Untersuchungen über den Zusammenhang zwischen der Aktivität der Saccharose-6-Phosphat-Synthetase und den Nettophotosyntheseraten sowie den Saccharose- und Stärkegehalten der Blätter von Solatium melongena L.

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Summary Growing fruit strongly influenced sucrose-phosphate synthetase (UDP-glucose: D-fructose-6-phosphate 2-glucosyltransferase EC 2.4.1.14) activity, net photosynthetic rates, and sucrose and starch content of leaves of eggplants ( Solatium melongena L.). On the contrary flowers and mature fruit did not influence assimilate production or enzyme activity. Removal of growing fruit caused a decrease of sucrose-phosphate synthetase activity and net photosynthetic rates. The sucrose concentration in leaves increased but decreased again some days after fruit was removed. On the other hand starch content remained above values measured in leaves of plants bearing fruit. The role of sucrose phosphate synthetase in source-sink relationship is discussed.