8. 黄緑色藻類Tribonema bombycinumのアキネート形成による耐凍性の上昇(平成11年度第45回低温生物工学会研究報告)

概要

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Many fresh water algae form akinetes that tolerate to enviromental stresses. Yellow-green alga Tribonema bombycinum shifted from vegetative cells to akinetes with nutrient deficiency or desiccation, but cold treatment at 4℃ did not facilitate akinete formation. During akinete formation, the vegetative cells, which had a large central vacuole in the prptoplasm and thin cell walls, morphologically changed to akinetes, which had many small vacuoles and oil droplets in the protoplasm and thick cell walls. During akinete formation, the freezing tolerance (LT_<50>) also increased gradually from -3℃ in vegetative cells to far below -30℃ in akinetes. When vegetative cells were subjected to equilibrium freezing at -15℃, they shrank greatly and aparticulate domains accompanied by fracture-jump lesions occurred in the plasma membranes. Akinetes subjected to equilibrium freezing at -30℃ showed little shrinkage, and freezing-induced ultrastructural changes did not occur in the plasma membranes.
低温生物工学会の論文
1999-12-30