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FOLIAR ABSORPTION—AN ACTIVE UPTAKE PROCESS
Author(s) -
Jyung W. H.,
Wittwer S. H.
Publication year - 1964
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1964.tb06654.x
Subject(s) - rubidium , phosphate , biology , absorption (acoustics) , botany , horticulture , biochemistry , potassium , chemistry , materials science , organic chemistry , composite material
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/cm 2 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.