Abstract
High temperature is an important environmental stress that influences the growth and development of crop plants thus adversely affecting their production and productivity. An experiment was carried out to investigate the protective role of bioregulators viz., Putrescine (Put), Thiourea (TU) and Hydrogen Peroxide (H2O2) against high temperature stress in maize at early vegetative stage. Maize genotypes earlier identified as heat tolerant (NSJ 221 and NSJ 189) and heat sensitive (RJR 270 and PSRJ 13099) were chosen for the present study. Independent foliar spray of Put (4 mM), TU (20mM) and H2O2 (1.2 mM) was observed to have significant difference (P>0.01) between genotypes, treatments and their interaction when applied 72 hrs prior to heat exposure. High temperature stress led to disruption of cellular membrane by increasing cell membrane injury, lipid peroxidation and H2O2 contents. It led to decrease in total chlorophyll content, soluble proteins, quantum yield and POD activity. Increased SOD activity in heat stressed seedlings was recorded with genotypes NSJ 189 and NSJ 221. Foliar application of Put, TU and H2O2 ameliorated heat-induced damages by stimulating the antioxidant enzyme system through decrease in lipid peroxidation, membrane injury and H2O2 contents in all the genotypes when compared with untreated heat stressed seedlings. Spray with these chemicals resulted in an increase in chlorophyll content, quantum yield and activities of anti-oxidative stress enzymes. Genotypes RJR 270 and PSRJ 13099 recorded improved heat tolerance with spray either of these chemicals by enhancing their biochemical potential. Spray of Put or TU was observed to be more effective of improving heat stress tolerance of maize seedlings.
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Claims 9
Claim · model-written summary
Heat stress increased cell membrane injury, lipid peroxidation and H2O2 contents in maize seedlings.
- Treatment
- High temperature stresse0
- Outcome
- cell membrane injury, lipid peroxidation and H2O2 contentse0
- Direction
- increasinge0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature stress led to disruption of cellular membrane by increasing cell membrane injury, lipid peroxidation and H2O2 contents.”
t0“Maize”
Claim · model-written summary
Heat stress decreased total chlorophyll content, soluble proteins, quantum yield and POD activity in maize seedlings.
- Outcome
- total chlorophyll content, soluble proteins, quantum yield and POD activitye0
- Direction
- decreasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It led to decrease in total chlorophyll content, soluble proteins, quantum yield and POD activity.”
t0“Maize”
Claim · model-written summary
Heat-stressed NSJ 189 and NSJ 221 seedlings showed increased SOD activity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased SOD activity in heat stressed seedlings was recorded with genotypes NSJ 189 and NSJ 221.”
t0“Maize”
Claim · model-written summary
Put foliar spray reduced lipid peroxidation, membrane injury and H2O2 contents relative to untreated heat-stressed maize seedlings.
- Treatment
- Pute0
- Outcome
- lipid peroxidation, membrane injury and H2O2 contentse0
- Direction
- decreasee0
- Comparator
- untreated heat stressed seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of Put, TU and H2O2 ameliorated heat-induced damages by stimulating the antioxidant enzyme system through decrease in lipid peroxidation, membrane injury and H2O2 contents in all the genotypes when compared with untreated heat stressed seedlings.”
t0“Maize”
Claim · model-written summary
TU foliar spray reduced lipid peroxidation, membrane injury and H2O2 contents relative to untreated heat-stressed maize seedlings.
- Treatment
- TUe0
- Outcome
- lipid peroxidation, membrane injury and H2O2 contentse0
- Direction
- decreasee0
- Comparator
- untreated heat stressed seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of Put, TU and H2O2 ameliorated heat-induced damages by stimulating the antioxidant enzyme system through decrease in lipid peroxidation, membrane injury and H2O2 contents in all the genotypes when compared with untreated heat stressed seedlings.”
t0“Maize”
Claim · model-written summary
H2O2 foliar spray reduced lipid peroxidation, membrane injury and H2O2 contents relative to untreated heat-stressed maize seedlings.
- Treatment
- H2O2e0
- Outcome
- lipid peroxidation, membrane injury and H2O2 contentse0
- Direction
- decreasee0
- Comparator
- untreated heat stressed seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of Put, TU and H2O2 ameliorated heat-induced damages by stimulating the antioxidant enzyme system through decrease in lipid peroxidation, membrane injury and H2O2 contents in all the genotypes when compared with untreated heat stressed seedlings.”
t0“Maize”
Claim · model-written summary
Chemical sprays increased chlorophyll content, quantum yield and antioxidant enzyme activities.
- Treatment
- these chemicalse0
- Outcome
- chlorophyll content, quantum yield and activities of anti-oxidative stress enzymese0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spray with these chemicals resulted in an increase in chlorophyll content, quantum yield and activities of anti-oxidative stress enzymes.”
t0“Maize”
Claim · model-written summary
RJR 270 and PSRJ 13099 showed improved heat tolerance after chemical spray.
- Material
- RJR 270 and PSRJ 13099e0
- Treatment
- spray either of these chemicalse0
- Outcome
- heat tolerancee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes RJR 270 and PSRJ 13099 recorded improved heat tolerance with spray either of these chemicals by enhancing their biochemical potential.”
t0“Maize”
Claim · model-written summary
Put or TU spray was more effective at improving maize seedling heat tolerance.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spray of Put or TU was observed to be more effective of improving heat stress tolerance of maize seedlings.”
The same questions in other papers
hydrogen peroxide · physiology: oxidative · Zea mays (maize)Results differ
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- negative
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1 paper in the same direction as this paper · 2 in the opposite direction
- negative
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thiourea · physiology: oxidative · Zea mays (maize)Positive and negative results
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- no effect
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See all 23 papers →application · tolerance: abiotic · Zea mays (maize)Results agree
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See all 8 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.