Ultrastructural changes of the fission yeast (Schizosaccharomyces pombe) during ascospore formation
Ultrastructural changes of the fission yeast (Schizosaccharomyces pombe) during ascospore formation
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子囊孢子形成过程中裂殖酵母（裂殖酵母）的超微结构变化
DOI：
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发表时间：
1973
期刊：
影响因子：
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通讯作者：
B. Johnson
中科院分区：
文献类型：
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作者：
B. Yoo;G. B. Calleja;B. Johnson
摘要裂殖酵母，粟酒裂殖酵母，一种同宗单倍体菌株 NCYC 132，被诱导絮凝和缀合，以促进子囊孢子发生的研究。研究发现，在减数分裂 I 期间形成两个细胞核，而这些细胞核在减数分裂 II 期间再次分裂。前孢子膜在减数分裂 II 开始时出现，伸长而不破碎以包围细胞核和其他细胞质细胞器，包括线粒体和内质网。减数分裂发生时核膜不破裂。在包围细胞核后，前孢子膜立即分解成两个单独的膜。内部的似乎成为孢子质膜，外部的如果持续存在，则成为孢子壁的限制膜。在某些情况下，外膜可见破裂。孢子壁材料沉积在内膜和外膜之间的空间中。
SummaryThe fission yeast, Schizosaccharomyces pombe, a homothallic haploid strain NCYC 132, was induced to flocculate and conjugate to facilitate the study of the ascosporogenesis. It is found that two nuclei are formed during meiosis I and these nuclei divide again during meiosis II. The forespore membrane emerges at the beginning of meiosis II, elongates without fragmentation to enclose the nucleus and other cytoplasmic organelles, including mitochondria and ER. Meiosis occurs without fragmentation of the nuclear membrane. Immediately after the enclosure of the nucleus, the forespore membrane is resolved into two separate membranes. The inner one appears to become the spore plasmalemma and the outer one, if it persists, becomes a limiting membrane of the spore wall. In some cases, the outer membrane is seen to be ruptured. Spore wall materials deposite in the space between the inner and outer membranes.