- the protoplasmic tube that is extruded from a germinating pollen grain and grows toward the ovule.
Origin of pollen tube
First recorded in 1825–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for pollen tube
The pollen-tube is constant because it has proved to be indispensable.Darwin and Modern Science
A.C. Seward and Others
The male-cells are carried to their destination in the tip of the pollen-tube.
The pollen-tube must penetrate the whole length of each thread of corn-silk in order to reach the ovules.
It is down these style-branches that the pollen-tube passes on its way to the ovules or embryo seeds.The Apple-Tree
L. H. Bailey
The branches of the stigma are very thin, formed apparently of three rows of cells of hardly greater diameter than pollen-tube.More Letters of Charles Darwin Volume II
- 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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- The slender tube that is formed after pollination by division of the tube cell in a pollen grain. The pollen tube penetrates the ovule and releases the male gametes.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.