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the inner wall of the pollen grain extends outward through the germination hole (or groove) on the outer wall of the pollen. Generally each pollen grain germinates to produce a pollen tube, with a poly-germination hole pollen grain can start to grow several pollen tubes at the same time, but in the end only one continues to grow. Pollen tubes are grown by their ends, and a transparent heme area at the end of the pollen tube is visible under a high-fold
scope
called a cap area. The cytoste behind the cap area contains a variety of cytocytes, which are associated with the growth of pollen tubes. Pollen tube length to a certain length, the original pollen particles of the inclusions are all concentrated in the front end of the pollen tube, pollen tube from the column through the flower column to the sub-room, and then into the embryo beads and blastocyst, the pollen tube in the two sperm and all the inclusions released into the blastocyst, in order to fertilize the effect. Pollen tubes are part of the male lithosome.
