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Expression of the cell cycle in sperm of Arabidopsis: implications for understanding patterns of gametogenesis and fertilization in plants and other eukaryotes.
  • W. Friedman
  • Environmental Science, Biology
    Development
  • 1 March 1999
TLDR
Comparison of the patterns of cell cycle activity in sperm of Arabidopsis and other angiosperms may be used to predict which flowering plants will be amenable to development of successful in vitro fertilization techniques.
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SHOOTLESSNESS, VELAMENTOUS ROOTS, AND THE PRE-EMINENCE OF ORCHIDACEAE IN THE EPIPHYTIC BIOTOPE.
TLDR
M Modes of carbon gain and the possible pathway for movement of fungus-borne carbon into an orchid's pool of assimilates are described, as is the possible significance of these processes to survival in forest canopy habitats.
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The meaning of Darwin's 'abominable mystery'.
  • W. Friedman
  • Environmental Science
    American journal of botany
  • 2009
TLDR
Darwin's thoughts and frustrations with the fossil record of flowering plants as revealed in correspondence with Joseph Hooker, Gaston de Saporta, and Oswald Heer between 1875 and 1881 are explicated.
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Embryological evidence for developmental lability during early angiosperm evolution
TLDR
A novel type of embryo sac (angiosperm female gametophyte or haploid egg-producing structure) is found in Amborella trichopoda, the sole member of the most ancient extant angiosperm lineage, and may provide evidence of a critical link to the gymnospermous ancestors of flowering plants.
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Developmental selection within the angiosperm style: using gamete DNA to visualize interspecific pollen competition.
TLDR
This work studied the contribution of postpollination, prefertilization processes to reproductive isolation in two wind-pollinated species of birch (Betula) that commonly hybridize in nature and detected strong, early postpollinated barriers such as pollen tube incompatibility, slower pollen tube growth, and delayed generative cell mitosis.
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The four-celled female gametophyte of Illicium (Illiciaceae; Austrobaileyales): implications for understanding the origin and early evolution of monocots, eumagnoliids,and eudicots.
TLDR
A character analysis based on more than 250 embryological studies indicates that a transition from an ancestrally four-celled/four-nucleate Illicium-like female gametophyte to a seven-CElled/eight-n nucleate female gamETophyte occurred in the common ancestor of the sister group to Austrobaileyales.
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Arbuscular mycorrhizal associations in Lycopodiaceae.
TLDR
The results suggest that most mycoheterotrophic plants that form AM associations do so with restricted clades of Glomus A, and raises the possibility that photosynthetic sporophytes are a source of carbon to conspecific myco heterotrophic gametophytes via shared fungal networks.
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ROOTS OF SOBRALIA MACRANTHA (ORCHIDACEAE): STRUCTURE AND FUNCTION OF THE VELAMEN‐EXODERMIS COMPLEX
TLDR
The root of Sobralia macrantha is described and how it functions under the constraints imposed by epiphytism, saxicoly, or life in seasonally dry soil is suggested.
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Evolution of Endosperm Developmental Patterns among Basal Flowering Plants
  • S. FloydW. Friedman
  • Environmental Science
    International Journal of Plant Sciences
  • 1 November 2000
TLDR
It is discovered that differential developmental fate of chalazal and micropylar domains is a common pattern among the endosperms of all basal angiosperm taxa and suggested that this may be a feature of endosperm development in all angiosperms.
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Double Fertilization in Ephedra, a Nonflowering Seed Plant: Its Bearing on the Origin of Angiosperms
TLDR
Double fertilization and the associated formation of endosperm have long been considered unique and defining characters of the angiosperms and may represent an evolutionary homology.
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