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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

The influence of elevated CO2 on the activities of antioxidative enzymes in two soybean genotypes

Seth G. Pritchard, Zhenlin Ju, Edzard van Santen, Jiansheng Qiu, David B. Weaver, Stephen A. Prior and Hugo H. Rogers

Australian Journal of Plant Physiology 27(11) 1061 - 1068
Published: 2000

Abstract

The effects of elevated compared to current atmospheric CO2 concentration (720 and 365 L L –1 , respectively) on antioxidative enzymatic activities of two soybean (Glycine max (L.) Merr.) genotypes (R and S) grown in open-top field chambers were investigated. Enzymatic activities of leaves collected 40, 47, 54 and 61 d after planting were measured. Elevated CO2 significantly decreased activities of superoxide dismutase (SOD, EC 1.15.1.1), peroxidase (POD, EC 1.11.1.7), catalase (CAT, EC 1.11.1.6), ascorbate peroxidase (APOD, EC 1.11.1.7), gluta-thione peroxidase (GPOD, EC 1.11.1.9) and glutathione reductase (GR, EC 1.6.4.2) in both genotypes. The activi-ties of dehydroascorbate reductase (DAR, EC 1.8.5.1) and monodehydroascorbate reductase (MDAR, EC 1.1.5.4.) increased in genotype S, but decreased in genotype R under elevated CO2. Elevated CO2 decreased rubisco activity and rubisco, chlorophyll, carotenoids and total soluble protein contents in both genotypes. Results indicate that constitutive antioxidative enzymatic activities may decrease in a high-CO2 world. Significant CO2 ¥ genotype interactions, however, suggest that there may be key genotypic differences in response patterns, potentially conferring differential resistance to biotic and abiotic stress.

Keywords: antioxidative enzymes, elevated CO2, soybean genotypes.

https://doi.org/10.1071/PP99206

© CSIRO 2000

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