A pollen tube is part of the male gametophyte of seed plants. It 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. In maize, this single cell can grow longer than 12 inches to travers...
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http://en.wikipedia.org/wiki/Pollen_tube
(from the article `angiosperm`) The pollen tube ultimately enters an ovule through the micropyle and penetrates one of the sterile cells on either side of the egg (synergids). These ... Another feature of flowers that developed as a result of insect pollination is pollen-tube competition. When a pollen load of 50–200 pollen grains ...
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http://www.britannica.com/eb/a-z/p/88
A tube formed after germination of a pollen grain. The pollen tube carries the male gametes into the ovule (egg). In flowering plants each pollen tube penetrates the tissues of the stigma and style on its way to the ovary. After entering the ovary, each pollen tube grows toward an ovule, passing dow...
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http://www.daviddarling.info/encyclopedia/P/pollen_tube.html
In seed plants, the extension of the male gametophyte as it emerges from the pollen grain in search of the female gametophyte.
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http://www.ucmp.berkeley.edu/glossary/gloss8botany.html
In seed plants, the extension of the male gametophyte as it emerges from the pollen grain in search of the female gametophyte.
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http://www.ucmp.berkeley.edu/glossary/glossary_8.html
[
n] - slender tubular outgrown from a pollen grain that penetrates the ovule and releases male gametes
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http://www.webdictionary.co.uk/definition.php?query=pollen%20tube
noun (botany) a slender tubular outgrowth from a pollen grain when deposited on the stigma for a flower; it penetrates the style and conveys the male gametes to the ovule
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https://www.encyclo.co.uk/local/20974
A long, hollow tube formed by the pollen grain
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https://www.encyclo.co.uk/local/22581
No exact match found.
