what is the function of intine of a pollen grain?

The intine comes out through any one germ pore during the germination of pollen grain in the form of pollen tube.
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as intine is made up of cellulose and pectin it may protect the pollen grain.
this is because cellulose is hard.
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are u sure tanya?
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thnx
 
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@siri gurajapu , but sporopollenin is the most resistant material, why would it need cellulose for protection when it already has the exine ? 
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