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Question : How the pollen germination and compatibility is regulated by stigma of Gynoecium ?

Answer»

SOLUTION :The receptive surface of the stigma RECEIVE the pollen . If the pollen is compatible with the stigma it germinates to FORM a tube . This is facilitated by the stigmatic fluid in WET stigma and pellicle in DRY stigma. These two also decide the incompatibility and compatibility of the pollen through recognition - rejection protein reaction between the pollen and stigma surface.


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