scholarly journals Basic Protein Modules Combining Abscisic Acid and Light Signaling in Arabidopsis

2022 ◽  
Vol 12 ◽  
Author(s):  
Victor P. Bulgakov ◽  
Olga G. Koren
Keyword(s):  
Stem Cell ◽  
Abscisic Acid ◽  
Stem Elongation ◽  
Light Signal ◽  
Light Signaling ◽  
Shade Avoidance ◽  
Signaling System ◽  
Complex Signaling ◽  
Signaling Components ◽  
Protein Modules

It is generally accepted that plants use the complex signaling system regulated by light and abscisic acid (ABA) signaling components to optimize growth and development in different situations. The role of ABA–light interactions is evident in the coupling of stress defense reactions with seed germination and root development, maintaining of stem cell identity and stem cell specification, stem elongation and leaf development, flowering and fruit formation, senescence, and shade avoidance. All these processes are regulated jointly by the ABA–light signaling system. Although a lot of work has been devoted to ABA–light signal interactions, there is still no systematic description of central signaling components and protein modules, which jointly regulate plant development. New data have emerged to promote understanding of how ABA and light signals are integrated at the molecular level, representing an extensively growing area of research. This work is intended to fill existing gaps by using literature data combined with bioinformatics analysis.

scholarly journals Integration of light and hormone signaling pathways in the regulation of plant shade avoidance syndrome

aBIOTECH ◽  
2021 ◽  
Author(s):  
Yang Liu ◽  
Feresheeh Jafari ◽  
Haiyang Wang
Keyword(s):  
Signaling Pathways ◽  
Molecular Mechanisms ◽  
Stem Elongation ◽  
Molecular Genetic ◽  
Red Light ◽  
High Density ◽  
Light Signaling ◽  
Shade Avoidance ◽  
Hormone Signaling ◽  
Shade Avoidance Syndrome

AbstractAs sessile organisms, plants are unable to move or escape from their neighboring competitors under high-density planting conditions. Instead, they have evolved the ability to sense changes in light quantity and quality (such as a reduction in photoactive radiation and drop in red/far-red light ratios) and evoke a suite of adaptative responses (such as stem elongation, reduced branching, hyponastic leaf orientation, early flowering and accelerated senescence) collectively termed shade avoidance syndrome (SAS). Over the past few decades, much progress has been made in identifying the various photoreceptor systems and light signaling components implicated in regulating SAS, and in elucidating the underlying molecular mechanisms, based on extensive molecular genetic studies with the model dicotyledonous plant Arabidopsis thaliana. Moreover, an emerging synthesis of the field is that light signaling integrates with the signaling pathways of various phytohormones to coordinately regulate different aspects of SAS. In this review, we present a brief summary of the various cross-talks between light and hormone signaling in regulating SAS. We also present a perspective of manipulating SAS to tailor crop architecture for breeding high-density tolerant crop cultivars.

scholarly journals Does Green Really Mean Go? Increasing the Fraction of Green Photons Promotes Growth of Tomato but Not Lettuce or Cucumber

Plants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 637
Author(s):  
Paul Kusuma ◽  
Boston Swan ◽  
Bruce Bugbee
Keyword(s):  
Leaf Area ◽  
Stem Elongation ◽  
Wavelength Region ◽  
Sole Source ◽  
Dry Mass ◽  
Leaf Expansion ◽  
Photon Flux ◽  
Shade Avoidance ◽  
Crop Species ◽  
Blue Region

The photon flux in the green wavelength region is relatively enriched in shade and the photon flux in the blue region is selectively filtered. In sole source lighting environments, increasing the fraction of blue typically decreases stem elongation and leaf expansion, and smaller leaves reduce photon capture and yield. Photons in the green region reverse these blue reductions through the photoreceptor cryptochrome in Arabidopsis thaliana, but studies in other species have not consistently shown the benefits of photons in the green region on leaf expansion and growth. Spectral effects can interact with total photon flux. Here, we report the effect of the fraction of photons in the blue (10 to 30%) and green (0 to 50%) regions at photosynthetic photon flux densities of 200 and 500 µmol m−2 s−1 in lettuce, cucumber and tomato. As expected, increasing the fraction of photons in the blue region consistently decreased leaf area and dry mass. By contrast, large changes in the fraction of photons in the green region had minimal effects on leaf area and dry mass in lettuce and cucumber. Photons in the green region were more potent at a lower fraction of photons in the blue region. Photons in the green region increased stem and petiole length in cucumber and tomato, which is a classic shade avoidance response. These results suggest that high-light crop species might respond to the fraction of photons in the green region with either shade tolerance (leaf expansion) or shade avoidance (stem elongation).

scholarly journals GLP-1: Molecular mechanisms and outcomes of a complex signaling system

2019 ◽  
Vol 128 ◽  
pp. 94-105 ◽  
Author(s):  
Nicholas K. Smith ◽  
Troy A. Hackett ◽  
Aurelio Galli ◽  
Charles R. Flynn
Keyword(s):  
Molecular Mechanisms ◽  
Signaling System ◽  
Complex Signaling

scholarly journals The Arabidopsis ZINC FINGER PROTEIN3 Interferes with Abscisic Acid and Light Signaling in Seed Germination and Plant Development

2014 ◽  
Vol 165 (3) ◽  
pp. 1203-1220 ◽  
Author(s):  
Mary Prathiba Joseph ◽  
Csaba Papdi ◽  
László Kozma-Bognár ◽  
István Nagy ◽  
Marta López-Carbonell ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Seed Germination ◽  
Zinc Finger ◽  
Plant Development ◽  
Light Signaling

scholarly journals SHW1, a common regulator of abscisic acid (ABA) and light signaling pathways

2008 ◽  
Vol 3 (10) ◽  
pp. 862-864 ◽  
Author(s):  
Shikha Bhatia ◽  
Sreeramaiah N. Gangappa ◽  
Sudip Chattopadhyay
Keyword(s):  
Abscisic Acid ◽  
Signaling Pathways ◽  
Light Signaling ◽  
Common Regulator

scholarly journals DEG9, a serine protease, modulates cytokinin and light signaling by regulating the level of ARABIDOPSIS RESPONSE REGULATOR 4

2016 ◽  
Vol 113 (25) ◽  
pp. E3568-E3576 ◽  
Author(s):  
Wei Chi ◽  
Jing Li ◽  
Baoye He ◽  
Xin Chai ◽  
Xiumei Xu ◽  
...  
Keyword(s):  
Serine Protease ◽  
Response Regulator ◽  
Light Signaling ◽  
Plant Signaling ◽  
Response Regulators ◽  
Cytokinin Signaling ◽  
Periplasmic Proteins ◽  
The Stability ◽  
Protease Degradation ◽  
Signaling Components

Cytokinin is an essential phytohormone that controls various biological processes in plants. A number of response regulators are known to be important for cytokinin signal transduction. ARABIDOPSIS RESPONSE REGULATOR 4 (ARR4) mediates the cross-talk between light and cytokinin signaling through modulation of the activity of phytochrome B. However, the mechanism that regulates the activity and stability of ARR4 is unknown. Here we identify an ATP-independent serine protease, degradation of periplasmic proteins 9 (DEG9), which localizes to the nucleus and regulates the stability of ARR4. Biochemical evidence shows that DEG9 interacts with ARR4, thereby targeting ARR4 for degradation, which suggests that DEG9 regulates the stability of ARR4. Moreover, genetic evidence shows that DEG9 acts upstream of ARR4 and regulates the activity of ARR4 in cytokinin and light-signaling pathways. This study thus identifies a role for a ubiquitin-independent selective protein proteolysis in the regulation of the stability of plant signaling components.

Responses to shading in Chenopodium album: the effect of the maternal environment and the N source supplied

2004 ◽  
Vol 82 (9) ◽  
pp. 1371-1381 ◽  
Author(s):  
Humberto F Causin
Keyword(s):  
Stem Elongation ◽  
Chenopodium Album ◽  
Shade Avoidance ◽  
Ambient Light ◽  
Spectral Quality ◽  
Maternal Environment ◽  
Nutrient Treatment ◽  
N Source ◽  
Light Spectral Quality ◽  
N Acquisition

To study the effect of the maternal environment and N sources in responses to shading in Chenopodium album L., seeds from plants grown at an ambient red/far red (R/FR) ratio (1.07) or a low R/FR ratio (0.39) were germinated in a greenhouse at ambient light. At 34 d after sowing (d.a.s.), they were exposed to either ambient R/FR (0.98) or low R/FR (0.21) progeny light treatments and fertilized with 2.7 mmol/L nitrogen supplied at 1:3 or 3:1 NO3– : NH4+ ratios. Two harvests were performed at 67 and 113 d.a.s. At each harvest, stem elongation traits and biomass of plant organs were recorded. In the first harvest, tissue N% and free NO3–-N concentrations were analyzed. In the first harvest, plants from the low R/FR maternal treatment were heavier and taller than the maternal controls when grown at an ambient R/FR and with a high NO3– supply. At the second harvest this difference persisted in most of the conditions tested. Stem elongation and relative biomass allocation to the stem increased in the low R/FR treated plants, although the effect varied during ontogeny and with the maternal and nutrient treatment considered. The studied factors also affected N acquisition and metabolism. It is concluded that responses to the light spectral quality as well as plant N economy are influenced by the R/FR ratio of the maternal environment and that their expression may be altered by the relative availability of NO3–-N and NH4+-N.Key words: ammonium, Chenopodium album, light spectral quality, maternal effects, nitrate, shade-avoidance responses.

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