Similar Fitness
Between Large Crabgrass (Digitaria sanguinalis)
Accessions Resistant or Susceptible to Acetyl-Coenzyme A
Carboxylase Inhibitors
R. J. Wiederholt and D.
E. Stoltenberg
Experiments were conducted to
determine the productivity and the competitive ability of a
large crabgrass accession (PW2) resistant to acetyl-coenzyme A
carboxylase (ACCase) inhibitors relative to a susceptible
accession (A310). Under noncompetitive conditions in the field,
shoot dry biomass and plant height over time were similar for
the two accessions. Leaf area was slightly greater for A310 than
for PW2. The instantaneous relative growth rate was similar for
the accessions. The instantaneous net assimilation rate was
slightly greater for A310 than for PW2; however, the
instantaneous leaf area ratio was slightly greater for PW2 than
for A310. At maturity, the seed yield was similar for the
accessions. The inter-accession competitive ability of PW2 and
A310 plants in the field was similar, based on shoot dry biomass
or seed yield. In the greenhouse, interspecific competitive
ability of the accessions with corn was similar, based on shoot
dry biomass or seed yield. These results suggest that resistance
to ACCase inhibitors is not associated with reduced fitness of
the PW2 accession.
Weed Technol.10:42-49 (1996) |
