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  1. No Access

    Article

    Sporogenesis in Bryophytes: Patterns and Diversity in Meiosis

    Meiosis in bryophytes retains unusual features that provide clues to the innovation of sporogenesis in early land plants. Sporocytes are typically quadrilobed before nuclear division and the meiotic spindle is...

    Roy C. Brown, Betty E. Lemmon in The Botanical Review (2013)

  2. 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)

  3. No Access

    Article

    Pre-meiotic bands and novel meiotic spindle ontogeny in quadrilobed sporocytes of leafy liverworts (Jungermannidae, Bryophyta)

    Indirect immunofluorescence and confocal microscopy were used to study the nucleation and organization of microtubules during meiosis in two species of leafy liverworts, Cephalozia macrostachya and Telaranea long...

    Roy C. Brown, Betty E. Lemmon in Protoplasma (2009)

  4. 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)

  5. No Access

    Article

    Mutation in the Arabidopisis thaliana DEK1 calpain gene perturbs endosperm and embryo development while over-expression affects organ development globally

    A T-DNA insertion in the Arabidopsis thaliana DEK1 gene, encoding a calpain-like cysteine proteinase with a predicted membrane anchor, causes unorganized embryo development displaying irregular mitotic divisions ...

    Stein Erik Lid, Lene Olsen, Ragnhild Nestestog, Milo Aukerman, Roy C. Brown… in Planta (2005)

  6. 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)

  7. 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)

  8. 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)

  9. 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)

  10. No Access

    Article

    Phragmoplasts in the Absence of Nuclear Division

    Roy C. Brown, Betty E. Lemmon in Journal of Plant Growth Regulation (2001)

  11. No Access

    Article

    RNA Isolation without Gel Formation from Oligosaccharide-Rich Onion Epidermis

    A new method for the isolation of total RNA from plant tissues is described. This method is designed to circumvent problems resulting from endogenous materials that typically gel during isolation when previous...

    Juhua Zhou, Thomas C. Pesacreta, Roy C. Brown in Plant Molecular Biology Reporter (1999)

  12. No Access

    Article

    Cell wall (1 → 3)- and (1 → 3, 1 → 4)-β-glucans during early grain development in rice (Oryza sativa L.)

    Immunogold labeling was used to study the distribution of (1 → 3)-β-glucans and (1 → 3, 1 → 4)-β-glucans in the rice grain during cellularization of the endosperm. At approximately 3–5 d after pollination the...

    Roy C. Brown, Betty E. Lemmon, Bruce A. Stone, Odd-Arne Olsen in Planta (1997)

  13. 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)

  14. 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)

  15. No Access

    Article

    Nuclear cytoplasmic domains, microtubules and organelles in microsporocytes of the slipper orchid Cypripedium californicum A. Gray dividing by simultaneous cytokinesis

    Microsporocytes of the slipper orchidCypripedium californicum A. Gray divide simultaneously after second meiosis. The organization and apportionment of the cytoplasm throughout meiosis are functions of nuclear-ba...

    Roy C. Brown, Betty E. Lemmon, R. C. Brown, B. E. Lemmon in Sexual Plant Reproduction (1996)

  16. No Access

    Article

    Pollen mitosis in the slipper orchid Cypripedium fasciculatum

    Pollen mitosis in the slipper orchid Cypripedium fasciculatum was studied using correlated methods of immunofluorescence and transmission electron microscopy. Unlike the more highly evolved orchids, the cypripedi...

    Roy C. Brown, Betty E. Lemmon in Sexual Plant Reproduction (1994)