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  Encyclopedia of Keywords > Pollen Tube > Pollen Grain   Michael Charnine

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    This Review contains major "Pollen Grain"- related terms, short phrases and links grouped together in the form of Encyclopedia article.


  1. The pollen grain is actually the male gametophyte generation of seed plants (see reproduction). (Web site)
  2. The pollen grain was considered viable if it turned deep pink. (Web site)
  3. From each pollen grain, a pollen tube grows out attempting to travel into the ovary by creating a path through the female tissue. (Web site)
  4. Before a pollen grain is shed, the cell inside divides to form the male gametophyte. (Web site)

Germinated Pollen Grain

  1. The germinated pollen grain with its two sperm cells is the mature male microgametophyte of these plants. (Web site)

Sperm Nuclei

  1. Each pollen grain contains two sperm nuclei and one tube nucleus. (Web site)


  1. The vegetative (or tube) and generative nuclei of the pollen grain pass into its respective pollen tube. (Web site)

Strong Bases

  1. The outer layer of a pollen grain is very resistant to disintegration; treatment with intense heat, strong acids, or strong bases has little effect on it. (Web site)

Pollen Tube

  1. Each pollen grain has two haploid cells: a generative cell that divides to form two sperm and a tube cell that produces a pollen tube. (Web site)

Flowering Plants

  1. In flowering plants, the male gamete is produced inside the pollen grain through the division of a generative cell into two sperm nuclei. (Web site)

Male Gametophyte

  1. The male gametophyte develops inside the pollen grain. (Web site)
  2. The male gametophyte is the mature pollen grain. (Web site)


  1. Angiosperm male gametophytes have two haploid nuclei (the germ nucleus and tube nucleus) contained within the exine of the pollen grain (or microspore). (Web site)
  2. Spermatophytes thus have evolved their male gamete within a spore, the microspore or pollen grain. (Web site)
  3. Each microspore then divides mitotically to form an immature microgametophyte called a pollen grain.


  1. For example, the pollen grain s of flowering plants develop out of microspores produced in the anther s.


  1. In some species, self-recognition activates a signal transduction pathway in epidermal cells that prevents germination of the pollen grain. (Web site)
  2. Germination is the growth of a tube from the surface of a pollen grain. (Web site)


  1. Endosperm is formed when the two sperm inside a pollen grain reach the interior of an ovary.


  1. Another germination event during the life cycle of gymnosperms and flowering plants is the germination of a pollen grain after pollination. (Web site)
  2. In gymnosperms and angiosperms, sperm do not need water for mobility but are carried to the female reproductive organs in the pollen grain. (Web site)
  3. Once the pollen grain lands on the stigma of a receptive flower (or a female cone in gymnosperms), it takes up water and germinates. (Web site)

Sperm Cells

  1. As the pollen grain germinates, the pollen tube elongates, and the generative cell undergoes mitosis, producing two sperm cells. (Web site)
  2. The germ cell in the pollen grain divides and releases two sperm cells which move down the pollen tube. (Web site)
  3. Each microspore undergoes two subsequent mitotic divisions to produce one vegetative cell and two sperm cells in the mature pollen grain. (Web site)


  1. After fertilization by a sperm contained in a pollen grain, the zygote develops into the embryo, contained in the seed. (Web site)
  2. Fertilization of an egg within a carpel by a pollen grain from another flower results in seed development within the carpel. (Web site)


  1. The drupelets only develop around ovules that are fertilized by the male gamete from a pollen grain. (Web site)


  1. In the flower, the pollen tube then grows towards the ovule where it discharges the sperm produced in the pollen grain for fertilization. (Web site)
  2. When a pollen grain lands on a stigma of the same species, it grows a tube into the ovule (seed-forming structure). (Web site)


  1. These microspores are now called pollen, and each pollen grain is an immature male gametophyte.


  1. The pollen tube acts as a conduit to transport sperm cells from the pollen grain, which has landed on the stigma, to the ovules at the base of the pistil. (Web site)
  2. The stigma receives pollen grain, which upon germination, produces a pollen tube which passes through the stigma into the ovary.
  3. In most species, this occurs after the pollen grain lands on the stigma of the carpel and the pollen tube begins to form. (Web site)

Female Gametophyte

  1. The pollen grain germinates and grows as a pollen tube into the ovule, where it delivers one or two sperm into the female gametophyte. (Web site)
  2. When a pollen grain lands near a female gametophyte, it undergoes fertilization of the female gametophyte.

Embryo Sac

  1. Endosperm is formed when the two sperm inside a pollen grain reach the interior of an embryo sac or female gametophyte.
  2. In flowering plants the gametophytes are so reduced (pollen grain and embryo sac) that distinct structures are not found. (Web site)
  3. If the pollen grain lands on a compatible stigma, a pollen tube will grow so that eventually the egg cell, hidden away in the embryo sac, can be fertilised.

Pollen Grain

  1. The stigma is the receptive tip of the carpel, which receives pollen at pollination and on which the pollen grain germinates. (Web site)
  2. Each female gametophyte develops two egg cells, both of which are fertilized by a male gamete from a pollen grain. (Web site)
  3. Endosperm is formed when the two sperm nuclei inside a pollen grain reach the interior of an embryo sac or female gametophyte. (Web site)


  1. Pollen Tube
  2. Embryo Sac
  3. Female Gametophyte
  4. Stigma
  5. Botany > Plants > Pollination > Ovule
  6. Books about "Pollen Grain" in

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  Short phrases about "Pollen Grain"
  Originally created: April 04, 2011.
  Links checked: June 27, 2013.
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