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How the pollen germination and compatibi...

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

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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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