Proceedings of the Japan Academy, Series B
Online ISSN : 1349-2896
Print ISSN : 0386-2208
ISSN-L : 0386-2208
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Review Series to Celebrate Our 100th Volume
  • Isolation and grouping of RNA phages by Itaru Watanabe et al. (1967)
    Fumio ARISAKA
    2024 Volume 100 Issue 4 Pages 253-263
    Published: April 11, 2024
    Released on J-STAGE: April 11, 2024
    DOIhttps://doi.org/10.2183/pjab.100.017
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    I. Watanabe et al. isolated approximately 30 strains of RNA phages from various parts of Japan. To isolate RNA phages, they assessed the infection specificity of male Escherichia coli and RNase sensitivity. They found that the isolated strains of RNA phages could be serologically separated into three groups. Furthermore, most of them were serologically related, and the antiphage rabbit serum prepared by one of these phages neutralized most of the other phages. The only serologically unrelated phage was the RNA phage Qβ, which was isolated at the Institute for Virus Research, Kyoto University, in 1961.

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Review
  • Molecular mechanisms of self-incompatibility in Brassicaceae and Solanaceae
    Kohji MURASE, Seiji TAKAYAMA, Akira ISOGAI
    2024 Volume 100 Issue 4 Pages 264-280
    Published: April 11, 2024
    Released on J-STAGE: April 11, 2024
    DOIhttps://doi.org/10.2183/pjab.100.014
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    Self-incompatibility (SI) is a mechanism for preventing self-fertilization in flowering plants. SI is controlled by a single S-locus with multiple haplotypes (S-haplotypes). When the pistil and pollen share the same S-haplotype, the pollen is recognized as self and rejected by the pistil. This review introduces our research on Brassicaceae and Solanaceae SI systems to identify the S-determinants encoded at the S-locus and uncover the mechanisms of self/nonself-discrimination and pollen rejection. The recognition mechanisms of SI systems differ between these families. A self-recognition system is adopted by Brassicaceae, whereas a collaborative nonself-recognition system is used by Solanaceae. Work by our group and subsequent studies indicate that plants have evolved diverse SI systems.

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