Abstract
Expression of resistance to early leaf spot disease of peanut, caused by Cercospora arachidicola, varies across diverse geographic locations. Environment is known to influence expression of partial resistance in some pathosystems and could affect stability of resistance to early leaf spot. Multiple components of resistance were studied at controlled temperatures on seven peanut genotypes selected at North Carolina State University and on six genotypes selected at ICRISAT in West Africa. The genotypes were inoculated with a North Carolina field isolate of C. arachidicola and incubated under day/night temperature regimes of 24/24, 26/20, 32/26, 38/26, and 38/32 C (the high-temperature regimes simulate the conditions in Niger, West Africa, and the cooler regimes simulate the conditions in North Carolina). Numbers of lesions were inversely related to temperature. Days after inoculation significantly influenced numbers of lesions and infection frequency. Regression of lesion numbers or infection frequencies on time and temperature accounted for 90% or more of experimental variation for 12 of 13 genotypes. Values for most resistance components examined (number of lesions, infection frequency, incubation period, lesion diameter, and necrotic area diameter) were dependent on both temperature and genotype. Several peanut genotypes were identified that expressed stable levels of resistance to C. arachidicola across temperature regimes. The North Carolina line 91 PA 150, derived from the wild diploid species Arachis cardenasii, consistently was ranked as resistant for all components in all temperature regimes. Other genotypes that ranked high in partial resistance to C. arachidicola included NC Ac 17894, PI 274194, NC Ac 18045, and 91 PA 131. Another group of genotypes, including GP-NC 343, NC 6, and N92069L, were moderately resistant. PI 476033 and NC 7 were highly susceptible at all temperatures, and N92064L varied in ranking for components
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Claims 10
Claim · model-written summary
Numbers of lesions on peanut were inversely related to temperature, falling as temperature rose.
- Taxon
- Peanut
Arachis hypogaeat0 - Treatment
- temperaturee0
- Outcome
- Numbers of lesionse0
- Direction
- decreaseinferrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Numbers of lesions were inversely related to temperature”
t0“Peanut”
Claim · model-written summary
Days after inoculation significantly influenced the numbers of lesions and the infection frequency on peanut; no direction is given.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- Days after inoculatione0
- Outcome
- numbers of lesions and infection frequencye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Days after inoculation significantly influenced numbers of lesions and infection frequency”
t0“Peanut”
Claim · model-written summary
Regression of lesion numbers or infection frequencies on time and temperature accounted for 90% or more of the experimental variation for 12 of 13 peanut genotypes.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- time and temperaturee0
- Outcome
- experimental variatione0
- Value
- 90% or moree0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regression of lesion numbers or infection frequencies on time and temperature accounted for 90% or more of experimental variation for 12 of 13 genotypes”
t0“Peanut”
Claim · model-written summary
Values of most resistance components (lesion number, infection frequency, incubation period, lesion diameter, necrotic area diameter) depended on both temperature and genotype in peanut.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- temperaturee0
- Outcome
- resistance componentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Values for most resistance components examined (number of lesions, infection frequency, incubation period, lesion diameter, and necrotic area diameter) were dependent on both temperature and genotype”
t0“Peanut”
Claim · model-written summary
Several peanut genotypes expressed stable levels of resistance to C. arachidicola across temperature regimes.
- Taxon
- peanutArachis hypogaeae0
- Interactor
- C. arachidicolaMycosphaerella arachidise0pathogen
- Outcome
- stable levels of resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Several peanut genotypes were identified that expressed stable levels of resistance to C. arachidicola across temperature regimes”
Claim · model-written summary
The North Carolina line 91 PA 150, derived from wild Arachis cardenasii, was consistently ranked resistant for all components in all temperature regimes.
- Taxon
- PeanutArachis hypogaeat0
- Material
- 91 PA 150e0
- Outcome
- ranked as resistante0
- Qualifier
- in all temperature regimese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The North Carolina line 91 PA 150, derived from the wild diploid species Arachis cardenasii, consistently was ranked as resistant for all components in all temperature regimes”
t0“Peanut”
Claim · model-written summary
Peanut genotypes NC Ac 17894, PI 274194, NC Ac 18045 and 91 PA 131 ranked high in partial resistance to C. arachidicola.
- Taxon
- PeanutArachis hypogaeat0
- Material
- NC Ac 17894, PI 274194, NC Ac 18045, and 91 PA 131e0
- Interactor
- C. arachidicolaMycosphaerella arachidise0pathogen
- Outcome
- partial resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Other genotypes that ranked high in partial resistance to C. arachidicola included NC Ac 17894, PI 274194, NC Ac 18045, and 91 PA 131”
t0“Peanut”
Claim · model-written summary
Peanut genotypes GP-NC 343, NC 6 and N92069L were moderately resistant.
- Taxon
- PeanutArachis hypogaeat0
- Material
- GP-NC 343, NC 6, and N92069Le0
- Outcome
- moderately resistante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Another group of genotypes, including GP-NC 343, NC 6, and N92069L, were moderately resistant”
t0“Peanut”
Claim · model-written summary
Peanut genotypes PI 476033 and NC 7 were highly susceptible at all temperatures.
- Taxon
- PeanutArachis hypogaeat0
- Material
- PI 476033 and NC 7e0
- Outcome
- highly susceptiblee0
- Qualifier
- at all temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PI 476033 and NC 7 were highly susceptible at all temperatures”
t0“Peanut”
Claim · model-written summary
Peanut genotype N92064L varied in its ranking among resistance components.
- Taxon
- PeanutArachis hypogaeat0
- Material
- N92064Le0
- Outcome
- varied in rankinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N92064L varied in ranking for components”
t0“Peanut”