Sexual Reproduction of Interior Spruce (Pinaceae). II. Fertilization to Early Embryo Formation

@article{Runions1999SexualRO,
  title={Sexual Reproduction of Interior Spruce (Pinaceae). II. Fertilization to Early Embryo Formation},
  author={C. John Runions and John N. Owens},
  journal={International Journal of Plant Sciences},
  year={1999},
  volume={160},
  pages={641 - 652}
}
Stages of normal sexual reproduction between pollen tube penetration of the archegonium and early embryo formation are described for interior spruce. These pre‐ and postzygotic stages were studied by light and electron microscopy in more detail than was possible in previous studies, and new observations have been made. The pollen tube tip penetrates between the neck cells toward the deteriorating ventral canal cell, and sperm (male gametes) and accompanying cytoplasm are released into the egg… Expand
Sexual Reproduction of Interior Spruce (Pinaceae). I. Pollen Germination to Archegonial Maturation
TLDR
Stages of normal sexual reproduction between pollen germination and egg maturation are described for interior spruce and sperm (male gametes) formation and the organelles that accompany the sperm within the pollen tube are described. Expand
Paternal cytoplasmic transmission in Chinese pine (Pinus tabulaeformis)
TLDR
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
Western white pine (Pinus monticola Dougl.) reproduction: II. Fertilisation and cytoplasmic inheritance
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Fertilisation and proembryo development are described from transmission electron micrographs emphasising the origin and fate of the maternal and paternal mitochondria and plastids, consistent within the Pinaceae but differs from some other conifer families. Expand
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The synchronized development from meiosis of the pollen mother cell to mature pollen together with frequent insect damage to the pollen cones might be a possible cause of frequent low pollen production in this species. Expand
Male Gametophyte Development and Evolution in Extant Gymnosperms
The male gametophytes of gymnosperms are characterized by the diversities in pollen morphology, cellular composition and pattern of cell division, pollen tube morphology, sperm delivery, growthExpand
Growth and development of conifer pollen tubes
Conifer pollen tubes are an important but underused experimental system in plant biology. They represent a major evolutionary step in male gametophyte development as an intermediate form between theExpand
Polyspermy barriers in plants: from preventing to promoting fertilization
TLDR
Evidence is presented suggesting that a polyspermy block on the egg may be part of the mechanism that promotes faithful double fertilization in plants. Expand
Structure and function of the neck cell during fertilization in Ginkgo biloba L.
Key messageNeck cells inGinkgo bilobacontribute to archegonial opening through morphological changes and might be involved in the production of fertilization liquid to attract spermatozoids towardExpand
Occurrence of unique three-celled megagametophyte and single fertilization in an aquatic angiosperm-Dalzellia zeylanica (Podostemaceae-Tristichoideae)
TLDR
The present work not only highlights the highly reduced nature of megagametophyte but also the occurrence of single fertilization resulting in sperm selection in D. zeylanica. Expand
Development of polyspermic zygote and possible contribution of polyspermy to polyploid formation in angiosperms
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Polyspermic plant zygotes have the potential to form triploid embryos, and that polyspermy in angiosperms might be a pathway for the formation of triploids plants. Expand
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References

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TLDR
Stages of normal sexual reproduction between pollen germination and egg maturation are described for interior spruce and sperm (male gametes) formation and the organelles that accompany the sperm within the pollen tube are described. Expand
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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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The anatomy and phenology of sexual reproduction of Picea engelmannii Parry from three sites near Prince George, B.C., has been described. The developmental stages at the higher elevation andExpand
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Postdormancy development of the ovule, fertilization, and embryo and seed development of Pinus contorta (Dougl.) are described and Stages of the reproductive cycle as they affect potential seed production are discussed. Expand
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