Table I.

Levels of metabolites in plant cytosol; PFP and H⁺-PPase activities from different plants and experimental conditions used in this study

Plants and Conditions	Metabolites in Plant Cytosola				Enzyme Activity Level
	F1,6BP	Pi	Fru-6P	PPi	PFPb	H+-PPasec
	mm				milliunits g fresh wt-1
Wild-type plants	0.6	5	1	0.33	293-1,813	15-25
Antisense transformant plants (lower levels)	-	-	-	-	20-58	-
Experimental conditions (Figs. 1, 2, and 4)	-	-	-	-	0.5-60d	18-25d

^a The concentrations of F1,6BP, P_i, and F6P are those reported in the literature for plant cell cytosol (Rebeille et al., 1983; Ukaji and Ashihara, 1987; Weiner et al., 1987; Kubota and Ashihara, 1990; Davies et al., 1993; Stitt, 1998). ^b The PFP activities for wild-type and antisense transformant tobacco (Nicotiana tabacum) plants were taken from Nielsen and Stitt (2001) for antisense transformant potato (Solanum tuberosum) plants. Values are from Hajirezaei et al. (1994). ^c The H⁺-PPase activities for wild-type mung bean, tomato (Lycopersicon esculentum) fruit, and maize leaves were taken from Maeshima and Yoshida (1989), Milner et al. (1995), and Clayton et al. (1993), respectively. ^d The PFP and H⁺-PPase activities shown in this report were converted to milliunits per gram fresh wt^-1 computing the enzyme activity level (milliunits) present in 1 mL of reaction medium. This volume was converted to grams to obtain the activities shown.