Differences in iron nutrition strategies of two calcifuges, Carex pilulifera L. and Veronica officinalis L
1997
Zohlen, A. | Tyler, G.
Veronica officinalis and Carex pilulifera, widespread calcifuge plants in Europe, were cultivated in acid and calcareous soils to study differences in Fe aquisition strategies indicated in previous studies. The experiments were performed in a computer-controlled glasshouse at a soil solution moisture content of 50-60% water holding capacity; additional light was supplied at 70 W m-2 if ambient light was < 100 W m-2 between 0600 and 1800h. Both species developed chlorosis when grown in the calcareous soil. C. pilulifera proved unable to translocate sufficient amounts of Fe to the leaves when cultivated in calcareous soil, but much Fe accumulated in, and especially as a precipitate on the surface of roots. In contrast, V. officinalis tended to increase Fe taken up into the leaves of plants grown on calcareous soil, but a much greater proportion of the leaf tissue Fe was accumulated as less active forms not extracted by Fe complexing agents, e.g. 1,10-phenanthroline, than was the case in acid-soil grown plants. Considerably less Fe was accumulated in the root biomass of V. officinalis compared to C. pilulifera. It is concluded that chlorosis in C. pilulifera is related to insufficient Fe uptake in the leaves, whereas leaf immobilization of Fe in physiologically less active forms is the problem in V. officinalis.
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