Abstract
Rice (Oryza sativa L.) blast disease caused by Magnaporthe grisea is one of the most destructive diseases in the rice-growing areas of the world. Silicon is an important nutritional element especially for rice. Two near-isogenic lines of rice with different resistance to blast disease, i.e. CO39 (susceptible) and C101LAC (Pi-1) (resistant), were selected to determine the effects of Si amendment on the severity and incidence of rice blast disease. The physiological and cytological mechanisms involved in the induced disease resistance by silicon were investigated. Exogenous Si application at a concentration of 2 mM reduced the disease index by 45% for CO39 and 56% for C101LAC (Pi-1). Si application alone did not change lignin content and the activities of defense-related enzymes including peroxidase (POD), polyphenol oxidase (PPO) and phenylalanine ammonia-lyase (PAL) in rice leaves of both isogenic lines. However, after inoculation with M. grisea, Si-treated rice plants significantly increased the activities of POD, PPO and PAL in leaves of both isogenic lines. Si and lignin content were also significantly increased in Si-treated inoculated seedlings. Environmental scanning electron microscope observations revealed that Si amendment resulted in higher Si deposit on dumbbell bodies in the rice leaves and silicon papilla accumulation on the guard cell of stoma. These results suggest that silicon-induced defense response and cell silicification of rice leaves altogether contribute to the silicon-induced rice resistance to blast disease.
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Claims 9
Claim · model-written summary
Exogenous Si at 2 mM reduced the rice blast disease index by 45% in CO39.
- Taxon
- Rice
Oryza sativae0 - Material
- CO39e1
- Treatment
- Exogenous Si application at a concentration of 2 mMe1
- Interactor
- Magnaporthe grisea
Pyricularia griseae0pathogen - Outcome
- disease indexe1
- Direction
- reducede1
- Value
- 45%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) blast disease caused by Magnaporthe grisea”
e1“Exogenous Si application at a concentration of 2 mM reduced the disease index by 45% for CO39 and 56% for C101LAC (Pi-1)”
Claim · model-written summary
Exogenous Si at 2 mM reduced the rice blast disease index by 56% in C101LAC (Pi-1).
- Taxon
- RiceOryza sativae0
- Material
- C101LAC (Pi-1)e1
- Treatment
- Exogenous Si application at a concentration of 2 mMe1
- Interactor
- Magnaporthe griseaPyricularia griseae0pathogen
- Outcome
- disease indexe1
- Direction
- reducede1
- Value
- 56%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) blast disease caused by Magnaporthe grisea”
e1“Exogenous Si application at a concentration of 2 mM reduced the disease index by 45% for CO39 and 56% for C101LAC (Pi-1)”
Claim · model-written summary
Si application alone did not change rice leaf lignin content.
- Taxon
- riceOryza sativae2
- Organ / stage
- leavese2
- Treatment
- Si application alonee2
- Outcome
- lignin contente2
- Direction
- did not changee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Si application alone did not change lignin content and the activities of defense-related enzymes including peroxidase (POD), polyphenol oxidase (PPO) and phenylalanine ammonia-lyase (PAL) in rice leaves of both isogenic lines”
Claim · model-written summary
Si application alone did not change the activities of POD, PPO and PAL in rice leaves.
- Taxon
- riceOryza sativae2
- Organ / stage
- leavese2
- Treatment
- Si application alonee2
- Gene
- peroxidase (POD), polyphenol oxidase (PPO) and phenylalanine ammonia-lyase (PAL)e2
- Outcome
- activities of defense-related enzymese2
- Direction
- did not changee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Si application alone did not change lignin content and the activities of defense-related enzymes including peroxidase (POD), polyphenol oxidase (PPO) and phenylalanine ammonia-lyase (PAL) in rice leaves of both isogenic lines”
Claim · model-written summary
After M. grisea inoculation, Si-treated rice significantly increased the activities of POD, PPO and PAL in leaves.
- Taxon
- riceOryza sativae3
- Organ / stage
- leavese3
- Treatment
- Si-treatede3
- Interactor
- M. griseaPyricularia griseae3pathogen
- Outcome
- activities of POD, PPO and PALe3
- Direction
- significantly increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) blast disease caused by Magnaporthe grisea”
e3“after inoculation with M. grisea, Si-treated rice plants significantly increased the activities of POD, PPO and PAL in leaves of both isogenic lines”
Claim · model-written summary
Si and lignin content increased significantly in Si-treated inoculated rice seedlings.
- Taxon
- RiceOryza sativae0
- Organ / stage
- seedlingse4
- Treatment
- Si-treatede4
- Outcome
- Si and lignin contente4
- Direction
- significantly increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) blast disease caused by Magnaporthe grisea”
e4“Si and lignin content were also significantly increased in Si-treated inoculated seedlings”
Claim · model-written summary
Si amendment gave higher Si deposits on dumbbell bodies in rice leaves.
- Taxon
- RiceOryza sativae0
- Organ / stage
- dumbbell bodiese5
- Treatment
- Si amendmente5
- Outcome
- Si deposit on dumbbell bodiese5
- Direction
- highere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) blast disease caused by Magnaporthe grisea”
e5“Si amendment resulted in higher Si deposit on dumbbell bodies in the rice leaves and silicon papilla accumulation on the guard cell of stoma”
Claim · model-written summary
Si amendment increased silicon papilla accumulation on guard cells of rice stomata.
- Taxon
- RiceOryza sativae0
- Organ / stage
- guard cell of stomae5
- Treatment
- Si amendmente5
- Outcome
- silicon papilla accumulatione5
- Direction
- increaseinferrede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) blast disease caused by Magnaporthe grisea”
e5“Si amendment resulted in higher Si deposit on dumbbell bodies in the rice leaves and silicon papilla accumulation on the guard cell of stoma”
Claim · model-written summary
Silicon-induced defense response and cell silicification of rice leaves are suggested to contribute to silicon-induced resistance to blast disease.
- Taxon
- riceOryza sativae6
- Outcome
- resistance to blast diseasee6
- Qualifier
- silicon-induced defense response and cell silicificatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“silicon-induced defense response and cell silicification of rice leaves altogether contribute to the silicon-induced rice resistance to blast disease”
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See all 73 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.