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PLANT PHYSIOLOGY , Vol 113, Issue 2 649-655, Copyright © 1997 by American Society of Plant Biologists
Isolation and Characterization of Soluble Boron Complexes in Higher Plants (The Mechanism of Phloem Mobility of Boron)
H. Hu, S. G. Penn, C. B. Lebrilla and P. H. Brown
Department of Pomology (H.H., P.H.B.), Department of Chemistry (S.G.P., C.B.L.), University of California, Davis, California 95616
Boron (B) polyol complexes have been isolated and characterized from the
phloem sap of celery (Apium graveolens L.) and the extra-floral nectar of
peach (Prunus persica L.). In celery the direct analysis of untreated
phloem sap by matrix-assisted laser desorption-Fourier transform mass
spectrometry, with verification by high-performance liquid chromagraphy and
gas chromatography-mass spectrometry, revealed that B is present in the
phloem as the mannitol-B-mannitol complex. Molecular modeling further
predicted that this complex is present in the 3,4 3[prime],4[prime]
bis-mannitol configuration. In the extrafloral nectar of peach, B was
present as a mixture of sorbitol-B-sorbitol, fructose-B-fructose, or
sorbitol-B-fructose. To our knowledge, these findings represent the first
successful isolation and characterization of soluble B complexes from
higher plants and provide a mechanistic explanation for the observed phloem
B mobility in these species.
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