biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 44:619-622, 2001 | DOI: 10.1023/A:1013723627127

Utility of Trigonelline as a Biochemical Market for Interspecific Competition between Soybean and the Weed Common Waterhemp

T.L. Pfeiffer1, Y. Cho1, D.J. Gibson1, B.G. Young2, A.J. Wood1
1 Department of Plant Biology, Center for Excellence in Soybean Research, Teaching and Outreach, Southern Illinois University, Carbondale, USA
2 Department of Plant, Soil and General Agriculture, Center for Excellence in Soybean Research, Teaching and Outreach, Southern Illinois University, Carbondale, USA

Interspecific competition between four soybean cultivars (PI471938, Stressland, Essex and Forrest) and the weed, common waterhemp was investigated under increasing weed densities (i.e. 0, 1, 4 and 16 plants per pot). Soybean height and leaflet number were measured over a 45-d period and used to calculate relative growth rates (RGR). Trigonelline (TRG) concentration was determined within the V1 leaf of 45-d-old soybean plants. Soybean leaflet number (P[lt ]0.05), soybean height (P[lt ]0.05) and soybean RGRh (expressed in terms of height) differed significantly (P[lt ]0.05) according to waterhemp density. At each waterhemp density Stressland matured at a significantly faster rate whereas the maturation rate of Essex decreased in the presence of waterhemp. Final TRG concentrations were affected by the interaction between soybean cultivar and waterhemp density. Under no competition, TRG concentration was significantly lower in Forrest relative to PI471938, Stressland and Essex. TRG concentrations in Essex declined in higher waterhemp densities.

Keywords: Amaranthus rudis; Glycine max; relative growth rate
Subjects: Amaranthus rudis; competition, intraspecific; cultivar differences, soybean/weed competition; Glycine max; soybean; trigonelline, biochemical marker, competition; waterhemp/soybean competition; weed management

Published: December 1, 2001  Show citation

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Pfeiffer, T.L., Cho, Y., Gibson, D.J., Young, B.G., & Wood, A.J. (2001). Utility of Trigonelline as a Biochemical Market for Interspecific Competition between Soybean and the Weed Common Waterhemp. Biologia plantarum, 44(4), 619-622. doi: 10.1023/A:1013723627127
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