Various plant
compartments of a single bell pepper plant were studied to verify
the variability of boron isotope composition in plants and to identify
possible intra-plant isotope fractionation.
Boron mass
fractions varied from 9.8 mg/kg in the fruits to 70.0 mg/kg in the leaves.
Boron (B) isotope ratios reported as δ11B ranged from -11.0‰ to +16.0‰ (U ≤
1.9‰, k=2) and showed a distinct trend to heavier δ11B values the higher the
plant compartments were located in the plant.
A fractionation
of Δ11Bleaf-roots = 27‰ existed in the studied bell pepper plant, which
represents about about 1/3 of the overall natural boron isotope variation (ca.
80‰).
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