Hydrogen Peroxide Contents and Activities of Antioxidative Enzymes among C3, C4 and CAM Plants.

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  • Ｃ３，Ｃ４とＣＡＭ植物における過酸化水素含量と抗酸化酵素活性の差異
  • C3 C4 ト CAM ショクブツ ニ オケル カサンカスイソ ガンリョウ ト コウサンカ コウソ カッセイ ノ サイ

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Abstract

Leaves of nine, seven and nine species, respectively, of C3, C4 and CAM plants, under usual growing conditions, were collected to determine H2O2 content and the activities of oxygen-scavenging enzymes. H2O2 content in leaves of C4 plants was similar to that of C3 plants, whereas that of CAM plants was higher. The superoxide dismutase (SOD), ascorbate peroxidase (APX) and catalase (CAT) activities were higher in C3 plants compared to those of CAM plants. C4 plants exhibited higher APX but lower CAT activities than C3 plants ; however, both activities were higher than those of CAM plants. Our findings indicate that oxygen-scavenging systems in plants, such as those involving H2O2, differ from their photosynthetic capacities.

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