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Inhibitory Effect of Tall Hedge Mustard (Sisymbrium loeselii) Allelochemicals on Rangeland Plants and Arbuscular Mycorrhizal Fungi

Published online by Cambridge University Press:  20 January 2017

L. D. Bainard ,
P. D. Brown  and
M. K. Upadhyaya
L. D. Bainard
Affiliation:
Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, Vancouver, BC V6T 1Z4, Canada
P. D. Brown
Affiliation:
Chemistry Department, Trinity Western University, 7600 Glover Road, Langley, BC V2Y 1Y1, Canada
M. K. Upadhyaya*
Affiliation:
Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, Vancouver, BC V6T 1Z4, Canada
*
Corresponding author's E-mail: upadh@interchange.ubc.ca
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Abstract

Exotic weeds can interfere with neighboring species by releasing allelochemicals that either directly inhibit growth and distribution of associated species or affect them indirectly by disrupting their interaction with soil organisms, such as arbuscular mycorrhizal fungi (AMF). The allelopathic potential of tall hedge mustard was assessed using aqueous root and shoot extracts in seed germination and radicle growth bioassays. Aqueous tall hedge mustard root and shoot extracts strongly inhibited seed germination and growth of bluebunch wheatgrass, Idaho fescue, and spotted knapweed, but had minimal autotoxicity. Chemical analysis of tall hedge mustard tissues revealed the presence of two major glucosinolates—isopropyl and sec-butyl glucosinolate. The degradation products of these glucosinolates (isopropyl isothiocyanate and sec-butyl isothiocyanate) were identified in dichloromethane extracts of tall hedge mustard aqueous root and shoot extracts. Commercially available isopropyl isothiocyanate and sec-butyl isothiocyanate inhibited seed germination and radicle growth, suggesting their role in the allelopathic potential of tall hedge mustard. Tall hedge mustard aqueous extracts and isothiocyanates incorporated into an agar medium inhibited the spore germination of the AMF, Glomus intraradices. Tall hedge mustard infestations were also found to reduce the AMF inoculum potential of soil under field conditions. The results from this study show that tall hedge mustard produces chemicals that can inhibit the growth of neighboring plant species and their AMF associates.

Keywords

Spotted knapweed, Centaurea maculosa Lam. CENMAtall hedge mustard, Sisymbrium loeselii L. SSYLObluebunch wheatgrass, Pseudoroegneria spicata (Pursh.) LoveIdaho fescue, Festuca idahoensis Elmer., arbuscular mycorrhizal fungus, Glomus intraradices Schenck & Smith.Allelopathyglucosinolatesisopropyl isothiocyanatesec-butyl isothiocyanate
Type
Weed Biology and Ecology
Information
Weed Science , Volume 57 , Issue 4 , August 2009 , pp. 386 - 393
Copyright
Copyright © Weed Science Society of America 

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