Ultrastructural Effects of Magnaporthe grisea Toxin(s) on Mitochondria of Host and Non-host Plants.

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  • UEHARA Tamaki
    Faculty of Life and Environmental Science, Shimane University
  • ARASE Sakae
    Faculty of Life and Environmental Science, Shimane University Electron Microscopy Section, Department of Orthopaedic Surgery, Teikyo University School of Medicine
  • HONDA Yuichi
    Faculty of Life and Environmental Science, Shimane University
  • PARK Pyoyun
    Electron Microscopy Section, Department of Orthopaedic Surgery, Teikyo University School of Medicine
  • NOZU Mikio
    Faculty of Life and Environmental Science, Shimane University

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Other Title
  • イネいもち病菌(<i>Magnaporthe grisea</i>)毒素による宿主および非宿主植物葉細胞のミトコンドリアの微細構造変化
  • Ultrastructural Effects of Magnaporthe

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Abstract

Magnaporthe grisea produces a toxin(s) which is important in the establishment of basic compatibility at the species level between fungus and plant. The effects of the toxin(s) on host (rice and barley) and non-host (finger millet) plants were examined by ultrastructural observation and morphometric measurement. The first ultrastructural changes observed after 1 hr of toxin(s) treatment were a decrease in the number of mitochondrial cristae and in the electron density of the mitochondrial matrix in rice leaf cells. Further, such modifications were observed in both compatible and incompatible inoculated with the fungal strain used for preparation of the toxin(s). However, morphological and ultrastructural changes were not observed in other organelles. Such phenomena were observed in all leaf tissues (epidermis, mesophyll and vascular bundle) of host plants. On the other hand, the effects of toxin(s) were not observed in leaves of the non-host plant. These results suggested that the mitochondrial modifications induced by the toxin(s) were a host-specific phenomenon and possibly, on essential event for M. grisea to establish basic compatibility with host plants at the species level.

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