No need to pluck them if they are not shriveled up and dead..Especially if there is nothing wrong with them deficiency wise and you know there is plenty of gas left in them..If you were looking to open up areas for light penetration then sure you could pluck leaves here and there,tuck'em,remove individual blades whatever..Like bush said, it can be genetics, ( my Double Grape has purple/reddish streaks through the mainstem and some leaf stems ) it can be temp related or nutrient related for example a phosphorus deficiency.If the leaf margins are perfectly fine and they are not indicating any problems,I would leave them.
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