antioxidants in photosynthesis and human nutrition science.

notes on nutrition in animals antioxidants in photosynthesis and human nutrition science

in photosynthesis and human nutrition.

85) Adams WW III, Demmig-Adams B (2004) Chlorophyll fluorescence as a tool to monitor plant response to the environment. GC Papageorgiou, Govindjee (eds) Chlorophyll a Fluorescence: A Signature of Photosynthesis. Advances in Photosynthesis and Respiration, Volume 19. Springer, Dordrecht, pp. 583-604

Antioxidants in photosynthesis and human nutrition.

Antioxidants in Photosynthesis and Human Nutrition, Demmig-Adams ..

The relative importance of the antioxidant and pro-oxidant activities of antioxidants is an area of current research, but vitamin C, which exerts its effects as a vitamin by oxidizing polypeptides, appears to have a mostly antioxidant action in the human body. However, less data is available for other dietary antioxidants, such as vitamin E, or the . Likewise, the pathogenesis of diseases involving hyperuricemia likely involve uric acid's direct and indirect pro-oxidant properties.

Adams IIIAntioxidants in photosynthesis and human nutrition

82) Demmig-Adams B, Ebbert V, Adams WW III (2004) Photosynthesis and stress. In Goodman RM (ed) Encyclopedia of Plant & Crop Science, Marcel Dekker, New York, pp. 901-905

"Antioxidants in photosynthesis and human nutrition"


13/12/2002 · Abstract

(SODs) are a class of closely related enzymes that catalyze the breakdown of the superoxide anion into oxygen and hydrogen peroxide. SOD enzymes are present in almost all aerobic cells and in extracellular fluids. Superoxide dismutase enzymes contain metal ion cofactors that, depending on the isozyme, can be copper, zinc, or iron. In humans, the copper/zinc SOD is present in the , while manganese SOD is present in the . There also exists a third form of SOD in , which contains copper and zinc in its active sites. The mitochondrial isozyme seems to be the most biologically important of these three, since mice lacking this enzyme die soon after birth. In contrast, the mice lacking copper/zinc SOD (Sod1) are viable but have numerous pathologies and a reduced lifespan (see article on ), while mice without the extracellular SOD have minimal defects (sensitive to ). In plants, SOD isozymes are present in the cytosol and mitochondria, with an iron SOD found in that is absent from and .

Demmig-Adams, B.; Adams, W.W., III

In this study, no significant differences in survival rate were found for the 1-year-old seedlings (), suggesting that seedlings had a wide plasticity at the earliest stage, allowing their acclimation to different light transmittance regimes. However, 30% light transmittance had the highest survival rate for the 2-year-old seedlings, indicating similar light requirements for both seedling survival and seed germination of . Carbohydrates are critical for maintaining the metabolism and provide a buffer for seedlings under stressful conditions (). Thus, the overall lower survival rates for 2-year-old seedlings than for 1-year-old seedlings might reflect a lag effect of seedlings to different light irradiance. Morphologically, 60%-100% light transmittance was the optimum level for seedling height, root collar diameter and total biomass of seedlings (, ). This is supported by the finding that the light-saturated photosynthetic rates in 60% and 100% treatments were higher than those in other light treatments for 5-year-old seedlings (). Furthermore, as a response to shadier conditions, the largest and were found in 5% light transmittance to maximize the light capture.

Antioxidants such as thiols or ..

The relative importance of the antioxidant and pro-oxidant activities of antioxidants is an area of current research, but vitamin C, which exerts its effects as a vitamin by oxidizing polypeptides, appears to have a mostly antioxidant action in the human body. However, less data is available for other dietary antioxidants, such as vitamin E, or the . Likewise, the pathogenesis of diseases involving hyperuricemia likely involve uric acid's direct and indirect pro-oxidant properties.