( ( ( The ( rooted petiole ) ) ( of ( a leaf ) ) ) ( ( can ( be ( used ( as ( ( a ( root stock ) ) ( in ( ( the production ) ( of grafts ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ rooted) (NN petiole)) (PP (IN of) (NP (DT a) (NN leaf)))) (VP (MD can) (VP (VB be) (VP (VBN used) (PP (IN as) (NP (NP (DT a) (NN root) (NN stock)) (PP (IN in) (NP (NP (DT the) (NN production)) (PP (IN of) (NP (NNS grafts)))))))))) (. .)))
The rooted petiole of a leaf can be used as a root stock in the production of grafts.
(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))))) (. .)))