Abstract
This study investigated how a defect in the active uptake of silicon (Si) affects rice resistance to brown spot. Plants from a rice mutant (low silicon 1 [lsi1]) and its wild-type counterpart (cv. Oochikara), growing in hydroponic culture with (+Si; 2 mM) or without (-Si) Si, were inoculated with Bipolaris oryzae. Si concentration in leaf tissue of cv. Oochikara and the lsi1 mutant increased by 381 and 263%, respectively, for the +Si treatment compared with the -Si treatment. The incubation period was 6 h longer in the presence of Si. The area under brown spot progress curve for plants from cv. Oochikara and the lsi1 mutant was reduced 81 and 50%, respectively, in the presence of Si. The reduced number of brown epidermal cells on leaves from cv. Oochikara and the lsi1 mutant supplied with Si contributed to the lower lipid peroxidation and electrolyte leakage. The concentration of total soluble phenolics in cv. Oochikara supplied with Si (values of 4.2 to 15.4 μg g(-1) fresh weight) was greater compared with plants not supplied with Si (values of 1.9 to 11.5 μg g(-1) fresh weight). The concentration of lignin was also important to the resistance of cv. Oochikara and the lsi1 mutant. Polyphenoloxidase activity did not contribute to the resistance of cv. Oochikara and the lsi1 mutant to brown spot, regardless of Si supply. Peroxidase and chitinase activities were higher in cv. Oochikara and the lsi1 mutant supplied with Si. These results bring novel evidence of the involvement of Si in a more complex defense mechanism than simply the formation of a physical barrier to avoid or delay fungal penetration.
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Claims 10
Claim · model-written summary
Si supply increased leaf Si concentration in cv. Oochikara by 381% compared with -Si.
- Taxon
- rice
Oryza sativae0 - Material
- cv. Oochikarae1
- Organ / stage
- leaf tissuee1
- Treatment
- +Si treatmente1
- Outcome
- Si concentratione1
- Direction
- increasede1
- Value
- 381e1
- Comparator
- -Si treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“affects rice resistance to brown spot”
e1“Si concentration in leaf tissue of cv. Oochikara and the lsi1 mutant increased by 381 and 263%, respectively, for the +Si treatment compared with the -Si treatment”
Claim · model-written summary
Si supply increased leaf Si concentration in the lsi1 mutant by 263% compared with -Si.
- Taxon
- riceOryza sativae0
- Material
- lsi1 mutante1
- Organ / stage
- leaf tissuee1
- Treatment
- +Si treatmente1
- Outcome
- Si concentratione1
- Direction
- increasede1
- Value
- 263%e1
- Comparator
- -Si treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“affects rice resistance to brown spot”
e1“Si concentration in leaf tissue of cv. Oochikara and the lsi1 mutant increased by 381 and 263%, respectively, for the +Si treatment compared with the -Si treatment”
Claim · model-written summary
Si presence lengthened the Bipolaris oryzae incubation period on rice by 6 h.
- Taxon
- riceOryza sativae0
- Treatment
- in the presence of Sie3
- Interactor
- Bipolaris oryzae
Bipolaris oryzaee2pathogen - Outcome
- incubation periode3
- Direction
- longere3
- Value
- 6 he3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“affects rice resistance to brown spot”
e2“were inoculated with Bipolaris oryzae”
e3“The incubation period was 6 h longer in the presence of Si”
Claim · model-written summary
Si presence reduced brown spot area under the progress curve by 81% in cv. Oochikara.
- Taxon
- riceOryza sativae0
- Material
- cv. Oochikarae4
- Treatment
- in the presence of Sie4
- Interactor
- Bipolaris oryzaeBipolaris oryzaee2pathogen
- Outcome
- area under brown spot progress curvee4
- Direction
- reducede4
- Value
- 81e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“affects rice resistance to brown spot”
e2“were inoculated with Bipolaris oryzae”
e4“The area under brown spot progress curve for plants from cv. Oochikara and the lsi1 mutant was reduced 81 and 50%, respectively, in the presence of Si”
Claim · model-written summary
Si presence reduced brown spot area under the progress curve by 50% in the lsi1 mutant.
- Taxon
- riceOryza sativae0
- Material
- lsi1 mutante4
- Treatment
- in the presence of Sie4
- Interactor
- Bipolaris oryzaeBipolaris oryzaee2pathogen
- Outcome
- area under brown spot progress curvee4
- Direction
- reducede4
- Value
- 50%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“affects rice resistance to brown spot”
e2“were inoculated with Bipolaris oryzae”
e4“The area under brown spot progress curve for plants from cv. Oochikara and the lsi1 mutant was reduced 81 and 50%, respectively, in the presence of Si”
Claim · model-written summary
Fewer brown epidermal cells on leaves contributed to lower lipid peroxidation and electrolyte leakage in cv. Oochikara and the lsi1 mutant.
- Taxon
- riceOryza sativae0
- Material
- cv. Oochikara and the lsi1 mutante5
- Organ / stage
- leavese5
- Outcome
- lipid peroxidation and electrolyte leakagee5
- Qualifier
- reduced number of brown epidermal cellse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“affects rice resistance to brown spot”
e5“The reduced number of brown epidermal cells on leaves from cv. Oochikara and the lsi1 mutant supplied with Si contributed to the lower lipid peroxidation and electrolyte leakage”
Claim · model-written summary
Total soluble phenolics were greater in cv. Oochikara supplied with Si than in plants not supplied with Si.
- Taxon
- riceOryza sativae0
- Material
- cv. Oochikarae6
- Treatment
- supplied with Sie6
- Outcome
- concentration of total soluble phenolicse6
- Direction
- greatere6
- Value
- 4.2 to 15.4 μg g(-1) fresh weighte6
- Qualifier
- 1.9 to 11.5 μg g(-1) fresh weighte6
- Comparator
- not supplied with Sie6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“affects rice resistance to brown spot”
e6“The concentration of total soluble phenolics in cv. Oochikara supplied with Si (values of 4.2 to 15.4 μg g(-1) fresh weight) was greater compared with plants not supplied with Si (values of 1.9 to 11.5 μg g(-1) fresh weight)”
Claim · model-written summary
Lignin concentration was important to the resistance of cv. Oochikara and the lsi1 mutant; direction not stated.
- Taxon
- riceOryza sativae0
- Material
- cv. Oochikara and the lsi1 mutante7
- Compound
- lignine7
- Outcome
- resistancee7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“affects rice resistance to brown spot”
e7“The concentration of lignin was also important to the resistance of cv. Oochikara and the lsi1 mutant”
Claim · model-written summary
Polyphenoloxidase activity did not contribute to resistance of cv. Oochikara and the lsi1 mutant to brown spot, with or without Si.
- Taxon
- riceOryza sativae0
- Material
- cv. Oochikara and the lsi1 mutante1
- Gene
- Polyphenoloxidasee1
- Outcome
- resistancee1
- Direction
- no_changeinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“affects rice resistance to brown spot”
e1“Polyphenoloxidase activity did not contribute to the resistance of cv. Oochikara and the lsi1 mutant to brown spot, regardless of Si supply”
Claim · model-written summary
Peroxidase and chitinase activities were higher in cv. Oochikara and the lsi1 mutant supplied with Si.
- Taxon
- riceOryza sativae0
- Material
- cv. Oochikara and the lsi1 mutante1
- Treatment
- supplied with Sie1
- Gene
- Peroxidase and chitinasee1
- Outcome
- activitiese1
- Direction
- highere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“affects rice resistance to brown spot”
e1“Peroxidase and chitinase activities were higher in cv. Oochikara and the lsi1 mutant supplied with Si”
The same questions in other papers
silicon atom · quality: phytochemicals · Oryza sativa (rice)Positive and negative results
6 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- negative
6 papers more in this group
See all 10 papers →silicon atom · Bipolaris oryzae · Oryza sativa (rice)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.