Sexual Reproduction of Interior Spruce (Pinaceae). I. Pollen Germination to Archegonial Maturation

@article{Runions1999SexualRO,
  title={Sexual Reproduction of Interior Spruce (Pinaceae). I. Pollen Germination to Archegonial Maturation},
  author={C. John Runions and John N. Owens},
  journal={International Journal of Plant Sciences},
  year={1999},
  volume={160},
  pages={631 - 640}
}
Stages of normal sexual reproduction between pollen germination and egg maturation are described for interior spruce. These prezygotic stages were studied by light and electron microscopy in more detail than was possible in previous studies, and new observations have been made. Sperm (male gametes) formation and the organelles that accompany the sperm within the pollen tube are described. The pollen tube grows toward a lipid secretion that originates in the neck region of the archegonium… 
Sexual Reproduction of Interior Spruce (Pinaceae). II. Fertilization to Early Embryo Formation
TLDR
Stages of normal sexual reproduction between pollen tube penetration of the archegonium and early embryo formation are described for interior spruce by light and electron microscopy in more detail than was possible in previous studies, and new observations have been made.
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TLDR
It is concluded that mechanical properties of the cell wall and turgor pressure could shift the balance towards one of the germination patterns.
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A current synthesis of data from modern and fossil plants paints a new picture of sexual fluids, including nectar, as a foundational component of gymnosperm reproductive evolution. We review the
Oviposition strategies of conifer seed chalcids in relation to host phenology
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It is predicted that the presence of a larva in unfertilized ovules of all Pinaceae will influence the development of the female gametophyte by preventing its abortion and represents a much more efficient oviposition strategy than searching and locating only fertilized seeds.
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Results suggested that the tentpole led to the degeneration of the megaspore membrane and then supported the pliable apex of the nucellar tissues, which contributed to supplying nutrition for fertilization and embryo development.
Updating embryonic ontogenesis in Araucaria angustifolia: from Burlingame (1915) to the present
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The morphohistological characterization of pre-fertilization and embryonic stages, together with the timescale of megastrobili development, warranted a referential map of female reproductive structure in this species.
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TLDR
Stages of normal sexual reproduction between pollen tube penetration of the archegonium and early embryo formation are described for interior spruce by light and electron microscopy in more detail than was possible in previous studies, and new observations have been made.
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TLDR
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TLDR
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TLDR
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TLDR
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TLDR
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