( ( ( ( leaf , ) branch ) , ) ( ( ( ( stem and ) root ) ( net ( primary ( ( production and ) respiration ) ) ) ) ; ) )
(ROOT (S (NP (NP (NN leaf)) (, ,) (NP (NN branch)) (, ,)) (VP (VBP stem) (CC and) (VBP root) (NP (JJ net) (JJ primary) (NN production) (CC and) (NN respiration))) (: ;)))
leaf, branch, stem and root net primary production and respiration;
(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))))) (. .)))