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Web URL(s): | https://dl.sciencesocieties.org/publications/aj/pdfs/86/6/AJ0860061079 Last checked: 12/14/2016 Requires: PDF Reader Access conditions: Item is within a limited-access website |
Publication Type:
| Refereed |
Author(s): | Carroll, Mark J.;
Slaughter, Leon H.;
Krouse, John M. |
Author Affiliation: | Agronomy Department, University of Maryland, College Park, MD |
Title: | Turgor potential and osmotic constituents of Kentucky bluegrass leaves supplied with four levels of potassium |
Source: | Agronomy Journal. Vol. 86, No. 6, November/December 1994, p. 1079-1083. |
Publishing Information: | Washington: American Society of Agronomy |
# of Pages: | 5 |
Keywords: | TIC Keywords: Potassium; Turgor; Poa pratensis; Leaves; Osmotic potential
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Abstract/Contents: | "Solute accumulation is one mechanism by which plants are able to sustain positive leaf turgor potentials (Psi t). Potassium, the cation most often found in greatest concentration in Kentucky bluegrass (Poa pratensis L.), can influence accumulation of solutes. A 2-yr glasshouse study was conducted to determine the effect of K availability on accumulation of six osmotically active solutes and Psi t within leaves of Kentucky bluegrass. Four nutrient solutions containing 0, 10, 100, or 124 mg K L -1 were applied three times weekly to plants grown in silica sand. Small increases in K (0 to 10, or 100 to 124 mg L -1) had no effect on Psi t but increasing K from 0 or 10, to 100 or 124 mg L -1 increased leaf Psi t 0.19 to 0.35 MPa. Increasing K from 10 to 100 mg L -1 caused leaf osmotic potential (Psi 3.1416) to decline by 0.17 to 0.23 MPa. Potassium was the only measured osmotically active solute that could account for most of the decline in Psi 3.1416. When the supply of K was increased from 10 to 100 mg L -1, the resulting increase in leaf K concentration caused the calculated contribution of K alone to depress leaf Psi 3.1416 by 0.29 to 0.31 MPa. Conversely, the combined calculated osmotic contribution of Ca, Mg, glucose, fructose, and sucrose increased leaf Psi 3.1416 by 0.12 to 0.13 MPa when K was increased from 10 to 100 mg L -1. The calculated osmotic contribution of all six osmolytes accounted for 46 to 60% of the measured Psi 3.1416. Increasing Kentucky bluegrass K tissue concentration appears to have a small but positive influence in increasing leaf turgor." |
Language: | English |
References: | 23 |
See Also: | Other items relating to: Potassium |
Note: | Tables |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Carroll, M. J., L. H. Slaughter, and J. M. Krouse. 1994. Turgor potential and osmotic constituents of Kentucky bluegrass leaves supplied with four levels of potassium. Agron. J. 86(6):p. 1079-1083. |
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| Web URL(s): https://dl.sciencesocieties.org/publications/aj/pdfs/86/6/AJ0860061079 Last checked: 12/14/2016 Requires: PDF Reader Access conditions: Item is within a limited-access website |
| MSU catalog number: S 22 .A45 |
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