Abstract
Impact of elevated temperature on physiological and biochemical changes were evaluated in 5 commercial sugarcane genotypes and 2 wild species clones at two different growth phases. The study revealed that heat stress decreased chlorophyll content, chlorophyll stability index (CSI), SPAD value, maximum quantum efficiency of PSII photochemistry (F v /F m ratio), leaf gas exchange parameters, relative water content (RWC), and activities of nitrate reductase (NR), sucrose-metabolizing enzymes (SPS, SS, AI, NI) in all the genotypes and species clones. In contrast, elevated temperature induced an increase in proline, total phenolics content (TP), antioxidant enzyme activities (SOD and POX), lipid peroxidation (LP), membrane injury index (MII) and soluble sugar content in all clones. Principal component analysis based on physiological heat tolerance indexes could clearly distinguish sugarcane genotypes into three heat tolerance clusters. Noteworthy in comparison to the heat-sensitive varieties, sugarcane genotype that possessed higher degrees of heat tolerance Co 99004 displayed higher chlorophyll content, CSI, antioxidant enzyme activities, NR activity, RWC, total phenols, sucrose-metabolizing enzymes, soluble sugar content and leaf gas exchange and lower level of lipid peroxidation and membrane injury index.
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Claims 13
Claim · model-written summary
Heat reduced chlorophyll content, CSI and SPAD in all clones.
- Taxon
- sugarcanet0
- Treatment
- heat stresse0
- Outcome
- chlorophyll content, chlorophyll stability index (CSI), SPAD valuee0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“heat stress decreased chlorophyll content, chlorophyll stability index (CSI), SPAD value”
t0“sugarcane”
Claim · model-written summary
Heat reduced PSII efficiency and gas exchange in all clones.
- Taxon
- sugarcanet0
- Treatment
- heat stresse0
- Outcome
- maximum quantum efficiency of PSII photochemistry (F v /F m ratio), leaf gas exchange parameterse0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“heat stress decreased chlorophyll content, chlorophyll stability index (CSI), SPAD value, maximum quantum efficiency of PSII photochemistry (F v /F m ratio), leaf gas exchange parameters”
t0“sugarcane”
Claim · model-written summary
Heat reduced relative water content in all clones.
Not reportedComparator
Verbatim
e0“heat stress decreased chlorophyll content, chlorophyll stability index (CSI), SPAD value, maximum quantum efficiency of PSII photochemistry (F v /F m ratio), leaf gas exchange parameters, relative water content (RWC)”
t0“sugarcane”
Claim · model-written summary
Heat reduced nitrate reductase and sucrose-metabolizing enzyme activities.
- Taxon
- sugarcanet0
- Treatment
- heat stresse0
- Outcome
- activities of nitrate reductase (NR), sucrose-metabolizing enzymes (SPS, SS, AI, NI)e0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“heat stress decreased chlorophyll content, chlorophyll stability index (CSI), SPAD value, maximum quantum efficiency of PSII photochemistry (F v /F m ratio), leaf gas exchange parameters, relative water content (RWC), and activities of nitrate reductase (NR), sucrose-metabolizing enzymes (SPS, SS, AI, NI)”
t0“sugarcane”
Claim · model-written summary
Heat increased proline, total phenolics and soluble sugar content.
- Taxon
- sugarcanet0
- Treatment
- elevated temperaturee0
- Outcome
- proline, total phenolics content (TP)e0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“elevated temperature induced an increase in proline, total phenolics content (TP), antioxidant enzyme activities (SOD and POX), lipid peroxidation (LP), membrane injury index (MII) and soluble sugar content”
t0“sugarcane”
Claim · model-written summary
Heat increased antioxidant enzyme activities.
- Taxon
- sugarcanet0
- Treatment
- elevated temperaturee0
- Outcome
- antioxidant enzyme activities (SOD and POX)e0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“elevated temperature induced an increase in proline, total phenolics content (TP), antioxidant enzyme activities (SOD and POX)”
t0“sugarcane”
Claim · model-written summary
Heat increased lipid peroxidation and membrane injury.
- Taxon
- sugarcanet0
- Treatment
- elevated temperaturee0
- Outcome
- lipid peroxidation (LP), membrane injury index (MII)e0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“elevated temperature induced an increase in proline, total phenolics content (TP), antioxidant enzyme activities (SOD and POX), lipid peroxidation (LP), membrane injury index (MII)”
t0“sugarcane”
Claim · model-written summary
Heat increased soluble sugar content.
Not reportedComparator
Verbatim
e0“elevated temperature induced an increase in proline, total phenolics content (TP), antioxidant enzyme activities (SOD and POX), lipid peroxidation (LP), membrane injury index (MII) and soluble sugar content”
t0“sugarcane”
Claim · model-written summary
Physiological heat-tolerance indexes separated genotypes into three clusters.
Verbatim
e0“Principal component analysis based on physiological heat tolerance indexes could clearly distinguish sugarcane genotypes into three heat tolerance clusters”
Claim · model-written summary
Co 99004 had higher chlorophyll content, CSI and antioxidant enzyme activities than sensitive varieties.
Verbatim
e0“in comparison to the heat-sensitive varieties, sugarcane genotype that possessed higher degrees of heat tolerance Co 99004 displayed higher chlorophyll content, CSI, antioxidant enzyme activities”
Claim · model-written summary
Co 99004 had higher NR activity, RWC and total phenols.
Verbatim
e0“higher chlorophyll content, CSI, antioxidant enzyme activities, NR activity, RWC, total phenols”
e1“heat-sensitive varieties, sugarcane genotype that possessed higher degrees of heat tolerance Co 99004”
Claim · model-written summary
Co 99004 had higher sucrose-metabolizing enzymes, soluble sugar content and leaf gas exchange.
Verbatim
e0“higher chlorophyll content, CSI, antioxidant enzyme activities, NR activity, RWC, total phenols, sucrose-metabolizing enzymes, soluble sugar content and leaf gas exchange”
e1“heat-sensitive varieties, sugarcane genotype that possessed higher degrees of heat tolerance Co 99004”
Claim · model-written summary
Co 99004 had less lipid peroxidation and membrane injury.
Verbatim
e0“lower level of lipid peroxidation and membrane injury index”
e1“heat-sensitive varieties, sugarcane genotype that possessed higher degrees of heat tolerance Co 99004”
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- negative
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.