Abstract
The influence of the pH in the nutrient solution (pH 3 to 10) on uptake and translocation of boron (B) in the xylem of young sunflower plants was investigated over a three hour treatment. Two B concentrations were supplied during the whole growth period of seven days: a marginal (1 μM) and a sufficient supply (100 μM). Boron concentrations in the xylem exudate responded both to B and pH treatments. When B supply was sufficient, B concentration in the xylem exudate was the same or lower than that in the nutrient solution and inversely related to the exudation rate. In contrast at marginal supply, B concentration in the xylem exudate was up to 25-fold higher than in the nutrient solution and decreased in direct proportion to the pH dependent concentration of undissociated boric acid. In conclusion, the results indicate that there might be two different mechanisms for uptake and translocation of B in sunflower. At sufficient supply, it seems that a passive diffusion process of boric acid, partly restricted by permeability of membranes, is responsible for uptake. At marginal supply, a concentration mechanism for boric acid builds up a gradient against the nutrient solution, obviously to satisfy the B demand of the plant.
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References
Bingham F T, Elseewi A and Oertli J J 1970 Characteristics of boron absorption by excised barley roots. Soil Sci. Soc. Amer. Proc. 34, 613-617.
Brown P H and Hu H 1994 Boron uptake by sunflower, squash and cultured tobacco cells. Physiol. Plant. 91.435-441.
Garnett T P, Tester M A and Nable R 0 1994 The control of boron accumulation by two genotypes of wheat. Plant and Soil 155/156, 305-308.
Kochian L V 1991 Mechanisms of micronutrient uptake and translocation in plants. In Micronutrients in Agriculture, 2nd ed. Ed J J Mortvedt, F R Cox. L M Shuman and R M Welch, pp 229-296. Soil Science Society America Book Series No.4.
Lohse G 1982 Microanalytical azomethine-H method for boron determination in plant tissue. Commun. Soil Sci. Plant Anal. 13,127-134.
Marschner H 1995 Mineral Nutrition of Higher Plants, 2nd ed. Academic Press, London. 889 p.
Nable R O 1988 Resistance to boron toxicity amongst several barley and wheat cultivars: A preliminary examination of the resistance mechanism. Plant and Soil 112, 45-52.
Nissen P 1974 Uptake mechanisms: Inorganic and organic. Ann. Rev. Plant Physiol. 25, 53-79.
Oertli J J and Grgurevic E 1975 Effect of pH on the absorption of boron by excised barley roots. Agron. J. 67, 278-280.
Pfeffer H, Dannel F and Römheld V 1997 Compartmentation of boron in roots and its translocation to the shoot of sunflower as affected by short term changes in boron supply. In Boron in Soils and Plants. Proceedings Eds R W Bell and B Rerkasem. pp 203-207. Kluwer Academic Publishers, the Netherlands.
Raven J A 1980 Short-and long-distance transport of boric acid in plants. New Phytol. 84, 231-249.
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© 1997 Springer Science+Business Media Dordrecht
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Dannel, F., Pfeffer, H., Römheld, V. (1997). Effect of pH and boron concentration in the nutrient solution on translocation of boron in the xylem of sunflower. In: Bell, R.W., Rerkasem, B. (eds) Boron in Soils and Plants. Developments in Plant and Soil Sciences, vol 76. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5564-9_36
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DOI: https://doi.org/10.1007/978-94-011-5564-9_36
Publisher Name: Springer, Dordrecht
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