植物学雑誌
Online ISSN : 2185-3835
Print ISSN : 0006-808X
ISSN-L : 0006-808X
Cytological Studies on the Life Cycle of Some Yeasts
Akira YUASA
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ジャーナル フリー

1970 年 83 巻 980-981 号 p. 60-66

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There are two types of life cycle in Hansenula. The first type is that the vegetative cells undertake meiosis, make four spores, respectively, which germinate and conjugate two by two, becoming the ordinary vegetative cell. So the vegetative cells are always in 2n phase.
The another type is that the vegetative cells conjugate two by two, undertake meiosis, make four spores, respectively, which germinate and become the vegetative cell. So the vegetative cells are always in n phase.
In Schizosaccharomyces pombe the vegetative cells in haploid phase (n=2) conjugate two by two, after many cell divisions by fission. The zygote (2n=4), thus produced, undertakes meiosis at once and makes four spores (n=2). Each spore germinates and becomes the vegetative cell in haploid phase.

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© The Botanical Society of Japan
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