scholarly journals Remarkable anoxia tolerance by stoneflies from a floodplain aquifer

Ecology ◽  
2020 ◽  
Vol 101 (10) ◽  
Author(s):  
Rachel L. Malison ◽  
Bonnie K. Ellis ◽  
Amanda G. DelVecchia ◽  
Hailey Jacobson ◽  
Brian K. Hand ◽  
...  
Keyword(s):  
Anoxia Tolerance

Anoxia tolerance and α-amylase activity in four rice cultivars

2008 ◽  
Vol 55 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Hisashi Kato-Noguchi ◽  
Ryosuke Sasaki ◽  
Yukihiro Yasuda
Keyword(s):  
Amylase Activity ◽  
Anoxia Tolerance ◽  
Rice Cultivars

Anoxia Tolerance in a Root Hair Defective Mutant of Rice

2004 ◽  
Vol 51 (1) ◽  
pp. 116-119
Author(s):  
H. Kato-Noguchi ◽  
R. Sasaki ◽  
M. Ichii
Keyword(s):  
Root Hair ◽  
Anoxia Tolerance ◽  
Defective Mutant

Anoxia tolerance in rice roots acclimated by several different periods of hypoxia

2003 ◽  
Vol 160 (5) ◽  
pp. 565-568
Author(s):  
Hisashi Kato-Noguchi
Keyword(s):  
Anoxia Tolerance ◽  
Rice Roots

Molecular mechanisms of turtle anoxia tolerance: A role for NF-κB

Gene ◽  
2010 ◽  
Vol 450 (1-2) ◽  
pp. 63-69 ◽  
Author(s):  
Anastasia Krivoruchko ◽  
Kenneth B. Storey
Keyword(s):  
Molecular Mechanisms ◽  
Anoxia Tolerance

scholarly journals Extreme anoxia tolerance in embryos of the annual killifish Austrofundulus limnaeus: insights from a metabolomics analysis

2007 ◽  
Vol 210 (13) ◽  
pp. 2253-2266 ◽  
Author(s):  
J. E. Podrabsky ◽  
J. P. Lopez ◽  
T. W. M. Fan ◽  
R. Higashi ◽  
G. N. Somero
Keyword(s):  
Anoxia Tolerance ◽  
Annual Killifish ◽  
Austrofundulus Limnaeus ◽  
Metabolomics Analysis

Cerebral anoxia tolerance in turtles: regulation of intracellular calcium and pH

1992 ◽  
Vol 263 (6) ◽  
pp. R1298-R1302
Author(s):  
P. E. Bickler
Keyword(s):  
Intracellular Calcium ◽  
Brain Slices ◽  
Calcium Flux ◽  
Anoxia Tolerance ◽  
Acetoxymethyl Ester ◽  
Fluorescent Indicators ◽  
Cerebral Anoxia ◽  
Atp Production ◽  
Laboratory Rats ◽  
Inhibition Of Glycolysis

To investigate mechanisms of cerebral anoxia tolerance, cerebrocortical intracellular calcium ([Ca2+]i) and pH (pHi) regulation were compared in turtles (Trachemys scripta) and laboratory rats. [Ca2+]i and pHi in living 200 to 300-microns-thick cortical brain slices were measured with the fluorescent indicators fura-2/acetoxymethyl ester (AM) and 2',7'-bis(carboxyethyl)-5(6)-carboxyfluorescein during exposure to anoxia. Within 5 min, [Ca2+]i increased to > 1,000 nM in rat brain slices exposed to anoxia but [Ca2+]i was normal even after 5 h of anoxia in turtles. ATP levels remained normal in anoxic turtle brain but fell rapidly in rats. During anoxia, pHi fell by 0.25 +/- 0.08 pH units in rats but only 0.10 +/- 0.04 in turtles (P < 0.05). Inhibition of glycolysis in anoxic turtle brain with iodoacetate resulted in large increases in [Ca2+]i but prior exposure of slices to anoxia resulted in greatly attenuated calcium entry. The reduction in calcium flux was greater with increasing exposure to anoxia, suggesting progressive arrest of calcium channel activity. Tolerance of cerebral anoxia in turtles may be related to anaerobic ATP production, arrest of calcium channels, and attenuation of changes in pHi.

scholarly journals Navigating oxygen deprivation: liver transcriptomic responses of the red eared slider turtle to environmental anoxia

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e8144 ◽  
Author(s):  
Kyle K. Biggar ◽  
Jing Zhang ◽  
Kenneth B. Storey
Keyword(s):  
Lactate Production ◽  
Metabolic Reprogramming ◽  
Anoxia Tolerance ◽  
Molecular Processes ◽  
Painted Turtles ◽  
Slider Turtle ◽  
Damage Repair ◽  
Transcriptomic Responses ◽  
Molecular Landscape ◽  
Transcriptomic Changes

The best facultative anaerobes among vertebrates are members of the genera Trachemys (pond slider turtles) and Chrysemys (painted turtles), and are able to survive without oxygen for up to 12 to 18 weeks at ∼3 °C. In this study, we utilized RNAseq to profile the transcriptomic changes that take place in response to 20 hrs of anoxia at 5 °C in the liver of the red eared slide turtle (Trachemys scripta elegans). Sequencing reads were obtained from at least 18,169 different genes and represented a minimum 49x coverage of the C. picta bellii exome. A total of 3,105 genes showed statistically significant changes in gene expression between the two animal groups, of which 971 also exhibited a fold change equal to or greater than 50% of control normoxic values. This study also highlights a number of anoxia-responsive molecular pathways that are may be important to navigating anoxia survival. These pathways were enriched in mRNA found to significantly increase in response to anoxia and included molecular processes such as DNA damage repair and metabolic reprogramming. For example, our results indicate that the anoxic turtle may utilize succinate metabolism to yield a molecule of GTP in addition to the two molecules that results from lactate production, and agrees with other established models of anoxia tolerance. Collectively, our analysis provides a snapshot of the molecular landscape of the anoxic turtle and may provide hints into the how this animal is capable of surviving this extreme environmental stress.

Long-Term Anoxia Tolerance in Flowering Plants

2011 ◽  
pp. 219-246 ◽  
Author(s):  
Robert M. M. Crawford
Keyword(s):  
Flowering Plants ◽  
Anoxia Tolerance

Slow ATP loss and the defense of ion homeostasis in the anoxic frog brain

2001 ◽  
Vol 204 (20) ◽  
pp. 3547-3551
Author(s):  
Debra L. Knickerbocker ◽  
Peter L. Lutz
Keyword(s):  
Initial Phase ◽  
Ion Homeostasis ◽  
Atp Depletion ◽  
Neuronal Membrane ◽  
Anoxia Tolerance ◽  
Frog Brain ◽  
Atp Levels ◽  
Anoxic Depolarization ◽  
Rate Of Increase ◽  
The Brain

SUMMARY For most vertebrates, cutting off the oxygen supply to the brain results in a rapid (within minutes) loss of ATP, the failure of ATP-dependent ion-transport process, subsequent anoxic depolarization of neuronal membrane potential and consequential neuronal death. The few species that survive brain anoxia for days or months, such as the freshwater turtle Trachemys scripta, avoid anoxic depolarization and maintain brain ATP levels through a coordinated downregulation of brain energy demand processes. The frog Rana pipiens represents an intermediate in anoxia-tolerance, being able to survive brain anoxia for hours. However, the anoxic frog brain does not defend its energy stores. Instead, anoxia-tolerance appears to be related to a retarded rate of ATP depletion. To investigate the relationship between this slow ATP depletion and the loss of ionic homeostasis, cerebral extracellular K+ concentrations were monitored and ATP levels measured during anoxia, during the initial phase of anoxic depolarization and during complete anoxic depolarization. Extracellular K+ levels were maintained at normoxic levels for at least 3 h of anoxia, while ATP content decreased by 35 %. When ATP levels reached 0.33±0.06 mmol l–1 (mean ± s.e.m., N=5), extracellular K+ levels slowly started to increase. This value is thought to represent a critical ATP concentration for the maintenance of ion homeostasis. When extracellular [K+] reached an inflection value of 4.77±0.84 mmol l–1 (mean ± s.e.m., N=5), approximately 1 h later, the brain quickly depolarized. Part of the reduction in ATP demand was attributable to an approximately 50 % decrease in the rate of K+ efflux from the anoxic frog brain, which would also contribute to the retarded rate of increase in extracellular [K+] during the initial phase of anoxic depolarization. However, unlike the anoxia-tolerant turtle brain, adenosine did not appear to be involved in the downregulation of K+ leakage in the frog brain. The increased anoxia-tolerance of the frog brain is thought to be a matter more of slow death than of enhanced protective mechanisms.

Mitogen-activated protein kinases and anoxia tolerance in turtles

2000 ◽  
Vol 287 (7) ◽  
pp. 477-484 ◽  
Author(s):  
Steven C. Greenway ◽  
Kenneth B. Storey
Keyword(s):  
Protein Kinases ◽  
Anoxia Tolerance ◽  
Mitogen Activated Protein Kinases ◽  
Mitogen Activated Protein
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