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The Influence of CO2 on Plant Antioxidants

Center for the Study of Carbon Dioxide and Global Change. "The Influence of CO2 on Plant Antioxidants.” Last modified January 8, 2015. http://www.co2science.org/subject/a/summaries/antioxidants.php.

Salt Lake City 1/16/2015 3:39:43 PM

Environmental stresses induced by exposure to pollutants, drought, intense solar radiation and high air or water temperatures generate highly-reactive oxygenated compounds that damage both terrestrial and aquatic plants. Ameliorating these stresses typically involves the production of antioxidant enzymes that scavenge and detoxify the highly-reactive oxygenated compounds.Hence, when stresses are present, concentrations and/or activities of antioxidants in plants are generally observed to be high; and a good question to ask, therefore, is how atmospheric CO2 enrichment impacts this relationship and what the observed results imply. A number of researchers have done just that, and in this summary we highlight what they have learned.

In a study of two soybean genotypes, Pritchard et al.(2000)1 reported that three months' exposure to twice-ambient CO2 concentrations reduced the activities of superoxide dismutase and catalase by an average of 23 and 39%, respectively. Likewise, Polle et al. (1997)2 showed that two years of atmospheric CO2 enrichment reduced the activities of several key antioxidative enzymes, including catalase and superoxide dismutase, in beech seedlings. And Schwanz and Polle (1998)3 demonstrated that this phenomenon can persist indefinitely, for they discovered similar reductions in these same enzymes in mature oak trees that had been growing near natural CO2-emitting springs for 30 to 50 years. 

The standard interpretation of these results is that the observed reductions in the activities of ntioxidative enzymes under CO2-enriched conditions imply that plants exposed to higher-than-current atmospheric CO2 concentrations experience less oxidative stress and thus have a reduced need for antioxidant protection. This conclusion further suggests that "CO2-advantaged" plants will be able to funnel more of their limited resources into the production of other plant tissues or processes essential to their continued growth and development.

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The Influence of CO2 on Plant Antioxidants

Center for the Study of Carbon Dioxide and Global Change. "The Influence of CO2 on Plant Antioxidants.” Last modified January 8, 2015. http://www.co2science.org/subject/a/summaries/antioxidants.php.

Released On: 1/16/2015
Views: 6216

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Health Effects of Hot Vs Cold Temperatures in Asia

Health Effects of Hot Vs Cold Temperatures in Asia.

Released On: 1/5/2015
Views: 6452

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Coral Reef Responses to Temperature Stress: Thermal Adaptation

Coral Reef Responses to Temperature Stress: Thermal Adaptation. As living entities, corals are not only acted upon by the various elements of their environment,they also react or respond to them.

Released On: 12/29/2014
Views: 6096

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Forest Growth Response to CO2

Forest Growth Response to CO2. By examining various properties of tree rings, researchers can deduce how historical increases in the air's CO2 concentration have already affected tree productivity and water use efficiency.

Released On: 12/29/2014
Views: 4700

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Onward Marches the Great Pause

Onward Marches the Great Pause. Since October 1996 there has been no global warming at all (Fig. 1).

Released On: 12/29/2014
Views: 3762

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RESPONSE OF VARIOUS MARINE ANIMALS TO OCEAN ACIDIFICATION AND WARMING

RESPONSE OF VARIOUS MARINE ANIMALS TO OCEAN ACIDIFICATION AND WARMING.

Released On: 12/8/2014
Views: 3383

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FACE EXPERIMENTS AND GRASSLAND SPECIES

FACE EXPERIMENTS AND GRASSLAND SPECIES.

Released On: 12/8/2014
Views: 3973

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EFFECTS OF OCEAN ACIDIFICATION ON FISH

EFFECTS OF OCEAN ACIDIFICATION ON FISH.

Released On: 12/8/2014
Views: 4017

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Response of Fish to Ocean Warming

Response of Fish to Ocean Warming. According to the IPCC, CO2-induced global warming will be net harmful to the world's marine species.

Released On: 11/21/2014
Views: 3940

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Long-Term Open-Top-Chamber Study of Sour Orange Trees

Long-Term Open-Top-Chamber Study of Sour Orange Trees. Eight 30-cm-tall sour orange tree (Citrus aurantium L.) seedlings were planted directly into the ground at the Agricultural Research Service's U.S. Water Conservation Laboratory in Phoenix, A ...

Released On: 11/21/2014
Views: 3970

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The Global Medieval Warm Period

The Global Medieval Warm Period. Between the 10th and 14th centuries AD, earth's average global temperature may have been warmer than it is today.

Released On: 11/21/2014
Views: 3735

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Growth Rates of Old versus Young Forest Trees

Growth Rates of Old versus Young Forest Trees. The planting and preservation of forests has long been acknowledged to be an effective and environmentally-friendly means for slowing climate-model-predicted CO2-induced global warming.

Released On: 9/30/2014
Views: 4028

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Tropical Trees

Citation: Center for the Study of Carbon Dioxide and Global Change. "Tropical Trees.”

Released On: 9/30/2014
Views: 4036

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Water Use Efficiency of Agricultural Species

Water Use Efficiency of Agricultural Species.

Released On: 9/30/2014
Views: 3988

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GLOBAL TEMPERATURES AND BIOSPHERIC PRODUCTIVITY

Global temperatures and biospheric productivity. Among the many climate-alarmist fears of CO2-induced global warming is the concern that the productivity of the biosphere will decline if global temperatures rise to the extent predicted by compute ...

Released On: 9/13/2014
Views: 3952

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REWRITING SUNSPOT HISTORY

Rewriting sunspot history. In 2006, when I first made the mistake of writing publicly of my doubts about the Party Line on manmade global warming.

Released On: 9/13/2014
Views: 4001

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ANALYSIS OF THE SECOND ORDER DRAFT OF THE WORKING GROUP I CONTRIBUTION TO IPCC 5AR

ANALYSIS OF THE SECOND ORDER DRAFT OF THE WORKING GROUP I CONTRIBUTION TO IPCC 5AR. The preparation of IPCC Assessment Reports involves several stages.

Released On: 9/13/2014
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THE ECONOMICS OF BIOFUELS

The economics of biofuels. Aside from rejecting biofuel expansion and use for environmental reasons.

Released On: 9/13/2014
Views: 3697

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