Low Blue Light Enhances Phototropism by Releasing Cryptochrome1-Mediated Inhibition of <i>PIF4</i> Expression

Boccaccini, Alessandra; Legris, Martina; Krahmer, Johanna; Petrolati, Laure Allenbach; Goyal, Anupama; Galván‐Ampudia, Carlos; Vernoux, Teva; Karayekov, Elizabeth; Casal, Jorge J.; Fankhauser, Christian

doi:10.1104/pp.20.00243

Cited by 37 publications

(34 citation statements)

References 66 publications

(128 reference statements)

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“…2 Active photoreceptors trigger Phytochrome Interacting Factor (PIF) phosphorylation, which leads to degradation for PIF4 and PIF5 and inactivation for PIF7 [9]. 3 Free PIFs bind to promotors of YUCCAs, HFR1 and many other target genes and stimulate their expression [10][11][12][13][14][15][16][17][18]. HFR1, which is stabilised in UV-B via UVR8, inhibits DNA binding of PIFs [19].…”

Section: Photoreceptors To Sense Temperature and Light Quality Quantmentioning

confidence: 99%

“…While PIF7 plays a major role in low R:FR-mediated hypocotyl elongation through stimulating auxin synthesis, with additional roles for PIF4 and PIF5, it is less strictly required for hypocotyl elongation in low B [55,60]. However, cryptochrome inactivation has recently been shown to affect hypocotyl phototropism towards blue light via PIF4, PIF5 and PIF7 and YUCCA-mediated auxin synthesis [10].…”

Section: Cryptochromesmentioning

confidence: 99%

“…Dephosphorylated NPH3 dissociates from the phot1 membrane complex to form cytosolic aggregates which occur most strongly in the illuminated side of the hypocotyl [42]. This NPH3 dephosphorylation asymmetry is mirrored by auxin reporters [10,43,44,46]. Asymmetric auxin concentrations allow for phototropic hypocotyl bending through auxin-mediated cell elongation on the shaded side of the hypocotyl [62].…”

Section: Phototropinsmentioning

confidence: 99%

“…Hypocotyl phototropism towards unilateral blue light is the result of enhanced auxin signalling on the shaded side of the hypocotyl [10,43,44,46,88]. The observed auxin asymmetry is reduced in pin3 and phot1 mutants [43], and PIN1, PIN3, PIN4 and PIN7 are all required for normal phototropic bending [47,89].…”

Section: Photoreceptor Control Of Auxin Transportmentioning

confidence: 99%

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Photoreceptors Regulate Plant Developmental Plasticity through Auxin

Küpers

Oskam

Pierik

2020

Plants

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Light absorption by plants changes the composition of light inside vegetation. Blue (B) and red (R) light are used for photosynthesis whereas far-red (FR) and green light are reflected. A combination of UV-B, blue and R:FR-responsive photoreceptors collectively measures the light and temperature environment and adjusts plant development accordingly. This developmental plasticity to photoreceptor signals is largely regulated through the phytohormone auxin. The phytochrome, cryptochrome and UV Resistance Locus 8 (UVR8) photoreceptors are inactivated in shade and/or elevated temperature, which releases their repression of Phytochrome Interacting Factor (PIF) transcription factors. Active PIFs stimulate auxin synthesis and reinforce auxin signalling responses through direct interaction with Auxin Response Factors (ARFs). It was recently discovered that shade-induced hypocotyl elongation and petiole hyponasty depend on long-distance auxin transport towards target cells from the cotyledon and leaf tip, respectively. Other responses, such as phototropic bending, are regulated by auxin transport and signalling across only a few cell layers. In addition, photoreceptors can directly interact with components in the auxin signalling pathway, such as Auxin/Indole Acetic Acids (AUX/IAAs) and ARFs. Here we will discuss the complex interactions between photoreceptor and auxin signalling, addressing both mechanisms and consequences of these highly interconnected pathways.

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Section: Photoreceptors To Sense Temperature and Light Quality Quantmentioning

confidence: 99%

Section: Cryptochromesmentioning

confidence: 99%

Section: Phototropinsmentioning

confidence: 99%

Section: Photoreceptor Control Of Auxin Transportmentioning

confidence: 99%

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Photoreceptors Regulate Plant Developmental Plasticity through Auxin

Küpers

Oskam

Pierik

2020

Plants

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“…In nature, different canopy conditions combine changes in light spectral quality 50 . The red: far red and blue levels of daylight decreases as it passes through the vegetative canopy 80 , 81 . In our study, the expression levels of PpPRR5 and PpFKF1 were up-regulated in SP system with mutual shading characteristics.…”

Section: Discussionmentioning

confidence: 99%

Comparative physiological and transcriptomic analysis of pear leaves under distinct training systems

Liu

Lin

et al. 2020

Sci Rep

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Canopy architecture is critical in determining the light interception and distribution, and subsequently the photosynthetic efficiency and productivity. However, the physiological responses and molecular mechanisms by which pear canopy architectural traits impact on photosynthesis remain poorly understood. Here, physiological investigations coupled with comparative transcriptomic analyses were performed in pear leaves under distinct training systems. Compared with traditional freestanding system, flat-type trellis system (DP) showed higher net photosynthetic rate (PN) levels at the most time points throughout the entire monitored period, especially for the interior of the canopy in sunny side. Gene ontology analysis revealed that photosynthesis, carbohydrate derivative catabolic process and fatty acid metabolic process were over-represented in leaves of DP system with open-canopy characteristics. Weighted gene co-expression network analysis uncovered a significant network module positive correlated with PN value. The hub genes (PpFKF1 and PpPRR5) of the module were enriched in circadian rhythm pathway, suggesting a functional role for circadian clock genes in mediating photosynthetic performance under distinct training systems. These results draw a link between pear photosynthetic response and specific canopy architectural traits, and highlight light harvesting and circadian clock network as potential targets for the input signals from the fluctuating light availability under distinct training systems.

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