Abstract
Glasshouse and laboratory experiments were conducted to evaluate the relative fitness of Cry1A-susceptible and laboratory-selected resistant strains of Helicoverpa armigera (Hübner). Life history parameters of H. armigera larvae feeding on young cotton plants showed a significant developmental delay of up to 7 d for the resistant strain compared with the susceptible strain on non-Bacillus thuringiensis (Bt) cotton. This fitness cost was not evident on artificial diet. There was no developmental delay in the F1 hybrid progeny from the reciprocal backcross of the resistant and susceptible strains, indicating that the fitness cost is recessive. In two cohorts tested, survival to pupation of resistant larvae on Bt cotton expressing Cry1Ac was 54 and 51% lower than on non-Bt cotton, whereas all susceptible and F1 larvae tested on Cry1Ac cotton were killed. Mortality of susceptible larvae occurred in the first or second instar, whereas the F1 larvae were able to develop to later instars before dying, demonstrating that resistance is incompletely recessive. The intrinsic rate of increase was reduced by >50% in the resistant strain on Cry1Ac cotton compared with the susceptible strain on non-Bt cotton. There was a significant reduction in the survival of postdiapausal adults from the resistant strain and the F1 strains, indicating that there is a nonrecessive overwintering cost associated with Cry1A resistance in H. armigera.
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Claims 9
Claim · model-written summary
Resistant H. armigera larvae on non-Bt cotton had a developmental delay of up to 7 d compared with the susceptible strain.
- Taxon
- cotton
Gossypium hirsutumt0 - Material
- resistant straine1
- Organ / stage
- larvaee1
- Treatment
- non-Bacillus thuringiensis (Bt) cottone1
- Interactor
- H. armigera
_gusano_cogollero.png?width=60)
Helicoverpa armigerae1pest - Outcome
- developmental delaye1
- Direction
- delaye1
- Value
- up to 7 de1
- Comparator
- susceptible straine1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_gusano_cogollero.png?width=500)
Verbatim
t0“Conventional and Transgenic Cotton”
e1“Life history parameters of H. armigera larvae feeding on young cotton plants showed a significant developmental delay of up to 7 d for the resistant strain compared with the susceptible strain on non-Bacillus thuringiensis (Bt) cotton”
Claim · model-written summary
The fitness cost of resistance was not evident for H. armigera on artificial diet.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- artificial diete2
- Interactor
- Helicoverpa armigeraHelicoverpa armigerat1pest
- Outcome
- fitness coste2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Conventional and Transgenic Cotton”
e2“This fitness cost was not evident on artificial diet”
t1“Helicoverpa armigera”
Claim · model-written summary
F1 hybrid progeny of resistant and susceptible H. armigera showed no developmental delay.
- Taxon
- cottonGossypium hirsutumt0
- Material
- F1 hybrid progenye3
- Interactor
- Helicoverpa armigeraHelicoverpa armigerat1pest
- Outcome
- developmental delaye3
- Direction
- no_changeinferrede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Conventional and Transgenic Cotton”
e3“There was no developmental delay in the F1 hybrid progeny from the reciprocal backcross of the resistant and susceptible strains”
t1“Helicoverpa armigera”
Claim · model-written summary
Survival to pupation of resistant larvae on Bt cotton expressing Cry1Ac was 54 and 51% lower than on non-Bt cotton.
- Taxon
- cottonGossypium hirsutumt0
- Material
- resistant larvaee4
- Treatment
- Bt cotton expressing Cry1Ace4
- Interactor
- Helicoverpa armigeraHelicoverpa armigerat1pest
- Outcome
- survival to pupatione4
- Direction
- lowere4
- Value
- 54 and 51%e4
- Comparator
- non-Bt cottone4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Conventional and Transgenic Cotton”
e4“survival to pupation of resistant larvae on Bt cotton expressing Cry1Ac was 54 and 51% lower than on non-Bt cotton”
t1“Helicoverpa armigera”
Claim · model-written summary
All susceptible and F1 larvae on Cry1Ac cotton were killed.
- Taxon
- cottonGossypium hirsutumt0
- Material
- susceptible and F1 larvaee5
- Treatment
- Cry1Ac cottone5
- Interactor
- Helicoverpa armigeraHelicoverpa armigerat1pest
- Outcome
- killede5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Conventional and Transgenic Cotton”
e5“all susceptible and F1 larvae tested on Cry1Ac cotton were killed”
t1“Helicoverpa armigera”
Claim · model-written summary
Mortality of susceptible larvae on cotton occurred in the first or second instar.
- Taxon
- cottonGossypium hirsutumt0
- Material
- susceptible larvaee6
- Organ / stage
- first or second instare6
- Interactor
- Helicoverpa armigeraHelicoverpa armigerat1pest
- Outcome
- Mortalitye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Conventional and Transgenic Cotton”
e6“Mortality of susceptible larvae occurred in the first or second instar”
t1“Helicoverpa armigera”
Claim · model-written summary
F1 larvae developed to later instars before dying.
- Taxon
- cottonGossypium hirsutumt0
- Material
- F1 larvaee7
- Interactor
- Helicoverpa armigeraHelicoverpa armigerat1pest
- Outcome
- develop to later instarse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Conventional and Transgenic Cotton”
e7“whereas the F1 larvae were able to develop to later instars before dying”
t1“Helicoverpa armigera”
Claim · model-written summary
The intrinsic rate of increase of resistant H. armigera on Cry1Ac cotton was reduced by more than 50% compared with susceptible larvae on non-Bt cotton.
- Taxon
- cottonGossypium hirsutumt0
- Material
- resistant straine1
- Treatment
- Cry1Ac cottone1
- Interactor
- Helicoverpa armigeraHelicoverpa armigerat1pest
- Outcome
- intrinsic rate of increasee1
- Direction
- reducede1
- Value
- >50%e1
- Comparator
- susceptible strain on non-Bt cottone1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Conventional and Transgenic Cotton”
e1“The intrinsic rate of increase was reduced by >50% in the resistant strain on Cry1Ac cotton compared with the susceptible strain on non-Bt cotton”
t1“Helicoverpa armigera”
Claim · model-written summary
Survival of postdiapausal adults was significantly reduced in the resistant and F1 strains.
- Taxon
- cottonGossypium hirsutumt0
- Material
- resistant straine1
- Interactor
- Helicoverpa armigeraHelicoverpa armigerat1pest
- Outcome
- survival of postdiapausal adultse1
- Direction
- reductione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Conventional and Transgenic Cotton”
e1“There was a significant reduction in the survival of postdiapausal adults from the resistant strain and the F1 strains”
t1“Helicoverpa armigera”
The same questions in other papers
transgenic · Helicoverpa armigera · Gossypium hirsutum (cotton)Positive and negative results
13 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
12 papers more in this group
See all 16 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.