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  1. No Access

    Article

    Diversity in meiotic spindle origin and determination of cytokinetic planes in sporogenesis of complex thalloid liverworts (Marchantiopsida)

    As the earliest divergent land plants, bryophytes (mosses, hornworts, and liverworts) provide insight into the evolution of the unique plant process of sporogenesis by which meiosis results in heavy walled spo...

    Roy C. Brown, Betty E. Lemmon, Masaki Shimamura in Journal of Plant Research (2010)

  2. No Access

    Article

    Microtubules in early development of the megagametophyte of Ginkgo biloba

    Food storage tissue in the seeds of gymnosperms is female gametophyte (megagametophyte) that develops before fertilization, whereas, in seeds of angiosperms, food is stored as endosperm initiated by double fer...

    Roy C. Brown, B. E. Lemmon in Journal of Plant Research (2008)

  3. No Access

    Article

    γ-Tubulin, microtubule arrays, and quadripolarity during sporogenesis in the hepatic Aneura **uis (Metzgeriales)

    This is the first report on the organization of a quadripolar microtubule system (QMS) in polyplastidic meiosis of a hepatic with polar organizers (POs). Unlike the monoplastidic sporocytes of mosses and hornw...

    Roy C. Brown, B. E. Lemmon in Journal of Plant Research (2004)

  4. No Access

    Article

    The microtubule cycle during successive mitotic waves in the syncytial female gametophyte of ginkgo

    Plant morphogenesis is driven by a surprising number of microtubule arrays. The four arrays of vegetative tissues are hoop-like cortical, preprophase band (PPB), spindle, and phragmoplast. When syncytia occur ...

    Roy C. Brown, B. Lemmon, H. Nguyen in Journal of Plant Research (2002)

  5. No Access

    Article

    Sporogenesis in Eusporangiate Ferns: II. Polyplastidic Meiosis in Ophioglossum (Ophioglossales)

    . Unlike Angiopteris (Marattiales), which is monoplastidic, Ophioglossum undergoes polyplastidic meiosis like members of the fern-seed plant clade. The meiotic spindle is distinctly multipolar in origin and is co...

    Roy C Brown, BE Lemmon in Journal of Plant Research (2001)

  6. No Access

    Article

    Sporogenesis in Eusporangiate Ferns: I. Monoplastidic Meiosis in Angiopteris (Marattiales)

    (Marattiales) undergoes the more primitive form of monoplastidic meiosis, while other ferns have evolved the polyplastidic type typical of seed plants. In monoplastidic cell division, the single plastid divid...

    Roy C Brown, BE Lemmon in Journal of Plant Research (2001)

  7. No Access

    Article

    The quadripolar microtubule system in lower land plants

    The quadripolar microtubule system (QMS) is a complex array that is associated with predivision establishment of quadripolarity in sporocytes of lower plants (bryophytes and lycopsids). The QMS unerringly pred...

    Roy C. Brown, Betty E. Lemmon in Journal of Plant Research (1997)

  8. No Access

    Article

    Development of the endosperm in rice (Oryza sativa L.): Cellularization

    The syncytial endosperm of rice undergoes cellularization according to a regular morphogenetic plan. At 3 days after pollination (dap) mitosis in the peripheral synctium ceases. Radial systems of microtubules ...

    Roy C. Brown, Betty E. Lemmon, Odd-Arne Olsen in Journal of Plant Research (1996)