( ( Water potential ) ( ( is ( measured ( in ( ( units ( of ( pressure ( called megapascals ) ) ) ) ( -LRB- ( MPa -RRB- ) ) ) ) ) ) ; ) )
(ROOT (S (NP (NNP Water) (NN potential)) (VP (VBZ is) (VP (VBN measured) (PP (IN in) (NP (NP (NNS units)) (PP (IN of) (NP (NN pressure) (VBN called) (NNS megapascals))) (PRN (-LRB- -LRB-) (NP (NNP MPa)) (-RRB- -RRB-)))))) (: ;)))
Water potential is measured in units of pressure called megapascals (MPa);
(ROOT (S (NP (NNS Megapascals)) (VP (VBZ is) (NP (NP (DT the) (NN measure)) (PP (IN of) (NP (NN water) (NN potential))))) (. .)))