DOI: 10.1080/01904168409363270 Web URL(s): http://www.tandfonline.com/doi/abs/10.1080/01904168409363270#.Uf_y7m1nBYU Publication Type:
i
Report 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 Keywords: TIC Keywords: Festuca arundinacea ; Magnesium ; Potassium Abstract/Contents: "Kinetic experiments were conducted to examine Mg+2 [28 Mg] and K+ [86 Rb] 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 [86 Rb] 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." Language: English References: 16 Note: Graphs ASA/CSSA/SSSA Citation (Crop Science -Like - may be incomplete ): J. Plant Nutr. 7(7):p. 1127-1147.Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=3600 If there are problems with this record, send us feedback about record 3600 . Choices for finding the above item : DOI: 10.1080/01904168409363270 Web URL(s): http://www.tandfonline.com/doi/abs/10.1080/01904168409363270#.Uf_y7m1nBYU b2516613a Find from within TIC: Request through your local library's inter-library loan service (bring or send a copy of this TGIF record)
