Table 2.

Redistribution of heavy label following glucose feeding of control and treated Arabidopsis leaves.

	Control	SP	CESP
	μmol C1 equivalent g−1 FW h−1
Alanine	4.837 ± 1.248	3.989 ± 0.578	4.417 ± 0.707
Asparagine	0.129 ± 0.042	0.117 ± 0.004	0.124 ± 0.014
Aspartate	0.085 ± 0.020	0.060 ± 0.014	0.075 ± 0.015
Fructose	0.479 ± 0.032	0.388 ± 0.107	0.613 ± 0.074
Fumarate	0.231 ± 0.068	0.114 ± 0.013	0.143 ± 0.066
GABA	0.077 ± 0.006	0.115 ± 0.006	0.971 ± 0.007
Glutamate	1.199 ± 0.172	1.712 ± 0.163	1.591 ± 0.134
Glutamine	0.931 ± 0.134	0.679 ± 0.097	0.663 ± 0.180
Histidine	0.992 ± 0.139	0.859 ± 0.045	0.887 ± 0.118
Isoleucine	0.018 ± 0.005	0.015 ± 0.003	0.012 ± 0.003
Lysine	1.477 ± 0.221	1.036 ± 0.128	1.167 ± 0.136
Malate	2.174 ± 0.166	1.522 ± 0.158	1.408 ± 0.206
Methionine	0.044 ± 0.001	0.046 ± 0.001	0.049 ± 0.001
Ornithine	0.364 ± 0.108	0.073 ± 0.015	0.063 ± 0.020
2-Oxoglutarate	0.320 ± 0.168	0.391 ± 0.035	0.383 ± 0.126
Proline	0.029 ± 0.012	0.001 ± 0.001	0.002 ± 0.001
Serine	0.115 ± 0.022	0.087 ± 0.014	0.088 ± 0.018
Sucrose	1.323 ± 0.134	1.184 ± 0.326	1.197 ± 0.255
Valine	0.449 ± 0.109	0.325 ± 0.054	0.341 ± 0.061

Fully expanded leaves of 4-week-old plants were harvested at the middle of the light period, washed three times with 10 mM MES-KOH (pH 6.5), and then incubated during 4 h in similar light growth conditions in 10 mM MES-KOH buffer (pH 6.5) containing 20.0 [U-¹³C] mM glucose and 100 μM of SP or CESP. Values represent absolute redistribution of the label and are given as means ± SE of determinations on six independent samples. Those set in bold type were determined by the Student’s t-test to be significantly different (P < 0.05) from the control.