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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.
One prime example of chemotropism is seen in plant fertilization and pollen tube elongation of angiosperms, flowering plants. [4] Unlike animals, plants cannot move, and therefore need a delivery mechanism for sexual reproduction. Pollen, which contains the male gametophyte is transferred to another plant via insects or wind. [5]
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).
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.
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Pollen Exo-PGs play a role in enabling pollen tube elongation since pectin rearrangement is necessary for the growth of pollen tubes . This PG activity has been found in grasses like maize as well as in trees, particularly in the Eastern cottonwood . [ 19 ]
English: This is a diagram of cell elongation in plants. In sum, acidity in the cell wall causes the cell wall to become more flexible. Then, an influx of water into the vacuole of the plant cell will cause the plant cell to lengthen due to the cell wall flexibility.
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