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pollen tube वाक्य

"pollen tube" हिंदी मेंpollen tube in a sentence
उदाहरण वाक्यमोबाइल
  • A pollen tube is produced, which grows into the nucellus to provide nutrients for the developing sperm cells.
  • Plants that are self-sterile often inhibit the pollen grains from their own flowers from growing pollen tubes.
  • The presence of multiple grains of pollen has been observed to stimulate quicker pollen tube growth in some plants.
  • Stigma have been shown to assist in the rehydration of pollen and in promoting germination of the pollen tube.
  • In this example, pollen tube incompatibility and slower generative mitosis have been implicated in the post-pollination isolation mechanism.
  • The pollen tube elongates and pierces and grows through the megasporangium wall and delivers the sperm cells to the female gametophyte inside.
  • In oaks, early fertilized ovules prevent the fertilization of other ovules by inhibiting the pollen tube entry into the embryo sac.
  • Thus, kin recognition at the level of the pollen tube apparently leads to post-pollination selection to avoid inbreeding depression.
  • Exo-PGs play a role in enabling pollen tube elongation since pectin rearrangement is necessary for the growth of pollen tubes.
  • Exo-PGs play a role in enabling pollen tube elongation since pectin rearrangement is necessary for the growth of pollen tubes.
  • Tip growth is a process that has many similarities in diverse walled cells such as pollen tubes, root hairs, and hyphae.
  • In the flower, the pollen tube then grows towards the ovule where it discharges the sperm produced in the pollen grain for fertilization.
  • It has been suggested that the pollen expression of pectate lyase genes might relate to a requirement for pectin degradation during pollen tube growth.
  • Use of these devices may aid our understanding pollen tube guidance and the mechanism of sexual reproduction in " A . thaliana ."
  • The vegetative cell then produces the pollen tube, a tubular protrusion from the pollen grain, which carries the sperm cells within its cytoplasm.
  • An example of chemo-tropic movement can be seen during the growth of the pollen tube, where growth is always towards the ovules.
  • Fertilization of flowers by pollen is achieved because the ovary releases chemicals that produce a positive chemo-tropic response from the developing pollen tube.
  • No style exists, but a broad stigmatic crest along the margin allows pollen tubes access along the surface and between hairs at the margins.
  • When a pollen grain makes contact with the female stigma, the pollen grain forms a pollen tube that grows down the style into the ovary.
  • The main donors to the pathway were the genes associated with the arbuscular mycorrhiza symbiosis genes, the pollen tube formation genes and the haemoglobin genes.
  • अधिक वाक्य:   1  2  3

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