pollen tube


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pollen tube

n.
A slender tube that is formed by a pollen grain of a seed plant and penetrates the ovule, where it releases the male gametes.

pollen tube

n
(Botany) a hollow tubular outgrowth that develops from a pollen grain after pollination, grows down the style to the ovule, and conveys male gametes to the egg cell

pol′len tube`



n.
the tube that forms from a germinating pollen grain and grows toward the ovule, carrying male gametes with it.
[1825–35]

pollen tube

The slender tube formed by the pollen grain that penetrates an ovule after pollination and releases the male gametes.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pollen tube - (botany) a slender tubular outgrowth from a pollen grain when deposited on the stigma for a flowerpollen tube - (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
phytology, botany - the branch of biology that studies plants
plant part, plant structure - any part of a plant or fungus
References in periodicals archive ?
After the embryo sac in fertilized by the pollen tube, the ovule gradually turns into a seed, and the carpel becomes a fruit.
The pollen tube enters the opening of the ovule, the micropyle, and reaches the interior of the ovule to undergo spenn release and fertilization (Endress, 1996).
Recently pollen physiology especially germination and viability has received considerable attention for its application in plant breeding, conservation, adaptation and understanding of physiological behavior of fertilizing pollen grains, there are several reports on pollen germination, viability and tube length from different taxa [33,22,42,2314], but a little research concentrates on pollen tube morphology which is important also to complete fertilization successfully.
In Cretaceous flowers we've never before seen a fossil that shows the pollen tube actually entering the stigma," said George Poinar, Jr.
Sex for a plant happens when male pollen lands on the female part of a flower, called the stigma, and then grows a pollen tube down the style, which is attached to the stigma, to reach and fertilize an egg.
After a pollen grain lands on a receptive stigma of a pistil, a pollen tube germinates from the hydrated pollen grain and delivers the immotile sperm cells over a long distance toward the ovule.
Beneath the stigma is a tubular style, into which a pollen tube (growing out from a pollen grain) tunnels until it reaches the ovary and, finally, the ovule (egg) at the bottom of the style.
We are studying KCBP in the conifer pollen tube system of Norway spruce as a potential calcium regulated link between microfilaments and microtubules.
Equally important are the steps that lead to that fusion, such as the sprouting and elongating of the pollen tube.
The decision to use pollen grains resulted from the need in a previous semester to demonstrate pollen tube growth in an upper-level botany course.
Three adjacent stigmatic chambers provide growing pollen tubes access to one ovary; the remaining two stigmatic chambers provide pollen tube access to the second ovary (Sage et al.
S-RNases that inhibit pollen tube growth in incompatible crosses