Definition of pollen tube. Meaning of pollen tube. Synonyms of pollen tube

Here you will find one or more explanations in English for the word pollen tube. Also in the bottom left of the page several parts of wikipedia pages related to the word pollen tube and, of course, pollen tube synonyms and on the right images related to the word pollen tube.

Definition of pollen tube

pollen tube
Spermatophyta Sper`ma*toph"y*ta, n. pl. [NL.; spermato- + Gr. ? plant.] (Bot.) A phylum embracing the highest plants, or those that produce seeds; the seed plants, or flowering plants. They form the most numerous group, including over 120,000 species. In general, the group is characterized by the marked development of the sporophyte, with great differentiation of its parts (root, stem, leaves, flowers, etc.); by the extreme reduction of the gametophyte; and by the development of seeds. All the Spermatophyta are heterosporous; fertilization of the egg cell is either through a pollen tube emitted by the microspore or (in a few gymnosperms) by spermatozoids. Note: The phrase ``flowering plants' is less distinctive than ``seed plants,' since the conifers, grasses, sedges, oaks, etc., do not produce flowers in the popular sense. For this reason the terms Anthrophyta, Ph[ae]nogamia, and Panerogamia have been superseded as names of the phylum by Spermatophyta.
Pollen tube
Pollen Pol"len, n. [L. pollen fine flour, fine dust; cf. Gr. ?] 1. Fine bran or flour. [Obs.] --Bailey. 2. (Bot.) The fecundating dustlike cells of the anthers of flowers. See Flower, and Illust. of Filament. Pollen grain (Bot.), a particle or call of pollen. Pollen mass, a pollinium. --Gray. Pollen sac, a compartment of an anther containing pollen, -- usually there are four in each anther. Pollen tube, a slender tube which issues from the pollen grain on its contact with the stigma, which it penetrates, thus conveying, it is supposed, the fecundating matter of the grain to the ovule.

Meaning of pollen tube from wikipedia

- A pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. Pollen tube elongation is an integral stage in...
- female cone of gymnosperms. If pollen lands on a compatible pistil or female cone, it germinates, producing a pollen tube that transfers the sperm to the...
- the pollen through the pollen tube to the ovule where the egg is fertilised. In flowering plants, two sperm cells are released from the pollen tube, and...
- the spores of fungi, ferns, bacteria, and the growth of the pollen tube from the pollen grain of a seed plant. Germination is usually the growth of a...
- In angiosperms, after the pollen grain (gametophyte) has landed on the stigma, it germinates and develops a pollen tube which grows down the style until...
- muscle cells, fibroblasts, epithelial cells, green algae, spores, and pollen tubes, among others, have been already reported to respond by either growing...
- expressed immediately after pollen development and during pollen germination and pollen-tube growth. About 60% of genes expressed in the sporophyte are...
- ovary. These tissues form a nutrient-rich cord for the growth of the pollen tube. When the pistil consists of several carpels, each of them may have a...
- 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...
- The pollen tube is produced by the single vegetative cell in the pollen grain, which p****es its cytoplasm, nucleus and two sperm cells into the tube. The...