Abstract
Vast rainfed lowland areas in Asia periodically experience flash floods that adversely affect the survival and productivity of rice (Oryza sativa L.). Progress has been made in developing tolerant germplasm, but fewer efforts have been devoted to developing proper management options for flood-prone areas. The effects of silica application (600 kg SiO2 ha ) in soil 1 d before sowing on the growth and survival of 21-dold seedlings submerged for 12 d were evaluated in two experiments. Four contrasting cultivars, tolerant IR49830-7-1-2-3 and Swarna-Sub1 and intolerant IR42 and Swarna, were used. Dry weight, chlorophyll concentration, shoot length, and non-structural carbohydrates were measured before and after complete submergence, and survival was determined 21 d after de-submergence. Survival of all genotypes decreased substantially in Si-treated seedlings, with the tolerant genotypes showing consistently higher survival. No significant interaction was observed between Si treatment and genotypes varying in tolerance of flooding. Si-treated seedlings had lower root dry weight and root-shoot biomass ratio, and greater chlorophyll concentration before submergence. Greater shoot elongation and higher reduction in levels of chlorophyll and non-structural carbohydrate concentrations during complete submergence and greater chlorophyllase activity 1 d after de-submergence were observed in Si-treated seedlings than in the control, and similarly in the sensitive genotypes than in tolerant ones. Survival was negatively correlated with chlorophyll degradation, extent of non-structural carbohydrate depletion, and shoot elongation during submergence. Apparently, excessive Si application in soil 1 d before sowing has negative consequences on seedling growth and survival after complete submergence at vegetative stage in rice.
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Claims 11
Claim · model-written summary
Silica application before sowing decreased survival of all rice genotypes after submergence.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- 21-dold seedlingse1
- Treatment
- silica applicatione1
- Outcome
- Survival of all genotypese2
- Direction
- decreasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e1“The effects of silica application (600 kg SiO2 ha ) in soil 1 d before sowing on the growth and survival of 21-dold seedlings submerged for 12 d were evaluated in two experiments”
e2“Survival of all genotypes decreased substantially in Si-treated seedlings, with the tolerant genotypes showing consistently higher survival”
Claim · model-written summary
Tolerant rice genotypes showed higher survival than intolerant ones.
- Taxon
- riceOryza sativae0
- Material
- tolerant genotypese2
- Outcome
- survivale2
- Direction
- highere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e2“Survival of all genotypes decreased substantially in Si-treated seedlings, with the tolerant genotypes showing consistently higher survival”
Claim · model-written summary
No significant interaction was found between silica treatment and genotypes varying in flooding tolerance.
- Taxon
- riceOryza sativae0
- Outcome
- interactione3
- Qualifier
- between Si treatment and genotypes varying in tolerance of floodinge3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e3“No significant interaction was observed between Si treatment and genotypes varying in tolerance of flooding”
Claim · model-written summary
Si-treated rice seedlings had lower root dry weight and root-shoot biomass ratio.
- Taxon
- riceOryza sativae0
- Treatment
- Si-treatede4
- Outcome
- root dry weight and root-shoot biomass ratioe4
- Direction
- lowere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e4“Si-treated seedlings had lower root dry weight and root-shoot biomass ratio, and greater chlorophyll concentration before submergence”
Claim · model-written summary
Si-treated rice seedlings had greater chlorophyll concentration before submergence.
- Taxon
- riceOryza sativae0
- Treatment
- Si-treatede4
- Outcome
- chlorophyll concentratione4
- Direction
- greatere4
- Qualifier
- before submergencee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e4“Si-treated seedlings had lower root dry weight and root-shoot biomass ratio, and greater chlorophyll concentration before submergence”
Claim · model-written summary
During complete submergence, Si-treated seedlings had greater shoot elongation than the control.
- Taxon
- riceOryza sativae0
- Treatment
- Si-treatede5
- Outcome
- shoot elongatione5
- Direction
- Greatere5
- Qualifier
- during complete submergencee5
- Comparator
- controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e5“Greater shoot elongation and higher reduction in levels of chlorophyll and non-structural carbohydrate concentrations during complete submergence and greater chlorophyllase activity 1 d after de-submergence were observed in Si-treated seedlings than in the control, and similarly in the sensitive genotypes than in tolerant ones”
Claim · model-written summary
During complete submergence, Si-treated seedlings showed a higher reduction in chlorophyll and non-structural carbohydrate concentrations than the control.
- Taxon
- riceOryza sativae0
- Treatment
- Si-treatede5
- Outcome
- levels of chlorophyll and non-structural carbohydrate concentrationse5
- Direction
- higher reductione5
- Qualifier
- during complete submergencee5
- Comparator
- controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e5“Greater shoot elongation and higher reduction in levels of chlorophyll and non-structural carbohydrate concentrations during complete submergence and greater chlorophyllase activity 1 d after de-submergence were observed in Si-treated seedlings than in the control, and similarly in the sensitive genotypes than in tolerant ones”
Claim · model-written summary
Si-treated rice seedlings had greater chlorophyllase activity 1 d after de-submergence than the control.
- Taxon
- riceOryza sativae0
- Treatment
- Si-treatede5
- Outcome
- chlorophyllase activitye5
- Direction
- greatere5
- Qualifier
- 1 d after de-submergencee5
- Comparator
- controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e5“Greater shoot elongation and higher reduction in levels of chlorophyll and non-structural carbohydrate concentrations during complete submergence and greater chlorophyllase activity 1 d after de-submergence were observed in Si-treated seedlings than in the control, and similarly in the sensitive genotypes than in tolerant ones”
Claim · model-written summary
Sensitive rice genotypes showed similar responses to Si in shoot elongation as tolerant ones.
- Taxon
- riceOryza sativae0
- Material
- sensitive genotypese5
- Outcome
- shoot elongatione5
- Direction
- similarlye5
- Comparator
- tolerant onese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e5“Greater shoot elongation and higher reduction in levels of chlorophyll and non-structural carbohydrate concentrations during complete submergence and greater chlorophyllase activity 1 d after de-submergence were observed in Si-treated seedlings than in the control, and similarly in the sensitive genotypes than in tolerant ones”
Claim · model-written summary
Survival of rice seedlings was negatively correlated with chlorophyll degradation, non-structural carbohydrate depletion and shoot elongation during submergence.
- Taxon
- riceOryza sativae0
- Treatment
- submergencee6
- Outcome
- Survivale6
- Direction
- negatively correlatede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e6“Survival was negatively correlated with chlorophyll degradation, extent of non-structural carbohydrate depletion, and shoot elongation during submergence”
Claim · model-written summary
Excessive silica application before sowing apparently has negative consequences for rice seedling growth and survival after complete submergence at the vegetative stage.
- Taxon
- riceOryza sativae7
- Organ / stage
- vegetative stagee7
- Treatment
- excessive Si application in soil 1 d before sowinge7
- Outcome
- seedling growth and survivale7
- Direction
- negativee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the survival and productivity of rice (Oryza sativa L.)”
e7“Apparently, excessive Si application in soil 1 d before sowing has negative consequences on seedling growth and survival after complete submergence at vegetative stage in rice”
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