Is the germination of the pollen tube. Pollen
The inner wall prominent, pollen exine through the Germination hole
(or channel) extending outwardly from the thin tubular structure formed by germination hole. The main role is to carry the sperm and transported to other contents Egg apparatus
or Egg cell
In order to fertilization.
Pollen tube brief introduction Pollen
The inner wall of the outer wall of the pollen Germination hole
(or channel) extending outwards from the tube.
The average pollen germination when producing a pollen tube, with multiple apertures of the pollen grains began to grow at the same time can be a number of pollen tube, only one will continue to grow. The pollen tube growth depends on its end, at high magnification microscope tube end has a transparent hemispherical region of said cap region. Contains a variety of organelles in the cytoplasm after the cap region, which is related to the growth of pollen tube. The pollen tube to a certain length, the original contents of pollen grains in all the focus to the tip of the pollen tube, the pollen tube from the stigma style
To the ovary, and then enter the ovule
and embryo sac
In two, the pollen tube sperm
And all the contents released to embryo sac
In order to Fertilization
The. The pollen tube is a part of male gametophyte.
Pollen tube The use of Technology pollen-tube pathway
Is containing the target gene to the ovary injection after pollination DNA
The solution, using plants in the flowering and fertilization of pollen tube formed in the process of the Exogenous DNA
Into the fertilized egg cell, and further to be integrated into the receptor cell genome, with the development of the fertilized egg has genetically engineered new individual. This method in early 80s by Chinese scholars Guang Yu Zhou
Present, our country is now promoting the largest area of transgenic cotton is cultivated by pollen tube pathway. The biggest advantage of this method is not dependent on artificial regeneration, cultivation technology is simple, do not need a well-equipped laboratory, conventional breeding workers easy to master.