Summary
A greenhouse experiment was conducted with tall fescue (Festuca arundinacea Schreb.) lines to determine the influence of root diameter and Mg concentration in nutrient solution on Mg uptake into shoots and roots. Propagules of 4 clonal tall fescue lines differing in root morphology, and a selection of ‘Kentucky 31’ (Ky 31), were grown for 39 or 70 days in 12-liter tanks containing a complete nutrient solution and Mg concentrations of 3, 21, 42, 125, 250, and 500 µM as MgSO4. Root diameters averaged 0.98mm for line AU-7; 0.83mm for line AU-264; O.72mm for line AU-718; 0.72mm for line AU-5; and 0.69mm for Ky 31. At 39 days. leaf Mg concentration increased from about 1200µg/g at the 3µM concentration to about 2200 to 2400µg/g at the 125µM Mg concentration. Consistently, the large diameter root (LDR) lines AU-7 and AU-264 contained less Mg than the small diameter root (SDR) lines AU-5 and AU-718 and the selection of Ky 31 at both 39 and 70 days. Root Mg concentration was 50% of leaf Mg concentration. An Eadie-Hofstee plot indicated that influx of Mg proceeds via dual uptake mechanisms. The influx mechanism of the tall fescue line AU-7 appears to be saturated at a lower Mg concentration than the other fescue lines. SDR lines AU-5 and AU-718 have a larger capacity to accumulate Mg from solution.
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© 1987 Martinus Nijhoff Publishers, Dordrecht/Boston/Lancaster
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Pedersen, J.F., Edwards, J.H., Torbert, H.A. (1987). Root morphological effects on Mg uptake in five tall fescue lines. In: Gabelman, W.H., Loughman, B.C. (eds) Genetic Aspects of Plant Mineral Nutrition. Developments in Plant and Soil Sciences, vol 27. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3581-5_31
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DOI: https://doi.org/10.1007/978-94-009-3581-5_31
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