6Bacon M A,Wilkinson S,Davies W J. pH-regulated leaf cell expansion in droughted plants is abscisic acid dependent. Plant Physiol,1998,118 :1507 1515.
7Wilkinson S, Davies W J. Xylem sap pH increase: A drought signal received at apoplastic face of the guard cell that involves the suppression of saturable abscisic acid uptake by the epidermal symplast. Plant Physiol. ,1997,113:559 - 573.
8Wilkinson S,Corlett J A,Oger L. Effects of xylem pH on transpiration from wild-type and flacca mutant tomato leaves..A vital role for abscisic acid in preventing excessive water loss even from well-watered plants. Plant Physiol. ,t998,117 :703-709.
