( Additionally ( , ( gibberellins ( ( play ( ( a role ) ( in ( root ( ( growth and ) differentiation ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Additionally)) (, ,) (NP (NNS gibberellins)) (VP (VBP play) (NP (NP (DT a) (NN role)) (PP (IN in) (NP (NN root) (NN growth) (CC and) (NN differentiation))))) (. .)))
Additionally, gibberellins play a role in root growth and differentiation.
(ROOT (S (NP (JJ Young) (NNS roots) (CC and) (NNS leaves)) (VP (VBP are) (NP (NP (DT the) (JJ major) (NNS sites)) (PP (IN of) (NP (NN gibberellin) (NN production))))) (. .)))