Effect of TRIA on lon Pulse
Because TRIA elicits L(+)-adenosine production, it follows
that when the compounds are applied separately, the L(+)-
adenosine should act more rapidly than TRIA. When TRIA
or L(+)-adenosine was applied to the foliage of tomatoes and
the plants were excised at different times after application,
L(+)-adenosine caused a significant increase in Ca2+ concentration
in exudate from stumps of excised plants within 3 sof application, whereas TRIA required more than 30 s for a
similar response (Fig. 2).