Systemic transport of tritiated phosphonate in tomato plantlets (lycopersicon esculentum mill)

Phosphonate uptake and distribution were evaluated in tomato plantlets by direct determination and by autoradiography. The rate of root uptake was linear during the 2 h of assay, suggesting active transport of the molecule. Phosphonate was readily taken up through the roots and translocated to the leaves, which contained the molecule within 2 min of root application. Autoradiography showed that phosphonate was transferred apoplastically by veins and progressively entered the lamina by symplastic transport. After a root loading of 2 h, plants were transferred to water and phosphonate levels were evaluated over the following 3 days: the concentrations in roots increased with a corresponding decrease in phosphonate levels in the leaves. These experiments demonstrated the ambimobility of phosphonate.

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