Boron Uptake by Excised Barley Roots: I. Uptake into the Free Space 12
AUTOR(ES)
Bowen, John E.
RESUMO
At 2 C, all boron accumulated by excised barley roots (Hordeum vulgare L. cv. Herta) remains in the free space; i.e. active uptake is nil at this temperature. Three component fractions of free space B were apparent: (a) a surface contaminant film of B on blotted roots, (b) water free space B, and (c) B reversibly bound in the cell walls. A stoichiometric release of H+ from the roots in the presence of B indicated that B was bound by borate complexes with polysaccharides in the cell walls. Polysaccharide-borate complexes are much less stable than those of monosaccharides, and the bound B fraction could be readily removed by rinsing the roots in the presence of a monomeric polyol possessing the necessary cis-diol configuration. Cell wall material separated from excised barley roots had a B binding capacity 66% greater than that of intact roots.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=542025Documentos Relacionados
- Uptake of calcium by excised barley roots 12
- Absorption of Chloride by Barley Roots: Kinetics and Selectivity 12
- Kinetics of Rb Absorption by Excised Barley Roots under Changing Rb Concentrations. I. Effects of Other Cations on Rb Uptake 1
- Respiration and Salt Absorption by Excised Barley Roots. 12
- Uptake of magnesium & its interaction with calcium in excised barley roots 12