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Variation in the Root Bark Phenolics/Sugar Ratio of Douglas-fir Grown in Two Plantations in Northern Idaho Item Info

Several studies have linked high phenolics/sugar ratios in the inner root bark tissue of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) to decreased susceptibility to Armillaria spp. While these studies have identified environmental factors that influence root chemistry, none have examined whether the phenolics/sugar ratio is genetically controlled. In this study, we investigated the effects of genetics and environment on the root bark chemistry of 20 families of 15-year-old Douglas-fir planted in two sites in northern Idaho. Only sugar concentrations varied significantly among families, but site was a significant source of variation for phenolics and the phenolics/sugar ratio. Family x site interactions were significant for the concentrations of all measured root bark compounds as well as for the phenolics/sugar ratio. Phenotypic correlations between height and the phenolics/sugar ratio and between height and sugar concentrations were not significant. However, families with superior height growth and below-average sugar concentrations could be found at both sites. Should a high phenolics/sugar ratio prove effective in selecting genotypes for resistance to Armillaria infection, these results suggest that gains could be made more efficiently by selecting for low sugar concentrations.

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Title:
Variation in the Root Bark Phenolics/Sugar Ratio of Douglas-fir Grown in Two Plantations in Northern Idaho
Creator:
Myszewski, J.H.; Fins, L.; Moore, J.A.; Rust, M.; Mika, P.G.
Date Created (ISO Standard):
2002-03-14
Description:
Several studies have linked high phenolics/sugar ratios in the inner root bark tissue of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) to decreased susceptibility to Armillaria spp. While these studies have identified environmental factors that influence root chemistry, none have examined whether the phenolics/sugar ratio is genetically controlled. In this study, we investigated the effects of genetics and environment on the root bark chemistry of 20 families of 15-year-old Douglas-fir planted in two sites in northern Idaho. Only sugar concentrations varied significantly among families, but site was a significant source of variation for phenolics and the phenolics/sugar ratio. Family x site interactions were significant for the concentrations of all measured root bark compounds as well as for the phenolics/sugar ratio. Phenotypic correlations between height and the phenolics/sugar ratio and between height and sugar concentrations were not significant. However, families with superior height growth and below-average sugar concentrations could be found at both sites. Should a high phenolics/sugar ratio prove effective in selecting genotypes for resistance to Armillaria infection, these results suggest that gains could be made more efficiently by selecting for low sugar concentrations.
Subjects:
research (document genres) roots (plant components) sugar statistics
Location:
North and Central Idaho; Eastern Washington; Western Montana; Northeastern Oregon
Publisher:
Canadian Journal of Forest Research
Source:
Myszewski, J.H., L. Fins, J.A. Moore, M. Rust, and P.G. Mika. 2002. Variation in the root bark phenolic / sugar ratio of Douglas-fir grown in two plantations in northern Idaho. Can. J. For. Res. 32:556-560.
Source Identifier:
Variation_in_the_Root_Bark_Phenolics-Sugar_Ratio_of_DF_Grown_in_Two_Plantations_in_Northern_Idaho_CJFR_032_2002
Type:
text
Format:
application/pdf

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Preferred Citation:
"Variation in the Root Bark Phenolics/Sugar Ratio of Douglas-fir Grown in Two Plantations in Northern Idaho", Idaho Forestry Research Collection, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/forestryresearch/items/forestryresearch932.html
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