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. J. Runions and J. 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… Expand
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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. Expand
Western white pine (Pinus monticola Dougl.) reproduction: I. Gametophyte development
Abstract Male and female gametophyte development are described from light and transmission electron microscope preparations of ovules from first and second year Pinusmonticola Dougl. seed cones. In… Expand
Paternal cytoplasmic transmission in Chinese pine (Pinus tabulaeformis)
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The cytological mechanism for paternal inheritance of plastids and biparental inheritance of mitochondria in Chinese pine is revealed, emphasizing the transmission of parental cytoplasm, especially the DNA-containing organelles – plastid and mitochondria. Expand
Female Short Shoot and Ovule Development in Ginkgo biloba L. with Emphasis on Structures Associated with Wind Pollination
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The ovules of G. biloba have differentiated some special architectural features adapted for pollen capture and transport that may improve wind pollination efficiency at the female level. Expand
Developmental synchronization of male and female gametophytes in Ginkgo biloba and its neck mother cell division prior to fertilization.
TLDR
This study investigated male and female gametophytes in Ginkgo biloba, while a droplet of fluid was present in the fertilization chamber and found that the central cell, the generative cell and the neck mother cell divided simultaneously prior to fertilization, suggesting that the gamets undergo a synchronization process to become receptive at the time of fertilization. Expand
Bipolar pollen germination in blue spruce (Picea pungens)
TLDR
It is concluded that mechanical properties of the cell wall and turgor pressure could shift the balance towards one of the germination patterns. Expand
The Evolution of Sexual Fluids in Gymnosperms From Pollination Drops to Nectar
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… Expand
Oviposition strategies of conifer seed chalcids in relation to host phenology
TLDR
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. Expand
Structure and function of the tentpole in the reproductive process of Ginkgo biloba L.
TLDR
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. Expand
Updating embryonic ontogenesis in Araucaria angustifolia: from Burlingame (1915) to the present
TLDR
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. Expand
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References

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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. Expand
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TLDR
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TLDR
The small number of archegonia often present, the high incidence of self-pollination, which may have been the cause of the high frequency of early embryo abortion, and the failure of basal and distal ... Expand
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TLDR
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TLDR
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