scholarly journals Possible compensatory role among chloroplast proteases under excess-light stress condition

2013 ◽  
Vol 8 (3) ◽  
pp. e23198 ◽  
Author(s):  
Yusuke Kato ◽  
Wataru Sakamoto
Keyword(s):  
Stress Condition ◽  
Light Stress ◽  
Excess Light

Photosynthetic Electron Transport Regulates the Expression of Cytosolic Ascorbate Peroxidase Genes in Arabidopsis during Excess Light Stress

1997 ◽  
Vol 9 (4) ◽  
pp. 627 ◽  
Author(s):  
Stanislaw Karpinski ◽  
Carolina Escobar ◽  
Barbara Karpinska ◽  
Gary Creissen ◽  
Philip M. Mullineaux
Keyword(s):  
Electron Transport ◽  
Ascorbate Peroxidase ◽  
Light Stress ◽  
Photosynthetic Electron Transport ◽  
Cytosolic Ascorbate Peroxidase ◽  
Excess Light

scholarly journals Role of hydrogen peroxide and the redox state of ascorbate in the induction of antioxidant enzymes in pea leaves under excess light stress

2004 ◽  
Vol 31 (4) ◽  
pp. 359 ◽  
Author(s):  
Jose A. Hernández ◽  
Carolina Escobar ◽  
Gary Creissen ◽  
Phil M. Mullineaux
Keyword(s):  
Antioxidant Enzymes ◽  
Redox State ◽  
Light Stress ◽  
Redox Status ◽  
Protein Accumulation ◽  
Photoinhibition Of Photosynthesis ◽  
Transcript Accumulation ◽  
Land Race ◽  
Excess Light

In this work we used two different pea cultivars, JI281 is a semidomesticated land race of pea from Ethiopia whereas JI399 is a typical domesticated pea variety. Exposure of pea leaves to excess light (EL) for 1 h caused a reversible photoinhibition of photosynthesis as showed by changes in Fv / Fm. Although little difference existed between the two pea genotypes with respect to photoinhibition, after 60 min of EL the decline in Fv / Fm was higher in JI281 than in JI399 leaves. As a consequence of EL, H2O2 increased in both pea cultivars, whereas lipid peroxidation and protein oxidation slightly increased, although differences between cultivars were minimal. The redox state of ascorbate shifted towards its oxidized form under EL stress in both cultivars. Transcript levels of genes coding antioxidant enzymes varied with EL in both cultivars, but the response was more pronounced in JI399. The induction observed during EL was maintained or increased after the stress period, as occurred for cytGR and chlMDHAR. GR protein accumulation and activity correlated with the transcript accumulation in JI399, but not in JI288. In this work, a possible role for H2O2 and redox status of ascorbate in the photoxidative stress signalling is discussed.

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.

scholarly journals The molecular pH-response mechanism of the plant light-stress sensor PsbS

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Maithili Krishnan-Schmieden ◽  
Patrick E. Konold ◽  
John T. M. Kennis ◽  
Anjali Pandit
Keyword(s):  
Protein Interactions ◽  
Physcomitrella Patens ◽  
Light Stress ◽  
Ph Sensor ◽  
Low Ph ◽  
Molecular Response ◽  
Response Mechanism ◽  
Ph Response ◽  
Excess Light ◽  
Shared Motif

AbstractPlants need to protect themselves from excess light, which causes photo-oxidative damage and lowers the efficiency of photosynthesis. Photosystem II subunit S (PsbS) is a pH sensor protein that plays a crucial role in plant photoprotection by detecting thylakoid lumen acidification in excess light conditions via two lumen-faced glutamates. However, how PsbS is activated under low-pH conditions is unknown. To reveal the molecular response of PsbS to low pH, here we perform an NMR, FTIR and 2DIR spectroscopic analysis of Physcomitrella patens PsbS and of the E176Q mutant in which an active glutamate has been replaced. The PsbS response mechanism at low pH involves the concerted action of repositioning of a short amphipathic helix containing E176 facing the lumen and folding of the luminal loop fragment adjacent to E71 to a 310-helix, providing clear evidence of a conformational pH switch. We propose that this concerted mechanism is a shared motif of proteins of the light-harvesting family that may control thylakoid inter-protein interactions driving photoregulatory responses.

scholarly journals Rapid Recovery Gene Downregulation during Excess-Light Stress and Recovery in Arabidopsis

2017 ◽  
Vol 29 (8) ◽  
pp. 1836-1863 ◽  
Author(s):  
Peter A. Crisp ◽  
Diep R. Ganguly ◽  
Aaron B. Smith ◽  
Kevin D. Murray ◽  
Gonzalo M. Estavillo ◽  
...  
Keyword(s):  
Light Stress ◽  
Rapid Recovery ◽  
Excess Light
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