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Root Chemistry of Douglas-fir Seedlings Grown Under Different Nitrogen and Potassium Treatments Item Info

Chemical changes in roots of Douglas-fir (Pseudotsuga menziesii var. g/auca (Bessn.) Franco) seedlings were induced under optimal and deficient levels of nitrogen (N) and potassium (K). Concentrations of sugar, starch, phenolics and proteinprecipitable tannins were significantly different by treatment in the roots of four-year-old Douglas-fir seedlings under varied Nand K regimes. Root tip starch concentrations were significantly higher and sugar concentrations were lower in plants receiving the low-N treatments. Seedlings receiving the high N-low K treatment had significantly lower concentrations of phenolics and tannins and lower ratios of defensive compounds to carbohydrates than seedlings receiving the high potassium treatments. Samples taken from two locations on the root system show that concentrations of all storage and defensive compounds were substantially higher in the root collar than in the root tips. Due to lower within tissue variation, we recommend sampling at root tips to better detect treatment differences. This study shows that N levels affect starch concentrations in the roots, while K levels affect root phenolic and tannin concentrations.

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Title:
Root Chemistry of Douglas-fir Seedlings Grown Under Different Nitrogen and Potassium Treatments
Creator:
Shaw, T.M.; Moore, J.A.; Marshall, J.D.
Date Created (ISO Standard):
1998-04-01
Description:
Chemical changes in roots of Douglas-fir (Pseudotsuga menziesii var. g/auca (Bessn.) Franco) seedlings were induced under optimal and deficient levels of nitrogen (N) and potassium (K). Concentrations of sugar, starch, phenolics and proteinprecipitable tannins were significantly different by treatment in the roots of four-year-old Douglas-fir seedlings under varied Nand K regimes. Root tip starch concentrations were significantly higher and sugar concentrations were lower in plants receiving the low-N treatments. Seedlings receiving the high N-low K treatment had significantly lower concentrations of phenolics and tannins and lower ratios of defensive compounds to carbohydrates than seedlings receiving the high potassium treatments. Samples taken from two locations on the root system show that concentrations of all storage and defensive compounds were substantially higher in the root collar than in the root tips. Due to lower within tissue variation, we recommend sampling at root tips to better detect treatment differences. This study shows that N levels affect starch concentrations in the roots, while K levels affect root phenolic and tannin concentrations.
Subjects:
research roots (plant components) fertilizer statistics
Source:
Shaw, T.M., J.A. Moore, J.D. Marshall, 1998. IFTNC Supplemental Report No. 3, Root Chemistry of Douglas-fir Seedlings Grown Under Different Nitrogen and Potassium Treatments. IFTNC, FWR, Univ. of Idaho, Moscow.
Source Identifier:
Root_Chemistry_of_DF_Seedlings_Grown_Under_Different_Nitrogen_and_Potassium_Treatments_IFTNC_1998
Type:
Text
Format:
application/pdf

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Preferred Citation:
"Root Chemistry of Douglas-fir Seedlings Grown Under Different Nitrogen and Potassium Treatments", Intermountain Forestry Cooperative, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iftnc/items/iftnc4807.html
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This document is provided by the University of Idaho Library for use by University of Idaho students, staff, and faculty. All rights to the document linked from this metadata belong to the author, rights holder, and/or provider. For more information contact The Intermountain Forestry Cooperative, https://www.uidaho.edu/cnr/ifc
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