Abstract
Mechanisms of foliar absorption of phosphate and rubidium in primary leaves of bean seedlings were resolved by a newly developed leaf-immersion and leaf-washing technique. Uptake was expressed as “specific absorption,” defined as mμmoles/cm2 leaf X 24 hr from a known concentration of substance in an external solution maintained in a known environment. Criteria for active uptake included time-course analysis, temperature, oxygen, and energy dependence, sensitivity to metabolic inhibitors, accumulation against a concentration gradient, irreversibility, and pH dependence. The results suggest that the over-all process of foliar absorption of rubidium and phosphate by bean leaves, beginning with zero time and extending over a 24-hr period, is metabolic. It is proposed that carriers play an important role in uptake and that they are proteinaceous.
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