<P> The tannin compounds are widely distributed in many species of plants , where they play a role in protection from predation , and perhaps also as pesticides , and might help in regulating plant growth . The astringency from the tannins is what causes the dry and puckery feeling in the mouth following the consumption of unripened fruit or red wine or tea . Likewise , the destruction or modification of tannins with time plays an important role when determining harvesting times . </P>
what is the use of tannin in plant
protection from predation as pesticides regulating plant growth