All the events which occur from the time of pollen deposition on the stigma until the entry of the pollen tube in to the ovule are together called as pollen pistil interaction .
It is a dynamic process and involves pollen recognition by stigma for compatible pollen .
The wrong type compatible pollen or the sterile pollen are rejected by the pistil and it does not allow the growth of pollen tube.
The right type or compatible pollen are encouraged by pistil for growth and development of pollen tubes .
After growth the pollen tubes moves towords the style toreach the ovary .
Then it enters in to embryusec of the ovule through micropylar end reach the synergid guided by filliform apparatus .
Pollen pistil interaction maintains the stability of the species and permits the reasonable degree of genetic variability with in reasonable degree of genetic variability with in the species
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