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Enzyme activities were determined in leaf extracts, because in our view this method provides reliable data on the enzyme activity ratios in vivo. A leaf sample (1¨C1.5 g) was fixed with liquid nitrogen and ground in a mortar. An extracting medium (8¨C10 ml) containing 50 mM Hepes¨CNaOH (pH 7.5), 5 mM MgCl2, 1 mM EDTA, 2.5 mM dithiothreitol, and 0.5% BSA was gradually added during grinding. The homogenate was filtered through eight layers of cheesecloth and centrifuged at 20000 g for 15 min. The supernatant was dialyzed for 3 h against a tenfold volume of the extracting medium diluted 2.5 times (this medium was free of BSA but contained 10 mM 2-mercaptoethanol). After dialysis, the extract was used as an enzyme preparation.All procedures were performed at 4¡æ.

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