Image Diagnosis of Photosynthetic Injuries Induced by Herbicides in Plants. Analysis of the Effects of Soil-Application Type Urea Herbicide on in situ Cucumber Leaves.

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  • TAKAYAMA Kotaro
    The University of Tokyo, Graduate School of Agricultural and Life Sciences
  • OMASA Kenji
    The University of Tokyo, Graduate School of Agricultural and Life Sciences

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Other Title
  • 除草剤による植物の光合成機能障害の画像診断　　尿素系土壌処理剤がｉｎ　ｓｉｔｕのキュウリ葉に与える影響の解析
  • ジョソウザイ ニ ヨル ショクブツ ノ コウゴウセイ キノウ ショウガイ ノ ガゾウ シンダン ニョウソケイ ドジョウ ショリザイ ガ in situ ノ キュウリ ヨウ ニ アタエル エイキョウ ノ カイセキ
  • Analysis of the Effects of Soil-Application Type Urea Herbicide on in situ Cucumber Leaves
  • 尿素系土壌処理剤が<I>in situ</I> のキュウリ葉に与える影響の解析

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Abstract

Using a developed chlorophyll (Chl) fluorescence imaging system, the photosynthetic effects of a commercially available soil-application type urea herbicide on attached Cucumis sativus L. leaves were analyzed.<BR>Decreases in the stomatal conductance and the assimilation rate caused by the herbicide were detected with diffusion porometer measurements. However, a decrease in stomatal conductance was smaller than that in assimilation rate.<BR>Photosynthetic injuries caused by the herbicide were detected with the Chl fluorescence imaging system. The inhibitions of primary electron transport in injured areas were detected from Chl fluorescence induction (CFI) images (Changes in intensity of Chl fluorescence during dark-light transition) taken by the CFI method. NPQ (non-photochemical quenching) and Yield (photosystem II photochemical efficiency) images were calculated from fluorescence images taken by the saturation pulse method. NPQ was reduced greatly in injured areas and NPQ images were useful to quantify the photosynthetic injuries. However, Yield was not reduced as much as the decrease in assimilation rate. This showed that Yield images were not suitable for diagnosis of the photosynthetic injuries of attached plant leaves caused by the herbicide.

Journal

  • Shokubutsu Kojo Gakkaishi

    Shokubutsu Kojo Gakkaishi 13 (4), 247-253, 2001

    JAPANESE SOCIETY OF AGRICULTURAL, BIOLOGICAL AND ENVIRONMENTAL ENGINEERS AND SCIENTISTS

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