生物物理
Online ISSN : 1347-4219
Print ISSN : 0582-4052
ISSN-L : 0582-4052
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通巻345号
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  • 古澤 力, 堀之内 貴明
    2019 年 59 巻 5 号 p. 262-265
    発行日: 2019年
    公開日: 2019/09/27
    ジャーナル フリー

    During adaptive evolution, phenotype and genotype dynamically change; however, the relationship between these changes and associated constraints is yet to be fully elucidated. In this review, we focus on the analysis of phenotypic and genotypic changes occurred in Escherichia coli cells during laboratory evolution experiments. We demonstrated that the change of fitness can be quantitatively predicted by the expression changes of a small number of genes, suggesting that phenotypic changes in adaptive evolution are constrained on relatively low-dimensional dynamics. The automated system for laboratory evolution is also presented, which enables us to achieve large-scale data in bacterial adaptive evolution.

  • 北沢 美帆, 藤本 仰一
    2019 年 59 巻 5 号 p. 266-270
    発行日: 2019年
    公開日: 2019/09/27
    ジャーナル フリー

    Component number of flowers is an important aspect to capture floral morphology. Beside the diversity of floral shapes, basic numbers of the components are restricted to several numbers associated with the major clades of flowering plants. The developmental and evolutionary reason of such restriction has been a question for centuries. To answer this, we employed mathematical models developed for phyllotaxis, i.e., arrangement of leaves around the stem. The model showed that basic numbers of four and five, the major numbers in the largest clade of flowering plants, appeared spontaneously and stably, suggesting that preferences in developmental process underlie the restriction.

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