Abstract
Background/Objectives: Johnsongrass (Sorghum halepense) is an erect tetraploid, perennial, C4 grass weed species categorized among the world’s most noxious weeds due to its high competitive ability against crops and the increased number of field-evolved herbicide-resistant populations. The aim of the present study was to assess the growth rate and performance of resistant (R) johnsongrass genotypes hosting Trp574Leu target-site cross-resistance at ALS gene, inhibiting various herbicides, compared to susceptible (S) conspecific weeds, in the absence and presence of corn or sunflower antagonism. Methods: The aboveground biomass, tiller, and rhizome production ability of one S and one R johnsongrass population with a Trp574-Leu substitution conferring cross-resistance to ALS-inhibiting herbicides were compared under non-competitive conditions. Furthermore, the competitive ability of these two johnsongrass populations against corn or sunflower was determined in a target-neighborhood design. Results: The S and R johnsongrass populations displayed similar growth rates concerning aboveground biomass and tiller number, whereas the R population displayed a slightly greater growth rate for rhizome production compared to the S population. Both populations grown with corn produced more aboveground biomass than the ones grown with sunflowers. The aboveground biomass of corn was reduced to a greater extent than sunflower by the presence of both johnsongrass populations, while both crops were affected more by the S than by the R population. Conclusions: Although the inheritance and the genetic background of plant materls were not addressed, the findings of this study indicate clearly that the growth rate and competitive ability of the ALS-resistant johnsongrass population are not associated with the resistance mechanism involved.
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Claims 7
Claim · model-written summary
Resistant and susceptible johnsongrass had similar aboveground biomass growth.
- Taxon
- johnsongrass
.jpg?width=60)
Sorghum halepensee0 - Material
- S and R johnsongrass populationse0
- Outcome
- growth rates concerning aboveground biomasse0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The S and R johnsongrass populations displayed similar growth rates concerning aboveground biomass and tiller number”
Claim · model-written summary
Resistant and susceptible johnsongrass had similar tiller number growth.
- Taxon
- johnsongrassSorghum halepensee0
- Material
- S and R johnsongrass populationse0
- Outcome
- tiller numbere0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The S and R johnsongrass populations displayed similar growth rates concerning aboveground biomass and tiller number”
Claim · model-written summary
Resistant johnsongrass had slightly greater rhizome production growth.
- Taxon
- johnsongrassSorghum halepenset0
- Material
- R populatione0
- Outcome
- growth rate for rhizome productione0
- Direction
- slightly greatere0
- Comparator
- S populatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the R population displayed a slightly greater growth rate for rhizome production compared to the S population.”
t0“Johnsongrass”
Claim · model-written summary
Both johnsongrass populations produced more aboveground biomass with corn than sunflower.
- Taxon
- johnsongrassSorghum halepenset0
- Interactor
- corn
Zea mays subsp. mayse0other - Outcome
- aboveground biomasse0
- Direction
- moree0
- Comparator
- sunflowerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both populations grown with corn produced more aboveground biomass than the ones grown with sunflowers.”
t0“Johnsongrass”
Claim · model-written summary
Johnsongrass reduced corn biomass more than sunflower biomass.
- Taxon
- cornZea mays subsp. mayse0
- Interactor
- johnsongrassSorghum halepensee0weed
- Outcome
- aboveground biomass of corne0
- Direction
- reducede0
- Comparator
- sunflowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The aboveground biomass of corn was reduced to a greater extent than sunflower by the presence of both johnsongrass populations”
Claim · model-written summary
Susceptible johnsongrass affected both crops more than resistant johnsongrass.
- Taxon
- cornZea mays subsp. mayse1
- Material
- Se0
- Interactor
- johnsongrassSorghum halepensee1weed
- Outcome
- both crops were affectede0
- Direction
- moree0
- Comparator
- R populatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both crops were affected more by the S than by the R population.”
e1“The aboveground biomass of corn was reduced to a greater extent than sunflower by the presence of both johnsongrass populations, while both crops were affected more by the S than by the R population.”
Claim · model-written summary
Authors conclude that resistant johnsongrass growth and competitive ability are not associated with its resistance mechanism.
- Taxon
- johnsongrassSorghum halepensee0
- Material
- ALS-resistant johnsongrass populatione0
- Gene
- ALS Genet0
- Outcome
- growth rate and competitive abilitye0
- Direction
- not associatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the growth rate and competitive ability of the ALS-resistant johnsongrass population are not associated with the resistance mechanism involved.”
t0“ALS Gene”