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We examined the effect of salt stress on sugar transport across the plasma membrane of source leaf tissue. We initiated the present study by investigating the effect of salt stress on the sugar transport into mature leaf tissue by measuring sucrose influx into leaf discs. In order to determine if there is a common response to salt stress, we selected two species which have been described as moderately salt-sensitive, faba bean and tomato. We found these two plants exhibit different responses to salinity with regard to sugar transport across the plasmalemma. Whereas salinity decreased sucrose uptake into leaf discs of tomato, it had little effect on faba bean. Also, the inhibitory effect of salinity in tomato was not just limited to freshly cut discs but was observed in aged discs as well. We isolated the plasma membrane from tomato and faba bean using the aqueous two-phase technique and found that although plasma-membrane vesicles obtained from faba bean were able to maintain an acetate gradient, vesicles from tomato were not, thereby eliminating any comparative study on pH-dependent sugar uptake. Studies on passive uptake into these vesicles indicate that the passive uptake in tomato may be different than faba bean.

EFFECT OF SALT STRESS ON SUGAR TRANSPORT IN TOMATO