scholarly journals Light-induced HY5 Functions as a Systemic Signal to Coordinate the Photoprotective Response to Light Fluctuation

2020 ◽  
Vol 184 (2) ◽  
pp. 1181-1193
Author(s):  
Xiaochun Jiang ◽  
Jin Xu ◽  
Rui Lin ◽  
Jianing Song ◽  
Shujun Shao ◽  
...  
Keyword(s):  
Systemic Signal ◽  
Light Fluctuation

scholarly journals Disruption of CYCLOPHILIN 38 Function Reveals a Photosynthesis-Dependent Systemic Signal Controlling Lateral Root Emergence

2020 ◽  
Author(s):  
Lina Duan ◽  
Juan Manuel Pérez-Ruiz ◽  
Francisco Javier Cejudo ◽  
Jose R. Dinneny
Keyword(s):  
Lateral Root ◽  
Systemic Signal

In-line measurement of particle size and concentration with light fluctuation method

2004 ◽  
Vol 2 (2) ◽  
pp. 89-91 ◽  
Author(s):  
Xiaoshu Cai ◽  
Junfeng Li ◽  
Xin Ouyang ◽  
Zhijun Zhao
Keyword(s):  
Particle Size ◽  
Line Measurement ◽  
Fluctuation Method ◽  
Light Fluctuation

Activation of elicitor defensive properties by systemic signal molecules during the interaction between potato and the late blight agent

2008 ◽  
Vol 44 (2) ◽  
pp. 213-217 ◽  
Author(s):  
N. I. Vasyukova ◽  
G. I. Chalenko ◽  
N. G. Gerasimova ◽  
T. A. Valueva ◽  
O. L. Ozeretskovskaya
Keyword(s):  
Late Blight ◽  
Signal Molecules ◽  
Systemic Signal

scholarly journals Determining the Relationship Between Salicylic Acid Levels and Systemic Acquired Resistance Induction in Tobacco

1998 ◽  
Vol 11 (8) ◽  
pp. 795-800 ◽  
Author(s):  
Michael G. Willits ◽  
John A. Ryals
Keyword(s):  
Salicylic Acid ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Wild Type ◽  
Tobacco Plants ◽  
Previous Conclusion ◽  
Resistance Induction ◽  
Systemic Signal ◽  
The Relationship

Salicylic acid (SA) has been proposed as the systemic signal for the induction of systemic acquired resistance (SAR). It has been suggested that SA is synthesized at the site of pathogen-induced necrosis and is translocated to induce SAR in uninfected leaves. Grafting studies between wild-type tobacco plants and plants that are unable to accumulate significant amounts of SA have shown that the large increase in SA accumulation seen in inoculated leaves is not necessary for SAR induction, suggesting that SA is not the primary systemic signal. However, these studies have not addressed whether decreased levels of SA accumulation in inoculated leaves are sufficient to fully induce SAR. In this study, we have determined the relationship between free SA levels in the inoculated leaf and SAR induction in tobacco. These results support our previous conclusion that SA is not likely to be the systemic signal.

Legume nodulation: successful symbiosis through short- and long-distance signalling

2006 ◽  
Vol 33 (8) ◽  
pp. 707 ◽  
Author(s):  
Mark Kinkema ◽  
Paul T. Scott ◽  
Peter M. Gresshoff
Keyword(s):  
Molecular Genetic ◽  
Signal Transduction Pathway ◽  
Molecular Genetic Analysis ◽  
Long Distance ◽  
Symbiotic Interaction ◽  
Available Nitrogen ◽  
Autoregulation Of Nodulation ◽  
Systemic Signal ◽  
Review Reports ◽  
Level Of Understanding

Nodulation in legumes provides a major conduit of available nitrogen into the biosphere. The development of nitrogen-fixing nodules results from a symbiotic interaction between soil bacteria, commonly called rhizobia, and legume plants. Molecular genetic analysis in both model and agriculturally important legume species has resulted in the identification of a variety of genes that are essential for the establishment, maintenance and regulation of this symbiosis. Autoregulation of nodulation (AON) is a major internal process by which nodule numbers are controlled through prior nodulation events. Characterisation of AON-deficient mutants has revealed a novel systemic signal transduction pathway controlled by a receptor-like kinase. This review reports our present level of understanding on the short- and long-distance signalling networks controlling early nodulation events and AON.

Phosphate Requirement, Photosynthesis, and Diel Cell Cycle of Scenedesmus obliquas Under Fluctuating Light

1987 ◽  
Vol 44 (10) ◽  
pp. 1753-1758 ◽  
Author(s):  
C. N. Shin ◽  
G-Y Rhee ◽  
J. Chen
Keyword(s):  
Steady State ◽  
Average Rate ◽  
Scenedesmus Obliquus ◽  
Constant Light ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Cell Numbers ◽  
P Limitation ◽  
Fluctuating Light ◽  
Light Fluctuation

The effect of light fluctuation (0.06 Hz) on P requirement, photosynthesis, and the diel cell-division cycle was investigated in Scenedesmus obliquus in a chemostat under a 12 h day: 12 h night cycle. P requirement was much less under oscillating than under constant daylight of the same photon flux density. However, cell chlorophyll a was significantly higher, indicating an increased N requirement. There was little difference in photosynthetic efficiency (the slope of the photosynthesis–light regression) between oscillating and constant light, but photosynthetic capacity was higher in fluctuating light. Cell C was also higher. A strong diel rhythmicity in steady-state cell numbers was observed with little phase difference between oscillating and constant light. Although steady-state cell numbers under P limitation were significantly higher under fluctuating light, there was no difference in instantaneous growth rates and their diel distribution. At a dilution rate of 0.6∙d−1, cell death occurred at an average rate of −0.56∙d−1 between 4 h before and 5 h after the onset of the dark period.

scholarly journals Extracellular ATP plays an important role in systemic wound response activation

2022 ◽  
Author(s):  
Ronald Myers ◽  
Yosef Fichman ◽  
Gary Stacey ◽  
Ron Mittler
Keyword(s):  
Signaling Pathways ◽  
Extracellular Atp ◽  
Wound Response ◽  
Mechanical Wounding ◽  
Long Distance ◽  
Wound Responses ◽  
Systemic Signal ◽  
Electric Signals ◽  
Multiple Signaling

Mechanical wounding occurs in plants during biotic (e.g., herbivore or pathogen attack) or abiotic (e.g., wind damage or freezing) stresses and is associated with the activation of multiple signaling pathways. These initiate many wound responses at the wounded tissues, as well as trigger long-distance signaling pathways that activate wound responses in tissues that were not affected by the initial wounding event (termed systemic wound response). Among the different systemic signals activated by wounding are electric signals, calcium and reactive oxygen species (ROS) waves, and different plant hormones such as jasmonic acid. The release of glutamate from cells at the wounded tissues was recently proposed to trigger several different systemic signal transduction pathways via glutamate-like receptors (GLRs). However, the role of another important compound released from cells during wounding (i.e., extracellular ATP; eATP) in triggering systemic responses is not clear. Here we show that eATP that accumulates in wounded leaves and is sensed by the purinoreceptor kinase P2K is required for the activation of the ROS wave during wounding. Application of eATP to unwounded leaves triggered the ROS wave, and the activation of the ROS wave by wounding or eATP application was suppressed in mutants deficient in P2K (i.e., p2k1-3, p2k2, and p2k1-3p2k2). In addition, the expression of several systemic wound response transcripts was suppressed in mutants deficient in P2K during wounding. Our findings reveal that in addition to sensing glutamate via GLRs, eATP sensed by P2Ks is playing a key role in the triggering of systemic wound responses in plants.

scholarly journals FMO1 Is Involved in Excess Light Stress-Induced Signal Transduction and Cell Death Signaling

Cells ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 2163 ◽  
Author(s):  
Weronika Czarnocka ◽  
Yosef Fichman ◽  
Maciej Bernacki ◽  
Elżbieta Różańska ◽  
Izabela Sańko-Sawczenko ◽  
...  
Keyword(s):  
Cell Death ◽  
Signaling Pathways ◽  
Systemic Acquired Resistance ◽  
Light Stress ◽  
Acquired Resistance ◽  
Defense Responses ◽  
Cellular Mechanisms ◽  
Systemic Signal ◽  
Excess Light ◽  
Induced Signal

Because of their sessile nature, plants evolved integrated defense and acclimation mechanisms to simultaneously cope with adverse biotic and abiotic conditions. Among these are systemic acquired resistance (SAR) and systemic acquired acclimation (SAA). Growing evidence suggests that SAR and SAA activate similar cellular mechanisms and employ common signaling pathways for the induction of acclimatory and defense responses. It is therefore possible to consider these processes together, rather than separately, as a common systemic acquired acclimation and resistance (SAAR) mechanism. Arabidopsis thaliana flavin-dependent monooxygenase 1 (FMO1) was previously described as a regulator of plant resistance in response to pathogens as an important component of SAR. In the current study, we investigated its role in SAA, induced by a partial exposure of Arabidopsis rosette to local excess light stress. We demonstrate here that FMO1 expression is induced in leaves directly exposed to excess light stress as well as in systemic leaves remaining in low light. We also show that FMO1 is required for the systemic induction of ASCORBATE PEROXIDASE 2 (APX2) and ZINC-FINGER OF ARABIDOPSIS 10 (ZAT10) expression and spread of the reactive oxygen species (ROS) systemic signal in response to a local application of excess light treatment. Additionally, our results demonstrate that FMO1 is involved in the regulation of excess light-triggered systemic cell death, which is under control of LESION SIMULATING DISEASE 1 (LSD1). Our study indicates therefore that FMO1 plays an important role in triggering SAA response, supporting the hypothesis that SAA and SAR are tightly connected and use the same signaling pathways.

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