STOMATAL RESPONSES TO JASMONIC ACID, LINOLENIC ACID AND ABSCISIC-ACIDIN WILD-TYPE AND ABA-DEFICIENT TOMATO PLANTS

Wild-type and abscisic acid (ABA) -deficient (sitiens) tomato plants w ere used to analyse the effects of abscisic acid (ABA), butyric acid ( BA), jasmonic acid (JA) and linolenic acid (LA) on assimilation and tr anspiration rates in detached leaves taking up those substances into t he transpiration stream. BA did not affect assimilation and transpirat ion rates. ABA decreased assimilation and transpiration in both wild-t ype and ABA-deficient mutants, JA reduced the assimilation rate in bot h lines but induced a significant reduction of transpiration in the wi ld type only. The response to LA in both lines was slower than that to JA.