Abstract
Frogeye leaf spot, caused by Cercospora sojina, is one of the most important leaf diseases of soybean worldwide. Silicon (Si) is known to increase the resistance of several plant species to pathogens. The cultivars Bossier and Conquista, which are susceptible and resistant, respectively, to frogeye leaf spot, supplied and nonsupplied with Si were examined for the activities of defense enzymes and the concentrations of total soluble phenolics (TSP) and lignin-thioglycolic acid (LTGA) derivatives at 8, 14, and 16 days after inoculation (dai) with C. sojina. The importance of cell wall degrading enzymes (CWDE) to the infection process of C. sojina and the effect of Si on their activities were also determined. Soybean plants were grown in hydroponic culture containing either 0 or 2 mM Si (-Si and +Si, respectively) and noninoculated or C. sojina inoculated. Severity of frogeye leaf spot was higher in cultivar Bossier plants than cultivar Conquista and also in the +Si plants compared with their -Si counterparts. Except for the concentrations of TSP and LTGA derivatives, activities of defense enzymes and the CWDE did not change for +Si noninoculated plants regardless of the cultivar. The activities of lipoxygenases, phenylalanine ammonia-lyases, chitinases, and polyphenoloxidases as well as the activities of CWDE decreased for the +Si inoculated plants. The results from this study demonstrated that defense enzyme activities decreased in soybean plants supplied with Si, which compromised resistance to C. sojina infection.
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Claims 5
Claim · model-written summary
Frogeye leaf spot severity was higher in Bossier than Conquista.
- Taxon
- Soybean
Glycine maxt0 - Material
- Bossiere0
- Interactor
- Cercospora sojina
Cercospora sojinae1pathogen - Outcome
- Severity of frogeye leaf spote0
- Direction
- highere0
- Comparator
- Conquistae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severity of frogeye leaf spot was higher in cultivar Bossier plants than cultivar Conquista”
t0“Soybean”
e1“caused by Cercospora sojina”
Claim · model-written summary
Silicon supplied plants had higher frogeye leaf spot severity than nonsupplied plants.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- +Sie0
- Interactor
- Cercospora sojinaCercospora sojinae1pathogen
- Outcome
- Severity of frogeye leaf spote0
- Direction
- highere0
- Comparator
- -Sie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severity of frogeye leaf spot was higher in cultivar Bossier plants than cultivar Conquista and also in the +Si plants compared with their -Si counterparts.”
t0“Soybean”
e1“caused by Cercospora sojina”
Claim · model-written summary
Except for TSP and LTGA concentrations, defense enzyme and CWDE activities did not change in silicon supplied noninoculated plants.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- +Sie0
- Outcome
- activities of defense enzymes and the CWDEe0
- Direction
- did not changee0
- Qualifier
- noninoculated plants regardless of the cultivare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for the concentrations of TSP and LTGA derivatives, activities of defense enzymes and the CWDE did not change for +Si noninoculated plants regardless of the cultivar.”
t0“Soybean”
Claim · model-written summary
Silicon decreased lipoxygenase, phenylalanine ammonia-lyase, chitinase and polyphenoloxidase activities in inoculated plants.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- +Sie0
- Outcome
- activities of lipoxygenases, phenylalanine ammonia-lyases, chitinases, and polyphenoloxidasese0
- Direction
- decreasede0
- Qualifier
- inoculated plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of lipoxygenases, phenylalanine ammonia-lyases, chitinases, and polyphenoloxidases as well as the activities of CWDE decreased for the +Si inoculated plants.”
t0“Soybean”
Claim · model-written summary
Silicon decreased cell wall degrading enzyme activities in inoculated plants.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- +Sie0
- Outcome
- activities of CWDEe0
- Direction
- decreasede0
- Qualifier
- inoculated plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activities of CWDE decreased for the +Si inoculated plants.”
t0“Soybean”
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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.