Integration of Light and Photoperiodic Signaling in Transcriptional Nuclear Foci

Kaiserli, Eirini; Páldi, Katalin; O’Donnell, Liz; Batalov, Olga; Pedmale, Ullas V.; Nusinow, Dmitri A.; Kay, Steve A.; Chory, Joanne

doi:10.1016/j.devcel.2015.10.008

Cited by 78 publications

(128 citation statements)

References 65 publications

(91 reference statements)

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“…Reaching the soil surface and the light, the young seedling has to establish a photoautotrophic lifestyle. The light is perceived by several classes of photoreceptors, which induce a signaling cascade toward photomorphogenic development (Box 1; Galvão and Fankhauser, 2015;Chen et al, 2010;Kaiserli et al, 2015;Huang et al, 2016b;Leivar and Monte, 2014;Ni et al, 2014;Pedmale et al, 2016;Dong et al, 2017;Ni et al, 2017;Pham et al, 2017;Bae and Choi, 2008;Leivar et al, 2008;Hoecker, 2017;Osterlund et al, 2000;Dong et al, 2014) that leads to extreme, organ-specific developmental changes that require local promotion (cotyledons, roots) and inhibition (hypocotyl) of growth ( Fig. 1).…”

Section: Out Of the Dark And Into The Light: Switching The Balance Frmentioning

confidence: 99%

Seedling Establishment: A Dimmer Switch-Regulated Process between Dark and Light Signaling

2017

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Section: Out Of the Dark And Into The Light: Switching The Balance Frmentioning

confidence: 99%

Seedling Establishment: A Dimmer Switch-Regulated Process between Dark and Light Signaling

2017

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“…The ISU gene encoding an Fe-S scaffolding protein (Kaiserli et al, 2015) served as an internal control.…”

Section: Gene Expression Analysismentioning

confidence: 99%

Unexpected Connections between Humidity and Ion Transport Discovered Using a Model to Bridge Guard Cell-to-Leaf Scales

et al. 2017

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Stomatal movements depend on the transport and metabolism of osmotic solutes that drive reversible changes in guard cell volume and turgor. These processes are defined by a deep knowledge of the identities of the key transporters and of their biophysical and regulatory properties, and have been modeled successfully with quantitative kinetic detail at the cellular level. Transpiration of the leaf and canopy, by contrast, is described by quasilinear, empirical relations for the inputs of atmospheric humidity, CO 2 , and light, but without connection to guard cell mechanics. Until now, no framework has been available to bridge this gap and provide an understanding of their connections. Here, we introduce OnGuard2, a quantitative systems platform that utilizes the molecular mechanics of ion transport, metabolism, and signaling of the guard cell to define the water relations and transpiration of the leaf. We show that OnGuard2 faithfully reproduces the kinetics of stomatal conductance in Arabidopsis thaliana and its dependence on vapor pressure difference (VPD) and on water feed to the leaf. OnGuard2 also predicted with VPD unexpected alterations in K + channel activities and changes in stomatal conductance of the slac1 Cl 2 channel and ost2 H + -ATPase mutants, which we verified experimentally. OnGuard2 thus bridges the micro-macro divide, offering a powerful tool with which to explore the links between guard cell homeostasis, stomatal dynamics, and foliar transpiration. INTRODUCTIONStomata provide the main pathway for CO 2 entry for photosynthesis and for transpirational water loss across the leaf epidermis. Pairs of guard cells surround each stoma, regulating the aperture to balance the often conflicting demands for CO 2 and for water conservation. Guard cells open and close the pore, driven by osmotic solute uptake and loss, notably of K + and Cl 2 , and by the synthesis and metabolism of organic solutes, especially sucrose (Suc) and malate (Mal) (Willmer and Fricker, 1996;Kim et al., 2010;Roelfsema and Hedrich, 2010;Lawson and Blatt, 2014;Jezek and Blatt, 2017). A number of well-defined signals, including light, CO 2 , and the water stress hormone abscisic acid (ABA), modulate transport and solute accumulation to alter cell volume, turgor, and stomatal aperture. Much research at the cellular level has focused on these inputs and their connection to stomatal movements, especially stomatal closing. Studies have highlighted both Ca 2+ -independent and Ca 2+ -dependent signaling, including elevated free cytosolic Ca 2+ concentration ([Ca 2+ ] i ), cytosolic pH (pH i ), protein kinases, and phosphatases, that inactivate inward-rectifying K + channels and activate Cl 2 channels and outward-rectifying K + channels to bias the membrane for solute loss (Blatt et al., 1990;Lemtiri-Chlieh and MacRobbie, 1994; Blatt, 1998, 1999;Marten et al., 2007;Assmann and Jegla, 2016;Jezek and Blatt, 2017).At the tissue and whole-plant levels, by contrast, attention has been drawn to inputs closely tied to photosynthesis, including tra...

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“…As GI is well known as an activator of FT (Suárez-López et al, 2001;Jung et al, 2007;Sawa and Kay, 2011), both of these could constitute mechanisms by which the EC could regulate FT and flowering time. In addition, although it is clear that participation in the EC is a key role for ELF3, ELF4, and LUX proteins, it also seems likely that the individual functions of ELF3 and ELF4 are not limited to this, as they have been reported to interact independently with other circadian clock, photoperiod pathway, and light signaling components (Liu et al, 2001;Kim et al, 2013;Kaiserli et al, 2015;Nieto et al, 2015).…”

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confidence: 99%

EARLY FLOWERING3 Redundancy Fine-Tunes Photoperiod Sensitivity

et al. 2017

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Three pea (Pisum sativum) loci controlling photoperiod sensitivity, HIGH RESPONSE (HR), DIE NEUTRALIS (DNE), and STERILE NODES (SN), have recently been shown to correspond to orthologs of Arabidopsis (Arabidopsis thaliana) circadian clock genes EARLY FLOWERING3 (ELF3), ELF4, and LUX ARRHYTHMO, respectively. A fourth pea locus, PHOTOPERIOD (PPD), also contributes to the photoperiod response in a similar manner to SN and DNE, and recessive ppd mutants on a springflowering hr mutant background show early, photoperiod-insensitive flowering. However, the molecular identity of PPD has so far remained elusive. Here, we show that the PPD locus also has a role in maintenance of diurnal and circadian gene expression rhythms and identify PPD as an ELF3 co-ortholog, termed ELF3b. Genetic interactions between pea ELF3 genes suggest that loss of PPD function does not affect flowering time in the presence of functional HR, whereas PPD can compensate only partially for the lack of HR. These results provide an illustration of how gene duplication and divergence can generate potential for the emergence of more subtle variations in phenotype that may be adaptively significant.

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Integration of Light and Photoperiodic Signaling in Transcriptional Nuclear Foci

Cited by 78 publications

References 65 publications

Seedling Establishment: A Dimmer Switch-Regulated Process between Dark and Light Signaling

Seedling Establishment: A Dimmer Switch-Regulated Process between Dark and Light Signaling

Unexpected Connections between Humidity and Ion Transport Discovered Using a Model to Bridge Guard Cell-to-Leaf Scales

EARLY FLOWERING3 Redundancy Fine-Tunes Photoperiod Sensitivity

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