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Annals of Botany 86: 547-550, 2000
© 2000 Annals of Botany Company

Boron Mobility in Two Coniferous Species

T. Lehto+, E. Kallio and P. J. Aphalo

Faculty of Forestry, University of Joensuu, P.O. Box 111, FIN-80101, Joensuu, Finland Geological Survey of Finland, FIN-02151, Espoo, Finland

Received: 21 February 2000 ; Returned for revision: 7 April 2000 . Accepted: 19 May 2000

In contrast to earlier beliefs, it is now known that boron (B) can be retranslocated complexed with sugar alcohols in some plant species. Conifers had been thought not to translocate sugar alcohols in the phloem. However, 1 d after applying10B enriched boric acid to shoots of Scots pine and Norway spruce seedlings, we found increases in both the amount and proportion of10B in the root systems in both species. We conclude that B is translocated in the phloem from shoots to roots in spruce and pine, and therefore it is possible that these species retranslocate B. Copyright 2000 Annals of Botany Company

Scots pine, Pinus sylvestris, Norway spruce, Picea abies, conifers, boron retranslocation, roots, stable isotopes, sugar alcohols, boron complexes, mineral nutrition, forest trees


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