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EFFECT OF ABSCISIC ACID ON EXUDATE OSMOLARITY AND PROTON FLUX IN EXCISED MAIZE ROOTS
Abstract
The effect of abscisic acid (ABA) on the xylem exudate osmolarity and proton flux in in excised roots of maize (Zea mays L.) cv Anjou 210 was determined It was observed that ABA does not alter the exudate osmolarity until 24 h from excision, but beyond this, there was a little drop in the exudate osmolarity. ABA increased potassium flux (Qoix) leaving the proton flux (Qion) little or unaffected. The noticeable point, however , was the increased chloride flux(Qoia) by ABA , and differential response of root segments to create a proton gradient. These data suggests that ABA has an additive effect on the proton pump in excised maize root cells. This happened to maintain primary energy requiring process ‘’Qion’’ for increased K transport into the symplasm.
