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Smoke-Isolated Trimethylbutenolide Inhibits Seed Germination of Different Weed Species by Reducing Amylase Activity

Published online by Cambridge University Press:  20 January 2017

Heino B. Papenfus ,
Manoj G. Kulkarni ,
Martin Pošta ,
Jeffrey F. Finnie  and
Johannes Van Staden
Heino B. Papenfus
Affiliation:
Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South Africa
Manoj G. Kulkarni
Affiliation:
Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South Africa
Martin Pošta
Affiliation:
Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2., 166 10, Prague 6, Czech Republic
Jeffrey F. Finnie
Affiliation:
Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South Africa
Johannes Van Staden*
Affiliation:
Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South Africa
*
Corresponding author's E-mail: rcpgd@ukzn.ac.za
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Abstract

Weeds pose a great problem to farmers worldwide, and controlling weeds demands a high input cost for herbicides and labor. Because of current environmental regulations, a limited number of herbicides are commercially available (with limited modes of action) to control weeds. Smoke water and the biologically active compounds isolated from smoke affect seed germination in a significant way. Smoke water (SW) and karrikinolide (KAR1, the germination stimulant isolated from smoke) have been tested extensively for their ability to promote seed germination in a vast array of plant species. In addition to KAR1, a germination inhibitor, trimethylbutenolide (TMB), was also isolated from plant-derived smoke. The effects of SW, KAR1, and TMB were tested on five major weed species of South Africa: fleabane, hairy wild lettuce, bugweed, spilanthes, and fameflower. Seeds of these weed species were subjected to 16/8 h light/dark conditions or to constant dark conditions at constant temperatures of 20, 25, 30 C and alternating 30/20 C. SW and KAR1 significantly increased germination, whereas TMB significantly inhibited germination of these weed species. Furthermore, TMB treatment reduced the amylase activity of the tested weed seeds compared with the water control. These results indicate the possibility of manipulating germination of certain weed seeds by SW, KAR1, and TMB. Thus, smoke and smoke-isolated compounds could potentially be used in new weed management strategies.

Keywords

Karrikinolide, KAR1, 3-methyl-2H-furo[2,3c]pyran-2-onetrimethylbutenolide, TMB, 3,4,5-trimethylfuran-2(5H)-onebugweed, Solanum mauritianum Scop.fameflower, Talinum paniculatum (Jacq.) Gaertn.fleabane, Conyza albida Willd. ex Sprengelhairy cat's ear, Hypochaeris radicata L.spilanthes, Spilanthes decumbens (Sm.) A.H. Moore.Germination inhibitionjewels of Oparsmoke waterweed-free periods
Type
Weed Management
Information
Weed Science , Volume 63 , Issue 1 , March 2015 , pp. 312 - 320
Copyright
Copyright © Weed Science Society of America 

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