Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Nucelear Degeneration During Reduced Sporogenesis in Blastocladiella emersonii

Blastocladiella emersonii의 단축된 포자형성과정에서 관찰된 핵의 소멸

  • Published : 2004.12.01
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Abstract

In Blastocladiella emersonii, a member of zoosporic fungi, development of small sporangia containing a few nuclei can be induced. During these reduced sporogenesis, degeneration of some of the nuclei was observed within the sporangia. This observation supports the hypothesis that the nuclear degeneration is an essential part of sporulation. Morphological changes associated with the nuclear degeneration were similar to those of the autophagy of cytoplasm. This system of nuclear degeneration would become the good model system for the study of autophagy.

Zoosporic fungi의 일종인 Blastocladiella emersonii에서는, 적은 수의 핵을 포함하는 작은 크기의 sporangium의 형성을 유도할 수 있다. 이들의 단축된 포자형성과정에서, sporangium내에 존재하던 일부 핵들의 소멸이 관찰되었다. 이 결과는 핵의 소멸이 포자형성과정의 필수적인 부분과정이라는 가설을 뒷받침해준다. 핵의 소멸과정은 형태적으로 세포질의 autophagy와 유사하였으며, autophagy의 형태적인 발달과정을 연구하기 위한 좋은 모델 시스템이 될 것으로 생각한다.

Keywords

References

  1. Alexopoulos, C. J. and C. W. Mims. 1979. Introductory Mycology. 3rd ed. John Wiley & Sons Inc
  2. Armbruster, H. C. 1982. Sporangiogenesis in three genera of the Saprolegniaceae. I.Pre-sporangium hyphae to early primary spore initial stage. Mycologia 74 433-459
  3. Barstow, W. E., G. D. Freshour, and W. L. Lingle. 1987. Induction of minicycle sporogenesis. p. 270-273. In: Zoosporic fungi in teaching and research. Eds., M. S. Fuller, and A. Jaworski. Southeastern Publishing Corp., Athens, Georgia
  4. Barstow, W. E. and J. S. Lovett. 1978: Ultrastructure of a reduced developmental cycle (Minicycle) in Blastocladiella emersonii. Exp. Mycol. 2 145-155
  5. Cho, C. and M. S. Fuller. 1989. Ultrastructural organization of freeze-substituted zoospores of Phytophthora palmivora. Can. J. Bot. 67, 1493-1499
  6. Cho, H., H. Youn, and C. Cho. 1999. Changes in the number of nuclei during minicycle sporogenesis of Allomyces macrogynus. Mycologia 91:923-929
  7. Dunn, W. A. 1990. Studies on the mechanisms of autophagy: Maturation of the autophagic vacuole. J. Cell Biol. 110, 1935-1945
  8. Dylewski, D. P. and C. E. Miller. 1983. Nuclear elimination during cyst formation in Woronina pythii (Plasmodiophoromycetes). Mycologia 75, 271-279
  9. Fuller, M. S. 1977. The zoospore, hallmark of the aquatic fungi. Mycologia 69, 1-20
  10. Guttes, E., S. Guttes, and H. P. Rusch. 1961. Morphological observations of growth and differentiation of Physarum polycephalum grown in pure culture. Dev. Biol. 3, 588-614
  11. Hemmes, D. E. and H. R. Hohl. 1973. Mitosis and nuclear degeneration: simultaneous events during secondary sporangia formation in Phytophthora palmivora. Can. J. Bot. 51, 1673-1675
  12. Hennessy, S. W. and E. C. Cantino. 1972. Lagphase sporogenesis in Blastocladiella emersonii: induced formation of unispored plantlets. Mycologia 64, 1066-1087
  13. Hepler, P. K. 1981. The structure of the endoplasmic reticulum revealed by osmium tetroxide potassium ferricyanide staining. Eur. J. Cell Biol. 26, 102-110
  14. Machlis, L. 1953. Growth and nutrition of water molds in the subgenus Euallomyces. I. Growth factor requirements. Amer. J. Bot. 40, 189-195
  15. Murphy, M. N. and J. S. Lovett. 1966. RNA and protein synthesis during zoospore differentiation in synchronized cultures of Blastocladiella. Dev. Biol. 14, 68-95
  16. Youatt, J. 1976. Sporangium formation in Allomyces throughout the growth cycle. Trans. Brit. Mycol. Soc. 67, 159-161