The Effects of Water-immersion on the Meiotic Division and Chromosomes in <i>Trillium kamtschaticum</i>

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  • OHNO Rinjiro
    Botanical Institute, Faculty of Science, Hokkaido University
  • TAKEHISA Shin
    Botanical Institute, Faculty of Science, Hokkaido University

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Other Title
  • オオバナノエンレイソウの減数分裂におよぼす水浸処理の効果
  • オオバナノエンレイソウ ノ ゲンスウ ブンレツ ニ オヨボス スイシン ショリ ノ コウカ
  • The Effects of Water-immersion on the Meiotic Division and Chromosomes in Trillium kamtschaticum

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Description

The flower buds of Trillium kamtschaticum, while undergoing meiotic late-prophase or metaphase I, were immersed into tap-water either at 7-12°or 25°for 24, 48 and 72 hours. In the present experiment the whole body of the plant was completely immersed after anthers were laid as bare as possible without removal of sepals and petals. Cytological fixations of PMCs were made at the ends of the treatment and 24 hours intervals thereafter.<br>The results showed that (1) under the treatment of water-immersion at both 7-12° and 25°the meiotic division did not proceed, accompanying a phenomenon of coalescence of chromosomes; (2) after the treatment the 1st meiotic division proceeded more slowly than that of control. Further, it is also evident that the treatment of water-immersion effected (3) no induction of chromosome breakage and (4) at 25°increase of the aberrations in telophase I which were due to abnormalities of spindle function compared with those in control.

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