Abstract
The evolution of herbicide resistance can increase, decrease, or have no effect on the growth rate, competitive ability, and fitness of field-selected populations. The growth response of an ACCase-resistant (R) johnsongrass [Sorghum halepense (L.) Pers.] population harboring an Ile1781Leu mutation, and a susceptible (S) population was studied in pot experiments under intraspecific and interspecific competition with corn or sunflower, using a target-neighborhood design. The R population in the intraspecific competition indicated greater fitness-related traits such as height (H), tiller number (TN), aboveground fresh weight (AFW), and rhizome fresh weight (RFW) than the S population. Aggressiveness, competitive ratio, competition intensity index, and relative competition intensity indices confirmed also the superiority of the R population. Similarly, the R population grown in interspecific competition with corn or sunflower produced greater H, TN, and AFW than the S population. In addition, both R and S populations growing in competition with corn produced more H, TN, and AFW than those growing in competition with sunflower. Furthermore, the R population in competition with corn hybrids resulted in a greater reduction in H and AFW in corn plants. These findings strongly support the evidence of fitness advantage in the R population harboring the 1781Leu mutant allele as compared to the S counterpart.
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Claims 5
Claim · model-written summary
Resistant johnsongrass exceeded susceptible plants in height, tillers and fresh weights under intraspecific competition.
- Taxon
- johnsongrass
.jpg?width=60)
Sorghum halepenset0 - Material
- R populatione0
- Outcome
- height (H), tiller number (TN), aboveground fresh weight (AFW)e0
- Direction
- greatere0
- Comparator
- S populatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The R population in the intraspecific competition indicated greater fitness-related traits such as height (H), tiller number (TN), aboveground fresh weight (AFW), and rhizome fresh weight (RFW) than the S population.”
t0“Intra- and Interspecific Competition Between Ile1781Leu ACCase-Resistant and Susceptible Johnsongrass (Sorghum halepense) Populations and Corn or Sunflower”
Claim · model-written summary
Competition indices also indicated superiority of resistant johnsongrass.
- Taxon
- johnsongrassSorghum halepenset0
- Material
- R populatione0
- Outcome
- Aggressiveness, competitive ratio, competition intensity indexe0
- Direction
- superioritye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aggressiveness, competitive ratio, competition intensity index, and relative competition intensity indices confirmed also the superiority of the R population.”
t0“Intra- and Interspecific Competition Between Ile1781Leu ACCase-Resistant and Susceptible Johnsongrass (Sorghum halepense) Populations and Corn or Sunflower”
Claim · model-written summary
Resistant johnsongrass had greater height, tiller number and aboveground fresh weight than susceptible plants when competing with corn or sunflower.
- Taxon
- johnsongrassSorghum halepenset0
- Material
- R populatione0
- Interactor
- corn or sunflower
Helianthus annuus
Zea mays subsp. mayse0other - Outcome
- H, TN, and AFWe0
- Direction
- greatere0
- Comparator
- S populatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the R population grown in interspecific competition with corn or sunflower produced greater H, TN, and AFW than the S population.”
t0“Intra- and Interspecific Competition Between Ile1781Leu ACCase-Resistant and Susceptible Johnsongrass (Sorghum halepense) Populations and Corn or Sunflower”
Claim · model-written summary
Both johnsongrass populations grew more with corn than sunflower competition.
- Taxon
- johnsongrassSorghum halepenset0
- Material
- R and S populationse0
- Interactor
- cornZea mays subsp. mayse0other
- Outcome
- H, TN, and AFWe0
- Direction
- moree0
- Comparator
- sunflowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both R and S populations growing in competition with corn produced more H, TN, and AFW than those growing in competition with sunflower.”
t0“Intra- and Interspecific Competition Between Ile1781Leu ACCase-Resistant and Susceptible Johnsongrass (Sorghum halepense) Populations and Corn or Sunflower”
Claim · model-written summary
Resistant johnsongrass caused greater reductions in corn height and aboveground fresh weight.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- R populatione0
- Interactor
- R populatione0weed
- Outcome
- H and AFW in corn plantse0
- Direction
- greater reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the R population in competition with corn hybrids resulted in a greater reduction in H and AFW in corn plants.”