2024/10/02 更新

写真b

エザキ カズネ
江崎 和音
EZAKI Kazune
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理学部
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助教
学内職務経歴*
  • 2023年8月 - 現在 
    理学部   助教
 

論文

  • Precocious cell differentiation occurs in proliferating cells in leaf primordia in Arabidopsis angustifolia3 mutant

    Kazune Ezaki, Hiroyuki Koga, Noriko Takeda-Kamiya, Kiminori Toyooka, Takumi Higaki, Shingo Sakamoto, Hirokazu Tsukaya

    Frontiers in Plant Science15   2024年4月16日

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Frontiers Media SA  

    During leaf development, the timing of transition from cell proliferation to expansion is an important factor in determining the final organ size. However, the regulatory system involved in this transition remains less understood. To get an insight into this system, we investigated the compensation phenomenon, in which the cell number decreases while the cell size increases in organs with determinate growth. Compensation is observed in several plant species suggesting coordination between cell proliferation and expansion. In this study, we examined an Arabidopsis mutant of ANGUSTIFOLIA 3 (AN3)/GRF-INTERACTING FACTOR 1, a positive regulator of cell proliferation, which exhibits the compensation. Though the AN3 role has been extensively investigated, the mechanism underlying excess cell expansion in the an3 mutant remains unknown. Focusing on the early stage of leaf development, we performed kinematic, cytological, biochemical, and transcriptome analyses, and found that the cell size had already increased during the proliferation phase, with active cell proliferation in the an3 mutant. Moreover, at this stage, chloroplasts, vacuoles, and xylem cells developed earlier than in the wild-type cells. Transcriptome data showed that photosynthetic activity and secondary cell wall biosynthesis were activated in an3 proliferating cells. These results indicated that precocious cell differentiation occurs in an3 cells. Therefore, we suggest a novel AN3 role in the suppression of cell expansion/differentiation during the cell proliferation phase.

    DOI: 10.3389/fpls.2024.1322223

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  • Suppression of class I compensated cell enlargement by xs2 mutation is mediated by salicylic acid signaling

    Ushio Fujikura, Kazune Ezaki, Gorou Horiguchi, Mitsunori Seo, Yuri Kanno, Yuji Kamiya, Michael Lenhard, Hirokazu Tsukaya

    PLOS Genetics16 ( 6 )   2020年6月25日

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Public Library of Science ({PLoS})  

    DOI: 10.1371/journal.pgen.1008873

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  • Morphological characterization of domatium development in Callicarpa saccata

    Emma Sarath, Kazune Ezaki, Takenori Sasaki, Yu Maekawa, Yuji Sawada, Masami Yokota Hirai, Akiko Soejima, Hirokazu Tsukaya

    Annals of Botany125 ( 3 ) 521 - 532   2019年11月26日

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Oxford University Press (OUP)  

    Abstract

    Background and aims

    Domatia are plant structures within which organisms reside. Callicarpa saccata (Lamiaceae) is the sole myrmecophyte, or ‘ant plant’, that develops foliar (leaf-borne) myrmeco-domatia in this genus. In this work we examined domatium development in C. saccata to understand the developmental processes behind pouch-like domatia.

    Methods

    Scanning electron microscopy, sectioning and microcomputed tomography were carried out to compare the leaves of C. saccata with those of the closely related but domatia-less myrmecophyte Callicarpa subaequalis, both under cultivation without ants.

    Key results

    Callicarpa saccata domatia are formed as a result of excess cell proliferation at the blade/petiole junctions of leaf primordia. Blade/petiole junctions are important meristematic sites in simple leaf organogenesis. We also found that the mesophyll tissue of domatia does not clearly differentiate into palisade and spongy layers.

    Conclusions

    Rather than curling of the leaf margins, a perturbation of the normal functioning of the blade/petiole junction results in the formation of domatium tissue. Excess cell proliferation warps the shape of the blade and disturbs the development of the proximal–distal axis. This process leads to the generation of distinct structures that facilitate interaction between C. saccata and ants.

    DOI: 10.1093/aob/mcz193

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    その他リンク: http://academic.oup.com/aob/article-pdf/125/3/521/32853849/mcz193.pdf

  • Morphological and phylogenetic investigations for several cryptic ant-plants found in Callicarpa (Lamiaceae) from Borneo

    Shota Nakashima, Emma Sarath, Hiroshi Okada, Kazune Ezaki, Dedy Darnaedi, Hirokazu Tsukaya, Akiko Soejima

    Journal of Plant Research129 ( 4 ) 591 - 601   2016年4月8日

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s10265-016-0820-5

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    その他リンク: http://link.springer.com/content/pdf/10.1007/s10265-016-0820-5.pdf

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