Pollen tube - 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 the plant life cycle.
Pollen tube | plant anatomy | Britannica
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 synergids begin to degenerate immediately after pollination. Pollen tubes can reach great lengths, as in …
Mechanics of Pollen Tube Elongation: A Perspective - Frontiers
2020年10月19日 · The pollen tube (PT) is a unique and specialized structure in plants. Its sole purpose is to deliver sperm cells to the female gametophyte for double fertilization. Essentially, it is a thread–like structure spanning from the pollen shell toward the tip.
Pollen tube - Simple English Wikipedia, the free encyclopedia
The pollen tube is the tube through which sperm from the pollen reaches the egg cell, and fertilises the plant to form seeds. The pollen tube of most seed plants acts as a passageway. It transports sperm cells from the pollen grain, from the stigma (in flowering plants) to the ovules at the base of the pistil.
Pollen Tube - an overview | ScienceDirect Topics
Pollen tubes are the fastest growing cells in nature with elongation rates of > 20 μm min − 1. The pollen tubes grow as fast as possible through the stigma tissue towards the egg cells where they release two sperm cells for fertilization.
Pollen tube growth and guidance: roles of small, secreted proteins
In Lilium longiflorum pollination, growing pollen tubes utilize two critical mechanisms, adhesion and chemotropism, for directional growth to the ovules.
The Diversity of the Pollen Tube Pathway in Plants: Toward an ...
2016年2月8日 · Here we examine these differences, paying especial attention to the interaction between the male gametophyte and the female sporophyte during the different steps of the pollen tube pathway.
How pollen tubes grow - ScienceDirect
2007年3月15日 · During pollen tube growth, actin microfilaments, and probably microtubules, provide biological framework for heavy vesicular trafficking, as well as mechanical support, toward the elongating pollen tip. The corresponding molecular motors – myosin, dyneins, and kinesins – mobilize transport vesicles laden with cell wall materials.
6.6: Stimulating Pollen Tube Growth - Biology LibreTexts
Pollen is the microgametophyte in both gymnosperms and angiosperms. Recall that conifer pollen has four cells and inflated air sacs that serve as wings. In angiosperms, the pollen lacks wings and is reduced to only two cells: the generative cell and the tube cell. Below are two microgametophytes.
Pollen Tube - an overview | ScienceDirect Topics
The pollen-tube pathway method was first proposed in 1983 (Zhou et al., 1983) by exploiting the germplasm cells of the plant's own reproductive system. Its principle is to use pollen tube channels to introduce foreign DNA into the embryo sac and transform egg cells, zygotes, or early embryonic cells that do not yet have normal cell walls (Fig ...
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