INTERACTIVE DYNAMICS OF FRUIT AND STEM GROWTH IN TOMATO PLANTS AS AFFECTED BY ROOT WATER CONDITION II. RELATION WITH SUCROSE TRANSLOCATION

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Dynamics of sucrose translocation in hydroponic tomato plants (Lycopersion esculentum Mill.) were analyzed with reference to fruit and stem growth as affected by water relations. Sucrose flux through a pedicel was evaluated by bathing the cut end of the pedicel into a chelating agent of ethylenediaminetetraacetic acid (EDTA) solution under on-line measurement of fruit and stem growth. Sucrose flux and fruit and stem growth were affected by change in root water conditions and appeared in different patterns dependent on change in xylem water potential during dewatering. In the case of larger decrease in xylem water potential and significant stem shrinkage during dewatering, fruit growth was kept higher with decrease in sucrose flux, but rewatering induced immediate swelling of stem and sap back flow from the fruit. On the other hand, the smaller decrease in xylem water potential during dewatering resulted in highly enhanced sucrose flux and fruit growth after rewatering. These results suggest that fruit growth and sucrose translocation can be controlled by the root water condition through interactive dynamics with water relations of translocation path responding to change in xylem water potential.
九州大学の論文