Abstract
THE species of Lilium examined have twelve pairs of long chromosomes. The numbers of nodes in the bivalents of Lilium longiflorurn (and Lilium regale) were counted at different stages, from the earliest prophase, immediately after the diplotene stage, to the diaphase; and also at the metaphase itself. These counts were usually made after pressing cytoplasm and chromosomes from the cell. Such counts showed that the average number of nodes for the group of twelve chromosome pairs was 22.1 for the diaphase and metaphase, while in the earliest prophase it was found to be 39. Thus nearly half the nodes (43 per cent.) disappeared between the diplotene stage and the diaphase. In L. longifiorum, pollen mother-cells observed at stages between the earliest prophase and the diaphase showed different degrees of diminution in the number of nodes. In the four largest chromosomes of Hosta cœrulec, a similar reduction was observed, from 9 to 5 nodes. From the drawings of Newton (Lirn. Soc. Jour. (Bot.); 1927) it can be estimated that there was a loss of nodes between the earliest prophase and the diaphase of somewhat less than one-half the number in Tulipa.
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BELLING, J. The Diminution in Number of the Nodes in the Bivalents of Lilium. Nature 120, 549 (1927). https://doi.org/10.1038/120549c0
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DOI: https://doi.org/10.1038/120549c0
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