Early Detection of Photosynthetic Dysfunction Caused by a Herbicide (Basta) Using Chlorophyll Fluorescence and Thermal Imaging System

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  • TAKAYAMA Kotaro
    Department of Biomechanical Systems, Faculty of Agriculture, Ehime University
  • OMASA Kenji
    Department of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, The University of Tokyo

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The effects of Basta, a commercially available foliar-application type herbicide, on a in situ Phaseolus vulgaris L. leaf was analysed with the chlorophyll fluorescence and thermal imaging system. The images of photosynthetic electron transport activity in photosystem II (ΦPSII) and leaf temperature across a leaf surface were obtained before and after the herbicide treatment. At 30 min after the treatment, ΦPSII began to decease in several sites within the treated region although the leaf temperature did not change. At 60 min after the treatment, the leaf temperature gradually increased at the sites whereΦPSII had markedly decreased. Those results showed that theΦPSII primarily decreased and the leaf temperature increased after the Basta treatment. This suggests that Basta initially inhibited the photosynthetic electron transport activity and the inhibition caused the stomatal closure. This study demonstrated that the early detection and detailed analysis of the physiological damage caused by herbicide are possible using the chlorophyll fluorescence and thermal imaging system.

収録刊行物

  • 農業気象

    農業気象 60 (6), 1179-1181, 2005

    日本農業気象学会

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