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  2. Pollen - Wikipedia

    en.wikipedia.org/wiki/Pollen

    Pollen tube diagram. Pollen is a powdery substance produced by most types of flowers of seed plants for the purpose of sexual reproduction. [1] It consists of pollen grains (highly reduced microgametophytes), which produce male gametes (sperm cells).

  3. Pollen tube - Wikipedia

    en.wikipedia.org/wiki/Pollen_tube

    Pollen tube elongation is an integral stage in the plant life cycle. The pollen tube acts as a conduit to transport the male gamete cells from the pollen grain—either from the stigma (in flowering plants) to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms.

  4. Tapetum (botany) - Wikipedia

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

    The tapetum is a specialised layer of nutritive cells found within the anther of flowering plants, located between the sporogenous tissue and the anther wall. Tapetum is important for the nutrition and development of pollen grains and a source of precursors for the pollen coat. [ 1 ]

  5. Microgametogenesis - Wikipedia

    en.wikipedia.org/wiki/Microgametogenesis

    These cells are surrounded by a wall of sterile cells called the tapetum, which supplies food to the cell and eventually becomes the cell wall for the pollen grain. These sets of sporogenous cells eventually develop into diploid microspore mother cells. These microspore mother cells, also called microsporocytes, then undergo meiosis and become ...

  6. 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 ...

  7. Microspore - Wikipedia

    en.wikipedia.org/wiki/Microspore

    Four chambers (pollen sacs) lined with nutritive tapetal cells are visible by the time the microspores are produced. After meiosis, the haploid microspores undergo several changes: The microspore divides by mitosis producing two cells. The first of the cells (the generative cell) is small and is formed inside the second larger cell (the tube cell).

  8. Floral morphology - Wikipedia

    en.wikipedia.org/wiki/Floral_morphology

    The pollen tubes, in this case, grow between the cells of the transmission tissue (as in the case of Petunia, [21]) or through cell walls (as in Gossypium, [22]). The transmission tissue in solid styles includes an intercellular substance containing pectin , comparable to the mucilage found in the stylar canal of hollow styles.

  9. Gynoecium - Wikipedia

    en.wikipedia.org/wiki/Gynoecium

    The central cell, once fertilized by a sperm cell from the pollen becomes the first cell of the endosperm, and the egg cell once fertilized become the zygote that develops into the embryo. The gap in the integuments through which the pollen tube enters to deliver sperm to the egg is called the micropyle. The stalk attaching the ovule to the ...