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Akinete Formation in Tribonema bombycinum Derbes et Solier (Xanthophyceae) in Relation to Freezing Tolerance 总被引:1,自引:0,他引:1
Manabu Nagao Keita Arakawa Daisuke Takezawa Shizuo Yoshida Seizo Fujikawa 《Journal of plant research》1999,112(2):163-174
Tribonema bombycinum (Xanthophyceae), was examined. T. bombycinum shifted from vegetative cells to akinetes with starving by a prolonged batch culture, by culture with a diluted medium, or
by culture with a single nutrient-deficient medium. In addition, akinetes developed by desiccation, but cold treatment at
4 C did not facilitate akinete formation. During starving, the vegetative cells, which had a large central vacuole in the
protoplasm and thin cell walls, finally changed to akinetes, which had many small vacuoles and oil droplets in the protoplasm
and thick cell walls. During akinete formation by starving, the freezing tolerance (LT50) increased gradually from −3 C in vegetative cells to far below −30 C in akinetes. When vegetative cells were subjected to
equilibrium freezing, their size shrank greatly and aparticulate domains accompanied by fracture-jump lesions developed in
the plasma membranes. Akinetes subjected to equilibrium freezing showed little shrinkage, and freezing-induced ultrastructural
changes did not occur in the plasma membranes. The morphological changes in the process of akinete formation and the responses
to equilibrium freezing resembled those of cold-acclimated terrestrial plants.
Received 24 November 1998/ Accepted in revised form 1 February 1999 相似文献
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