When.com Web Search

Search results

  1. Results From The WOW.Com Content Network
  2. Germination - Wikipedia

    en.wikipedia.org/wiki/Germination

    Once the pollen grain lands on the stigma of a receptive flower (or a female cone in gymnosperms), it takes up water and germinates. Pollen germination is facilitated by hydration on the stigma, as well as by the structure and physiology of the stigma and style. [2] Pollen can also be induced to germinate in vitro (in a petri dish or test tube ...

  3. Pollen tube - Wikipedia

    en.wikipedia.org/wiki/Pollen_tube

    Once the pollen grain is recognized and hydrated, the pollen grain germinates to grow a pollen tube. [11] There is competition in this step as many pollen grains may compete to reach the egg. The stigma plays a role in guiding the sperm to a receptive ovule, in the case of many ovules. [11]

  4. Plant embryonic development - Wikipedia

    en.wikipedia.org/wiki/Plant_embryonic_development

    Embryos that result from this mechanism can germinate into fully functional plants. As mentioned, the embryo results from a single pollen grain. Pollen grains consists of three cells - one vegetative cell containing two generative cells. According to Maraschin et al., androgenesis must be triggered during the asymmetric division of microspores ...

  5. Double fertilization - Wikipedia

    en.wikipedia.org/wiki/Double_fertilization

    Once the pollen grain has matured, the anthers break open, releasing the pollen. The pollen is carried to the pistil of another flower, by wind or animal pollinators, and deposited on the stigma. As the pollen grain germinates, the tube cell produces the pollen tube, which elongates and extends down the long style of the carpel and into the ...

  6. Self-incompatibility - Wikipedia

    en.wikipedia.org/wiki/Self-incompatibility

    The best studied mechanisms of SI act by inhibiting the germination of pollen on stigmas, or the elongation of the pollen tube in the styles. These mechanisms are based on protein-protein interactions, and the best-understood mechanisms are controlled by a single locus termed S, which has many different alleles in the species population.

  7. Pollen - Wikipedia

    en.wikipedia.org/wiki/Pollen

    Pollen itself is not the male gamete. [4] It is a gametophyte, something that could be considered an entire organism, which then produces the male gamete.Each pollen grain contains vegetative (non-reproductive) cells (only a single cell in most flowering plants but several in other seed plants) and a generative (reproductive) cell.

  8. Tapetum (botany) - Wikipedia

    en.wikipedia.org/wiki/Tapetum_(botany)

    Polyploidy and polyteny can also be seen sometimes. The tapetum's unusually large nuclear constitution helps it provide nutrients and regulatory molecules to the forming pollen grains. The following processes are responsible for this: Endomitosis; Normal mitosis not followed by cytokinesis; Formation of restitution nuclei; Endoreduplication

  9. List of pollen sources - Wikipedia

    en.wikipedia.org/wiki/List_of_pollen_sources

    The worker bees in the colony mix dry pollen with nectar and/or honey with their enzymes, and naturally occurring yeast from the air. Workers then compact the pollen. storing each variety in an individual wax hexagonal cell , typically located within their bee brood nest. This creates a fermented pollen mix call beekeepers call 'bee bread'. Dry ...

  1. Related searches germination of pollen grains sucrose molecules are due to large pieces of light

    pollen grain germinationgerminating pollen tube
    pollen tube elongation processpollen tube diagram
    pollen tube growth