Table 1. Concentration of Ca2+ and Mg2+ in exudate collected from
the basal stump of 23-d-old tomato seedlings sprayed with different
concentrations of ~(+)-adenosine 5 s prior to being severed just
below the cotyledonary node
Each observation is the mean of 20-pL samples from two plants
(40 ML) in each of three replicates. The F value for the quadratic
trends of 'Ca2+ and Mg2+ with L(+)-adenosine concentration is significant
at P 5 0.01.