Abstract
The concentrations of α-tocopherol in foliage samples of soybeans ( Glycine max) and pinto beans ( Phaseolus vulgaris) were investigated. In both species, the α-tocopherol concentrations increased with age. Four-week-old soybeans had α-tocopherol concentrations of 135.1, 64.2 and 48.9 μg g −1 dry wt in unifoliates, first trifoliates and second trifoliates, respectively, while four-week-old pinto beans had α-tocopherol concentrations of 288.7, 123.3 and 40.6 μg g −1 dry wt in unifoliates, first trifoliates and second trifoliates. These results strengthen the hypothesis that increasing levels of α-tocopherol may act as an indicator of biological age in various plant species.
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