]
  111. Sheerin DJ, Menon C, zur Oven-Krockhaus S, Enderle B, Zhu L. 111.  et al. 2015. Light-activated phytochrome A and B interact with members of the SPA family to promote photomorphogenesis in Arabidopsis by reorganizing the COP1/SPA complex. Plant Cell 27:189–201 [Google Scholar]
  112. Shi H, Zhong S, Mo X, Liu N, Nezames CD, Deng XW. 112.  2013. HFR1 sequesters PIF1 to govern the transcriptional network underlying light-initiated seed germination in Arabidopsis. Plant Cell 25:3770–84 [Google Scholar]
  113. Shin J, Kim K, Kang H, Zulfugarov IS, Bae G. 113.  et al. 2009. Phytochromes promote seedling light responses by inhibiting four negatively-acting phytochrome-interacting factors. PNAS 106:7660–65 [Google Scholar]
  114. Shinomura T, Nagatani A, Hanzawa H, Kubota M, Watanabe M, Furuya M. 114.  1996. Action spectra for phytochrome A- and B-specific photoinduction of seed germination in Arabidopsis thaliana. PNAS 93:8129–33 [Google Scholar]
  115. Smalle J, Haegman M, Kurepa J, Van Montagu M, Van Der Straeten D. 115.  1997. Ethylene can stimulate Arabidopsis hypocotyl elongation in the light. PNAS 94:2756–61 [Google Scholar]
  116. Song YH, Smith RW, To BJ, Millar AJ, Imaizumi T. 116.  2012. FKF1 conveys timing information for CONSTANS stabilization in photoperiodic flowering. Science 336:1045–49 [Google Scholar]
  117. Srikanth A, Schmid M. 117.  2011. Regulation of flowering time: All roads lead to Rome. Cell. Mol. Life Sci. 68:2013–37 [Google Scholar]
  118. Steindler C, Matteucci A, Sessa G, Weimar T, Ohgishi M. 118.  et al. 1999. Shade avoidance responses are mediated by the ATHB-2 HD-Zip protein, a negative regulator of gene expression. Development 126:4235–45 [Google Scholar]
  119. Stephenson PG, Fankhauser C, Terry MJ. 119.  2009. PIF3 is a repressor of chloroplast development. PNAS 106:7654–59 [Google Scholar]
  120. Swarup R, Péret B. 120.  2012. AUX/LAX family of auxin influx carriers—an overview. Front. Plant Sci. 3:225 [Google Scholar]
  121. Takada S, Goto K. 121.  2003. TERMINAL FLOWER2, an Arabidopsis homolog of HETERO-CHROMATIN PROTEIN1, counteracts the activation of FLOWERING LOCUS T by CONSTANS in the vascular tissues of leaves to regulate flowering time. Plant Cell 15:2856–65 [Google Scholar]
  122. Tanaka S-I, Nakamura S, Mochizuki N, Nagatani A. 122.  2002. Phytochrome in cotyledons regulates the expression of genes in the hypocotyl through auxin-dependent and -independent pathways. Plant Cell Physiol. 43:1171–81 [Google Scholar]
  123. Tao Y, Ferrer J-L, Ljung K, Pojer F, Hong F. 123.  et al. 2008. Rapid synthesis of auxin via a new tryptophan-dependent pathway is required for shade avoidance in plants. Cell 133:164–76 [Google Scholar]
  124. Valverde F, Mouradov A, Soppe W, Ravenscroft D, Samach A, Coupland G. 124.  2004. Photoreceptor regulation of CONSTANS protein in photoperiodic flowering. Science 303:1003–6 [Google Scholar]
  125. Vandenbussche F, Tilbrook K, Fierro AC, Marchal K, Poelman D. 125.  et al. 2014. Photoreceptor-mediated bending towards UV-B in Arabidopsis. Mol. Plant 7:1041–52 [Google Scholar]
  126. Wang H, Wang H. 126.  2015. Phytochrome signaling: time to tighten up the loose ends. Mol. Plant 8:540–51 [Google Scholar]
  127. Wang Z-Y, Bai M-Y, Oh E, Zhu J-Y. 127.  2012. Brassinosteroid signaling network and regulation of photomorphogenesis. Annu. Rev. Genet. 46:701–24 [Google Scholar]
  128. Warnasooriya SN, Montgomery BL. 128.  2009. Detection of spatial-specific phytochrome responses using targeted expression of biliverdin reductase in Arabidopsis. Plant Physiol. 149:424–33 [Google Scholar]
  129. Weiner J. 129.  1985. Size hierarchies in experimental populations of annual plants. Ecology 66:743–52 [Google Scholar]
  130. Went FW, Thimann KW. 130.  1937. Phytohormones New York: Macmillan [Google Scholar]
  131. Willige BC, Ahlers S, Zourelidou M, Barbosa ICR, Demarsy E. 131.  et al. 2013. D6PK AGCVIII kinases are required for auxin transport and phototropic hypocotyl bending in Arabidopsis. Plant Cell 25:1674–88 [Google Scholar]
  132. Willige BC, Ghosh S, Nill C, Zourelidou M, Dohmann EMN. 132.  et al. 2007. The DELLA domain of GA INSENSITIVE mediates the interaction with the GA INSENSITIVE DWARF1A gibberellin receptor of Arabidopsis. Plant Cell 19:1209–20 [Google Scholar]
  133. Wilson RN, Heckman JW, Somerville CR. 133.  1992. Gibberellin is required for flowering in Arabidopsis thaliana under short days. Plant Physiol. 100:403–8 [Google Scholar]
  134. Wollenberg AC, Strasser B, Cerdán PD, Amasino RM. 134.  2008. Acceleration of flowering during shade avoidance in Arabidopsis alters the balance between FLOWERING LOCUS C-mediated repression and photoperiodic induction of flowering. Plant Physiol. 148:1681–94 [Google Scholar]
  135. Wu K, Li L, Gage DA, Zeevaart JA. 135.  1996. Molecular cloning and photoperiod-regulated expression of gibberellin 20-oxidase from the long-day plant spinach. Plant Physiol. 110:547–54 [Google Scholar]
  136. Xiong L, Zhu J-K. 136.  2003. Regulation of abscisic acid biosynthesis. Plant Physiol. 133:29–36 [Google Scholar]
  137. Xu YL, Gage DA, Zeevaart JA. 137.  1997. Gibberellins and stem growth in Arabidopsis thaliana. Effects of photoperiod on expression of the GA4 and GA5 loci. Plant Physiol. 114:1471–76 [Google Scholar]
  138. Xu Z-Y, Kim DH, Hwang I. 138.  2013. ABA homeostasis and signaling involving multiple subcellular compartments and multiple receptors. Plant Cell Rep. 32:807–13 [Google Scholar]
  139. Yamaguchi N, Winter CM, Wu M-F, Kanno Y, Yamaguchi A. 139.  et al. 2014. Gibberellin acts positively then negatively to control onset of flower formation in Arabidopsis. Science 344:638–41 [Google Scholar]
  140. Yamaguchi S. 140.  2008. Gibberellin metabolism and its regulation. Annu. Rev. Plant Biol. 59:225–51 [Google Scholar]
  141. Yamamoto K, Suzuki T, Aihara Y, Haga K, Sakai T, Nagatani A. 141.  2014. The phototropic response is locally regulated within the topmost light-responsive region of the Arabidopsis thaliana seedling. Plant Cell Physiol. 55:497–506 [Google Scholar]
  142. Yu S, Galvão VC, Zhang Y-C, Horrer D, Zhang T-Q. 142.  et al. 2012. Gibberellin regulates the Arabidopsis floral transition through miR156-targeted SQUAMOSA PROMOTER BINDING-LIKE transcription factors. Plant Cell 24:3320–32 [Google Scholar]
  143. Zazimalova E, Murphy AS, Yang H, Hoyerová K, Hosek P. 143.  2010. Auxin transporters—why so many?. Cold Spring Harb. Perspect. Biol. 2:a001552 [Google Scholar]
  144. Zhong S, Shi H, Xue C, Wang L, Xi Y. 144.  et al. 2012. A molecular framework of light-controlled phytohormone action in Arabidopsis. Curr. Biol. 22:1530–35Demonstrated a mechanism through which ET stimulates hypocotyl growth in the light and inhibits it in the dark. [Google Scholar]
  145. Zhong S, Shi H, Xue C, Wei N, Guo H, Deng XW. 145.  2014. Ethylene-orchestrated circuitry coordinates a seedling's response to soil cover and etiolated growth. PNAS 111:3913–20 [Google Scholar]
  146. Zhong S, Zhao M, Shi T, Shi H, An F. 146.  et al. 2009. EIN3/EIL1 cooperate with PIF1 to prevent photo-oxidation and to promote greening of Arabidopsis seedlings. PNAS 106:21431–36 [Google Scholar]
  147. Zhu L, Bu Q, Xu X, Paik I, Huang X. 147.  et al. 2015. CUL4 forms an E3 ligase with COP1 and SPA to promote light-induced degradation of PIF1. Nat. Commun. 6:7245 [Google Scholar]
  148. Zourelidou M, Absmanner B, Weller B, Barbosa ICR, Willige BC. 148.  et al. 2014. Auxin efflux by PIN-FORMED proteins is activated by two different protein kinases, D6 PROTEIN KINASE and PINOID. eLife 3:e02860 [Google Scholar]
  149. Zuo Z, Liu H, Liu B, Liu X, Lin C. 149.  2011. Blue light-dependent interaction of CRY2 with SPA1 regulates COP1 activity and floral initiation in Arabidopsis. Curr. Biol. 21:841–47 [Google Scholar]

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