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Rapid Germination of Sulfonylurea-Resistant Kochia scoparia L. Accessions is Associated with Elevated Seed Levels of Branched Chain Amino Acids

Published online by Cambridge University Press:  12 June 2017

William E. Dyer ,
Peng W. Chee  and
Peter K. Fay
William E. Dyer
Affiliation:
Plant and Soil Sci. Dep., Montana State Univ., Bozeman, MT 59717
Peng W. Chee
Affiliation:
Plant and Soil Sci. Dep., Montana State Univ., Bozeman, MT 59717
Peter K. Fay
Affiliation:
Plant and Soil Sci. Dep., Montana State Univ., Bozeman, MT 59717
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Abstract

Field observations indicate that sulfonylurea-resistant kochia may germinate at lower soil temperatures and/or germinate more rapidly than susceptible kochia in the absence of herbicide. To investigate this possibility, seeds from three resistant and two susceptible kochia accessions were germinated at temperatures ranging from 4.6 to 13.2 C on thermal gradient plates. At 4.6 and 13.2 C, germination rates of all resistant accessions were higher than susceptible accessions, while germination rates of one resistant accession were higher than susceptible accessions at 7.2 and 10.5 C. Percent germination of all resistant accessions was significantly higher than susceptible accessions after 48 h at 4.6 C. At higher temperatures, percent germination of some resistant accessions was higher after 12 or 24 h, but germination of all accessions was similar at later times. HPLC analysis revealed that seeds from resistant accessions contained about 2-fold higher free levels of branched chain amino acids than seeds from susceptible accessions. The results indicate that mutations conferring resistance to sulfonylurea herbicides in these kochia accessions may concomitantly reduce or abolish acetolactate synthase sensitivity to normal feedback inhibition patterns, resulting in elevated levels of branched chain amino acids available for cell division and growth during early germination.

Keywords

Kochia, Kochia scoparia L. Schrad #3 KCHSCchlorsulfuron, 2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamideGermination rateherbicide-resistant weedsisoleucinevalineleucineacetolactate synthaseKCHSC
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 41 , Issue 1 , March 1993 , pp. 18 - 22
Copyright
Copyright © 1993 by the Weed Science Society of America 

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References

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