pollen tube
Quick Summary
A pollen tube is a vital structure formed by a pollen grain after it lands on the stigma of a flower. This tube grows down through the pistil towards the ovule. Its primary function is to convey the sperm nuclei to the embryo sac within the ovule, enabling fertilization. This process is crucial for the sexual reproduction of flowering plants (angiosperms) and gymnosperms. The growth of the pollen tube is supported by secretions from the style, and it ultimately enters the ovule through the micropyle.123
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angiospermPollinationThe pollen tube ultimately enters an ovule through the micropyle and penetrates one of the sterile cells on either side of the egg (synergids). These synergids begin to degenerate immediately after pollination. Pollen tubes can reach great lengths, as in corn, where the corn silk consists…
Read MoreThe pollen tube ultimately enters an ovule through the micropyle and penetrates one of the sterile cells on either side of the egg (synergids). These synergids begin to degenerate immediately after pollination. Pollen tubes can reach great lengths, as in corn, where the corn silk consists…
Read More- angiospermPaleobotany and evolution
…result of insect pollination is pollen tube competition. When a pollen load of 50–200 pollen grains is deposited on a stigma at one time, each pollen grain grows a pollen tube into the stigmatic tissue. The pollen tubes that grow the fastest reach the ovules first and effect fertilization. It…
Read More…result of insect pollination is pollen tube competition. When a pollen load of 50–200 pollen grains is deposited on a stigma at one time, each pollen grain grows a pollen tube into the stigmatic tissue. The pollen tubes that grow the fastest reach the ovules first and effect fertilization. It…
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pollination…and gives rise to a pollen tube, which grows down through the pistil toward one of the ovules in its base. In an act of double fertilization, one of the two sperm cells within the pollen tube fuses with the egg cell of the ovule, making possible the development of…
Read More…and gives rise to a pollen tube, which grows down through the pistil toward one of the ovules in its base. In an act of double fertilization, one of the two sperm cells within the pollen tube fuses with the egg cell of the ovule, making possible the development of…
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