Difference among Organs for Resistance to Oxidation by Light Stress in Tartary and Common Buckwheats

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  • ダッタンソバと普通ソバにおける光酸化抵抗性の器官間差異
  • ダッタンソバ ト フツウ ソバ ニ オケル ヒカリ サンカ テイコウセイ ノ キカン カン サイ

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Abstract

The quenching activity of the singlet oxygen and H_2O_2 in the organs of common and Tartary buckwheats was evaluated for the samples boiled with distilled water (1g/30ml). The plant bodies were separated to leaves, stem, flowers (florets without fertilized and ripened florets) and seeds at early and late stages of blooming. Singlet oxygen lifetime (^1Δg) was measured by time-resolved photon counting of near infra-red induced by YAG laser. H_2O_2 scavenging activity was evaluated by chemiluminescence from samples with a mixed solution of H_2O_2 and acetaldehyde. Singlet oxygen lifetime in the water extracts from flowers was shorter than that from leaves or stem. H_2O_2 scavenging activity was higher in the water extracts from leaves and florets than other organs. Furthermore, these H_2O_2 scavenging activities of common buckwheat were higher than these of Tartary Buckwheat. There was a significant negative correlation between singlet oxygen lifetime and H_2O_2 scavenging activity.

Journal

  • The Hokuriku Crop Science

    The Hokuriku Crop Science 41 (0), 110-113, 2006

    Society for Crop Science and Plant Breeding of Hokuriku

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