Apoplastic expression of yeast-derived invertase in potato. Effects on photosynthesis, leaf solute composition, water relations, and tuber composition. - Heineke,D..; Sonnewald,U..; Büssis,D..; Günter,G..; Leidreiter,K..; Wilke,I..; Raschke,K..; Willmitzer,L..; Heldt,H..W.. (Plant Physiol., 1992)