( ( ( The ( TNC increment ) ) ( in ( ( the roots ) ( during spring ) ) ) ) ( ( was ( largely ( due ( to ( ( a ( marked increase ) ) ( in ( ( ( sucrose concentration ) , ) ( ( the ( main ( transport ( carbohydrate fraction ) ) ) ) ( -LRB- ( ( ( Kozlowski and ) ( Keller 1966 ) ) -RRB- ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNP TNC) (NN increment)) (PP (IN in) (NP (NP (DT the) (NNS roots)) (PP (IN during) (NP (NN spring)))))) (VP (VBD was) (ADJP (RB largely) (JJ due) (PP (TO to) (NP (NP (DT a) (JJ marked) (NN increase)) (PP (IN in) (NP (NP (JJ sucrose) (NN concentration)) (, ,) (NP (NP (DT the) (JJ main) (NN transport) (NN carbohydrate) (NN fraction)) (PRN (-LRB- -LRB-) (NP (NP (NNP Kozlowski)) (CC and) (NP (NNP Keller) (CD 1966))) (-RRB- -RRB-))))))))) (. .)))
The TNC increment in the roots during spring was largely due to a marked increase in sucrose concentration, the main transport carbohydrate fraction (Kozlowski and Keller 1966 ).
(ROOT (S (NP (NNS Plants)) (ADVP (RB generally)) (VP (VB transport) (NP (NNS carbohydrates)) (PP (IN from) (NP (NP (NP (NNS leaves)) (PP (TO to) (NP (NNS roots)))) (CC and) (NP (NP (JJ other) (JJ nonphotosynthetic) (NNS organs)) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NN sucrose))))))))) (. .)))