Permeability of peach leaf cuticles to boron
1994
Shu, Z.H. | Wu, W.Y.J. | Oberly, G.H. | Cary, E.E.
Isolated leaf cuticles and intact plants of one-year-old potted 'Red Haven' trees grown in the greenhouse were used to study the permeability of leaf cuticles to boron (B). The isolated leaf cuticles were prepared enzymatically. Flux was determined using a transport cell. Permeability coefficient (P) was calculated and used as the parameter of cuticle permeability to B. For intact plant studies, enriched-10B boric acid solution was evenly spread onto the abaxial or the adaxial side of a leaf. The trees were sacrificed three days after the treatment and selected plant parts were analyzed with ICP-AES and ICP-MS spectrometers. The 10B content was used as the parameter of B permeability in vivo. The permeability coefficient of peach leaf adaxial cuticle was in the order of 10(-7) cm/sec. There were no difference in the permeability coefficients among B concentration and surfactant treatments. The pH had variable effect on B absorption through the cuticle of the adaxial side of the leaf. For the in vivo study of B uptake by peach leaves, the abaxial side was more efficient than the adaxial side, with the total 10B taken up four times greater in the abaxial side than the adaxial side. The absorption percentages of the total 10B applied in the abaxial and adaxial sides were 0.31% and 0.08%, respectively. Scratches on the treated leaves made the total 10B uptake and translocation higher than the control treatment.
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