Regulation of arbuscular mycorrhiza symbiosis: Hyphal growth in host roots and nutrient exchange

Masanori Saito

研究成果: Article査読

3 被引用数 (Scopus)

抄録

Arbuscular mycorrhizal (AM) fungi, which have often been designated as vesicular-arbuscular mycorrhizal (VAM) fungi, symbiotically inhabit plant roots. The promotion of phosphorus uptake and plant growth of host by AM fungi is now well recognized. Therefore, it is anticipated that AM symbiosis could be applied for sustainable agriculture. The author investigated the regulation of the symbiosis with emphasis placed on nutrient exchange, namely phosphorus transfer from AM fungi to host plant and reverse transfer of carbon. The following results were obtained: 1) The growth of AM fungi in host roots was regulated by the supply of photosynthates and the growth of both partners in the symbiosis was well harmonized. 2) A new method for the isolation of intraradical hyphae from host root tissues was developed. The characteristics of enzyme activities in the isolated intraradical hyphae suggest that alkaline phosphatase activity is localized in arbuscular hyphae and that glucose is one of the carbon sources from host plant to AM fungi. 3) Electrophoresis analysis showed that symbiosis-specific alkaline phosphatase was present in the soluble protein of mycorrhizal roots. The phosphatase may originate from AM fungi. Based on these findings, the regulation of the symbiosis was discussed.

本文言語English
ページ(範囲)179-183
ページ数5
ジャーナルJapan Agricultural Research Quarterly
31
3
出版ステータスPublished - 1997 7 1

ASJC Scopus subject areas

  • バイオテクノロジー
  • 生態学
  • 動物科学および動物学
  • 農業および作物学

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