Abstract:
:Boron (B) polyol complexes have been isolated and characterized from the phloem sap of celery (Apium graveolens L.) and the extrafloral 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',4' 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.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Hu H,Penn SG,Lebrilla CB,Brown PHdoi
10.1104/pp.113.2.649subject
Has Abstractpub_date
1997-02-01 00:00:00pages
649-55issue
2eissn
0032-0889issn
1532-2548pii
113/2/649journal_volume
113pub_type
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