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Phosphate and calcium uptake in beech (Fagus sylvatica) in the presence of aluminium and natural fulvic acids
Author(s) -
Asp Håkan,
Berggren Dan
Publication year - 1990
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1990.tb04412.x
Subject(s) - fagus sylvatica , chemistry , beech , shoot , calcium , phosphate , nuclear chemistry , nutrient , magnesium , aluminium , botany , biochemistry , organic chemistry , biology
In the present study we examine the effects of Al on the uptake of Ca 2+ and H 2 PO ‐ 4 in beech (Fagus sylvatica L.) grown in inorganic nutrient solutions and nutrient solutions supplied with natural fulvic acids (FA). All the solutions used were chemically well characterized. The uptake of Al by roots of intact plants exposed to solutions containing 0, 0.15 or 0.3 m M AlCl 3 for 24 h, was significantly less if FA (300 mg l −1 ) were also present in the solutions. The Ca 2+ ( 45 Ca 2+ ) uptake was less affected by Al in solutions supplied with FA than in solutions without FA. There was a strong negative correlation between the Al and Ca 2+ uptake (r 2 =0.98). When the Al and Ca 2+ ( 45 Ca 2+ ) uptake were plotted as a function of the Al 3+ activity (or concentration of inorganic mononuclear Al), almost the same response curves were obtained for the ‐FA and +FA treatments. We conclude that FA‐complexed Al was not available for root uptake and therefore could not affect the Ca 2+ uptake. The competitive effect of Al on the Ca 2+ uptake was also shown in a 5‐week cultivation experiment, where the Ca concentration in shoots decreased at an AlCl 3 concentration of 0.3 m M . The effect of Al on H 2 PO − 4 uptake was more complex. The P content in roots and shoots was not significantly affected, compared with the control, by cultivation for 5 weeks in a solution supplied with 0.3 m M AlCl 3 , despite a reduction of the H 2 PO − 4 concentration in the nutrient solution to about one‐tenth. At this concentration Al obviously had a positive effect on H 2 PO − 4 uptake. The presence of FA decreased 32 P‐phosphate uptake by more than 60% during 24 h, and the addition of 0.15 or 0.3 m M AlCl 3 to these solutions did not alter the uptake of 32 P‐phosphate.