Figure 1.

δ ¹⁵N (¹⁵N/¹⁴N ratio) (a) and δ ¹³C (¹³C/¹²C ratio) (b) natural abundance values as changed by water stress and boron treatments (foliar boron was applied at 0.45 kg·ha⁻¹ at flowering and seed-fill stages) in Williams 82 cultivar (maturity group III). Treatments were as follows: well-watered plants with no foliar B (W − B), well-watered plants with foliar B (W + B), water-stressed plants with no foliar B (WS − B), and water-stressed plants with foliar B (WS + B).