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The time and duration of the premeiotic inteprhase in microsporocytes ofTrillium kamtschaticum
Authors:Masaharu Yoshioka  Masuo Maeda  Michio Ito
Institution:(1) Department of Biology, Faculty of Science, Nagoya University, 464 Nagoya;(2) Biological Laboratory, Faculty of Education, Fukui University, 910 Fukui
Abstract:The time and duration of each phase of the premeiotic interphase were determined in microsporocytes of two clones (S and K clones) ofTrillium kamtschaticum. After collectionTrillium plants were stored at 3 C or 7 C prior to completion of premeiotic mitosis in archesporial cells. For autoradiography, cells were explanted in the presence of3H-thymidine to identify the interval of the premeiotic DNA synthesis. Approximate durations of the G1, S and G2 phases for the K clone stored at 3 C were estimated to be 12, 12 and 14 days, respectively. The interval of premeiotic development was markedly different between clones. A high degree of synchrony in meiotic development, which is usually observed within anthers up to late meiotic prophase, was confirmed at the S phase, suggesting that synchrony is established during the G1 interval.
Keywords:Cell cycle  Meiosis  Microsporocyte  Premeiosis            Trillium
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