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Related Concept Videos

Fertilization01:38

Fertilization

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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Cleavage and Blastulation01:33

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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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Meiosis II01:57

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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Meiosis II02:02

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Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
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The Angiosperm Life Cycle02:39

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Plants have a life cycle split between two multicellular stages: a haploid stage—with cells containing one set of chromosomes—and a diploid stage—with cells containing two sets of chromosomes. The haploid stage is the gamete-producing gametophyte, and the diploid stage is the spore-producing sporophyte.
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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Evaluation of Fertilization State by Tracing Sperm Nuclear Morphology in Arabidopsis Double Fertilization
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Evaluation of Fertilization State by Tracing Sperm Nuclear Morphology in Arabidopsis Double Fertilization

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Three Cell Fusions during Double Fertilization.

Stefanie Sprunck1, Thomas Dresselhaus1

  • 1Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, 93053 Regensburg, Germany.

Cell
|May 11, 2015
PubMed
Summary
This summary is machine-generated.

Flowering plants exhibit a unique third cell fusion after fertilization. This event in Arabidopsis rapidly dilutes pollen tube attractants, preventing multiple pollen tube entries (polytubey).

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Area of Science:

  • Plant reproductive biology
  • Molecular and cellular biology
  • Developmental biology

Background:

  • Flowering plants are distinguished by double fertilization, involving fusion with the egg and central cell.
  • Preventing multiple pollen tube entries (polytubey) is crucial for successful reproduction in plants.

Purpose of the Study:

  • To investigate potential cell fusion events beyond the canonical double fertilization in Arabidopsis.
  • To elucidate the mechanisms preventing polytubey following fertilization.

Main Methods:

  • Confocal microscopy in Arabidopsis thaliana.
  • Analysis of fluorescent protein localization and cell morphology.
  • Investigating pollen tube guidance signaling.

Main Results:

  • A novel third cell fusion event was identified between the persistent synergid and the fertilized central cell.
  • This fusion occurs shortly after double fertilization.
  • The fusion rapidly dilutes pollen tube attractants, effectively preventing polytubey.

Conclusions:

  • Arabidopsis possesses a previously undescribed mechanism involving a third cell fusion to ensure reproductive fidelity.
  • This synergid-central cell fusion plays a critical role in preventing polytubey, safeguarding the fertilization process.