How pollen tube germinate over a stigma of a flower
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When a rose pollen grain lands on a stigma, it absorbs water and a rehydration process occurs. Various signals, especially those of pollen–stigma interaction, induce an intense metabolic activity in the pollen grain which start to grow and forms a pollen tube. The pollen tube invades the pistil, growing between the walls of the stigmatic cells, then traveling through an extracellular matrix within the transmitting tissue of the style. The pollen tube finally arrives at the ovary, where it is attracted to an ovule that contains an egg cell. This phase of pollen development, called the progamic phase, corresponds to the phase occurring between pollination and fertilization. In roses, the pollen tubes reach the ovules between 12 and 24 h after pollination.
As soon as pollen grain reached at stigma a chemical reaction take place in turn of that a pollen tube is created...
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