Full TGIF Record # 3600
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Web URL(s):http://www.tandfonline.com/doi/abs/10.1080/01904168409363270#.Uf_y7m1nBYU
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Author(s):Hannaway, David B.; Leggett, J. Everett; Bush, Lowell P.; Shuler, Philip E.
Author Affiliation:Department of Agronomy, University of Kentucky, Lexington, Kentucky
Title:Magnesium (Mg) and Rubidium (Rb) absorption by tall fescue
Source:Journal of Plant Nutrition. Vol. 7, No. 7, July 1984, p. 1127-1147.
# of Pages:21
Publishing Information:New York, New York: Marcel Dekker, Inc.
Related Web URL:http://www.tandfonline.com/doi/abs/10.1080/01904168409363270#.Uf_y7m1nBYU
    Last checked: 08/05/2013
    Notes: Abstract only
Keywords:TIC Keywords: Festuca arundinacea; Magnesium; Potassium
Abstract/Contents:"Kinetic experiments were conducted to examine Mg+2 [28Mg] and K+ [86Rb] absorption by 2-week-old tall fescue (Lolium multiflorum Lam. X Festuca arundinacea Schreb.) seedlings. Magnesium absorption was linear for 180 min and was approximately 3.5 ueq Mg+2 g dry weight-1.h-1 from a 0.0625 mM Mg+2 solution. Shoot accumulation of Mg was reduced by increased solution K+. A curvilinear concentration absorption isotherm for roots was obtained for Mg+2. The resultant hyperbolic Hofstee plot could be separated into two linear components with Km values of 0.833 and 0.0117 mM, suggesting that two systems are operable in Mg+2 absorption. Increased solution pH increased Mg+2 absorption both in the presence and absence of NH+ 4. At pH 6.5 NH+ 4 increased Mg+2 absorption 75%; at pH 3.5 the increase was more than 6-fold. Potassium absorption was linear through 60 min and was decreased by increased Mg2+ levels. Shoot accumulation of [86Rb] was decreased by the first increment of Mg+2, whereas further increases in Mg+2 did not result in significant decreases. In the presence of NH+ 4, K absorption was significantly decreased in the alkaline range. In the absence of NH+ 4, much higher rates of Absorption were observed and less of a reduction was noted at the higher pH values. An important factor limiting the genetic capability of Mg accumulation in tall fescue is solution K concentration. These experiments suggest that future selection of improved tall fescue cultivars should be conducted in the presence of high solution K and with the selection criteria of >= 0.2 % tissue Mg."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hannaway, D. B., J. E. Leggett, L. P. Bush, and P. E. Shuler. 1984. Magnesium (Mg) and Rubidium (Rb) absorption by tall fescue. J. Plant Nutr. 7(7):p. 1127-1147.
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DOI: 10.1080/01904168409363270
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