Table 2.

PI-II accumulation in grafted tomato plants in response to a long-distance signal generated in a 35S∷prosystemin transgenic line

Graft combination (scion/stock)	PI-II, μg/ml of leaf juice
	Scion	Stock
WT/WT	12  ± 7	18  ± 14
35S∷PS/35S∷PS	229  ± 14	304  ± 45
WT/35S∷PS	140  ± 36	252  ± 61
spr-2/WT	14  ± 7	16  ± 9
spr-2/35S∷PS	150  ± 12	263  ± 10
jai-1/WT	0	30  ± 11
jai-1/35S∷PS	0	279  ± 11

Tomato plants (5 weeks old) were grafted in the indicated combinations. Three weeks after grafting, PI-II accumulation was measured in three plants of each graft combination. PI-II levels were determined by using three leaflets per leaf. Values represent the mean PI-II concentration of three plants per combination ± SD. 35S∷PS, transgenic line that overexpresses prosystemin from a 35S∷prosystemin transgene.