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Allelopathic Influence of Houndstongue (Cynoglossum officinale) and Its Modification By UV-B Radiation

Published online by Cambridge University Press:  20 January 2017

Nancy H. Furness ,
Barbara Adomas ,
Qiujie Dai ,
Shixin Li  and
Mahesh K. Upadhyaya
Nancy H. Furness*
Affiliation:
Faculty of Land and Food Systems, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
Barbara Adomas
Affiliation:
Faculty of Environmental Management and Agriculture, University of Warmia and Mazury, Olsztyn, Poland
Qiujie Dai
Affiliation:
Faculty of Land and Food Systems, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
Shixin Li
Affiliation:
Faculty of Land and Food Systems, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
Mahesh K. Upadhyaya
Affiliation:
Faculty of Land and Food Systems, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
*
Corresponding author's E-mail: [email protected]
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Abstract

Influence of aqueous leaf extracts, leaf residue, and leached-leaf residue of houndstongue, a noxious rangeland weed, on seedling emergence of forage grasses was studied. Ultraviolet-B (UV-B) effects during houndstongue growth on subsequent germination and growth-inhibitory activity of leaf extracts were investigated. Addition of glasshouse-grown houndstongue leaf extract to mineral soil decreased emergence of crested wheatgrass by 13% and prairie junegrass by 20% at 14 d after sowing. Idaho fescue emergence was unaffected. Incorporation of houndstongue leaf- and leached-leaf residue into soil (0.4 g residue : 20 g soil) delayed emergence of forage grasses. At 14 d after sowing, houndstongue leaf residue spread on the soil surface (0.2 g residue : 20 g soil) tended to inhibit seedling emergence more than leaf residues incorporated into soil. In separate experiments, houndstongue plants were grown at 0, 4, 7, and 11 kJ/m2/d biologically effective UV-B radiation for 6 wk, and leaf extracts (0.5, 1, 2, and 4% wt/v) were prepared. Exposure of houndstongue to increasing UV-B dose during plant growth generally increased the inhibitory activity of their leaf extract on prairie junegrass germination. Crested wheatgrass and Idaho fescue seedlings incubated in extracts of houndstongue leaves exposed to UV-B, compared with leaves grown in a UV-B–free environment, had decreased root lengths. Leaf extracts of plants exposed to elevated UV-B levels had higher absorbance at 300 nm, indicating greater concentration of UV-B–absorbing compounds. This study suggests houndstongue leaf extracts and residues inhibit seed germination and seedling emergence and that UV-B may enhance their allelopathic influence on some forage grasses. Field studies are needed to confirm the allelopathic influence of houndstongue under rangeland conditions.

Keywords

Houndstongue, Cynoglossum officinale L. CYWOFcrested wheatgrass, Agropyron cristatum (L.) Gaertn., alternate binomial, Elymus wawawaiensis J. Carlson & Barkworth var. Secar, Idaho fescue, Festuca idahoensis Elmer var. Joseph, prairie junegrass, Koeleria macrantha (Ledeb.) J.A. SchultesAllelopathygerminationleaf extractsleaf residuesrangeland grassesseedling emergence
Type
Research
Information
Weed Technology , Volume 22 , Issue 1 , March 2008 , pp. 101 - 107
Copyright
Copyright © Weed Science Society of America 

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References

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