67. 藍藻Phormidiumの共生による植物成長促進効果

概要

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Filamentous cyanobacteria are important component of soil, however physiological significance and ecological position are still obscure. The purpose of this study is to elucidate the mechanism of plant growth-acceleration by soil cyanobacteria. Commercial fertilizer, "G-star" enhances the quality of products and, at the same time accelerates the growth of soil cyanobacteria, Phormidium. Under the experimental condition, addition of Phormidium to "G-star" -containing soil enhanced the growth of Komatsuna seedlings, showing the synergic effect. As the water-extract of "G-star" revealed the same effect as the crude material, sterilized agar-plates containing G-star-extract was used for the experiments. Phormidium was separately cultured and supplied as suspension. Phormidium was accelerated their growth by minerals in G-star-extract and they tightly assembled on the root-surface. Phormidium migrated toward the root. Some attractant might be secreted from the roots. The root of seedling became thick and ratio of weight was extremely higher than the others. The stem and leaves were also larger in this seedling. Phormidium excretes polysaccharide-like substance(s). It is suggested these substance(s) and also minerals derived from G-star-extract enhance the growth of the seedlings. The identification of these substance(s) and the effective minerals, and also the attractant substance are under investigation.
植物化学調節学会の論文
2004-10-13