Abstract
Abstract Worldwide rice productivity is being threatened by increased endeavours of drought stress. Among the visible symptoms of drought stress, hampered water relations and disrupted cellular membrane functions are the most important. Exogenous use of polyamines (PAs), salicylic acid (SA), brassinosteroids (BRs), glycinebetaine (GB) and nitrous oxide (NO) can induce abiotic stresses tolerance in many crops. In this time course study, we appraised the comparative role of all these substances to improve the drought tolerance in rice ( Oryza sativa L.) cultivar Super‐Basmati. Plants were subjected to drought stress at four leaf stage (4 weeks after emergence) by maintaining soil moisture at 50 % of field capacity. Pre‐optimized concentrations of GB (150 mg l −1 ), SA (100 mg l −1 ), NO (100 μmol l −1 sodium nitroprusside as NO donor), BR (0.01 μ m 24‐epibrassinolide) and spermine (Spm; 10 μ m ) were foliar sprayed at five‐leaf stage (5 weeks after emergence). There were two controls both receiving no foliar spray, viz. well watered (CK1) and drought stressed (CK2). There was substantial reduction in allometric response of rice, gas exchange and water relation attributes by drought stress. While drought stress enhanced the H 2 O 2 , malondialdehyde (MDA) and relative membrane permeability, foliar spray of all the chemicals improved growth possibly because of the improved carbon assimilation, enhanced synthesis of metabolites and maintenance of tissue water status. Simultaneous reduction in H 2 O 2 and MDA production was also noted in the plants treated with these substances. Drought tolerance was sturdily associated with the greater tissue water potential, increased synthesis of metabolites and enhanced capacity of antioxidant system. Of all the chemicals, foliar spray with Spm was the most effective followed by BR.
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Claims 6
Claim · model-written summary
Drought stress substantially reduced the allometric response, gas exchange and water relation attributes of rice.
- Taxon
- rice
Oryza sativae1 - Treatment
- drought stresse1
- Outcome
- allometric response of rice, gas exchange and water relation attributese1
- Direction
- reductione1
- Comparator
- well waterede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“There was substantial reduction in allometric response of rice, gas exchange and water relation attributes by drought stress”
e2“well watered (CK1)”
Claim · model-written summary
Drought stress enhanced H2O2, malondialdehyde and relative membrane permeability in rice.
- Taxon
- RiceOryza sativat0
- Treatment
- drought stresse1
- Outcome
- H 2 O 2 , malondialdehyde (MDA) and relative membrane permeabilitye1
- Direction
- enhancede1
- Comparator
- well waterede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought Resistance of Rice”
e1“While drought stress enhanced the H 2 O 2 , malondialdehyde (MDA) and relative membrane permeability”
e2“well watered (CK1)”
Claim · model-written summary
Foliar spray of all the chemicals improved growth of drought-stressed rice.
- Taxon
- RiceOryza sativat0
- Treatment
- foliar spray of all the chemicalse1
- Outcome
- growthe1
- Direction
- improvede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought Resistance of Rice”
e1“foliar spray of all the chemicals improved growth”
Claim · model-written summary
Plants treated with these substances showed reduced H2O2 and MDA production.
- Taxon
- RiceOryza sativat0
- Treatment
- these substancese1
- Outcome
- H 2 O 2 and MDA productione1
- Direction
- reductione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought Resistance of Rice”
e1“Simultaneous reduction in H 2 O 2 and MDA production was also noted in the plants treated with these substances”
Claim · model-written summary
Drought tolerance of rice was strongly associated with greater tissue water potential, increased synthesis of metabolites and enhanced antioxidant capacity.
- Taxon
- RiceOryza sativat0
- Compound
- metabolitese1
- Outcome
- Drought tolerancee1
- Qualifier
- greater tissue water potential, increased synthesis of metabolites and enhanced capacity of antioxidant systeme1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought Resistance of Rice”
e1“Drought tolerance was sturdily associated with the greater tissue water potential, increased synthesis of metabolites and enhanced capacity of antioxidant system”
Claim · model-written summary
Of all the chemicals, foliar spray with spermine was the most effective, followed by brassinosteroids.
- Taxon
- RiceOryza sativat0
- Treatment
- foliar spray with Spme1
- Outcome
- the most effectivee1
- Direction
- the most effectivee1
- Comparator
- all the chemicalse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Drought Resistance of Rice”
e1“Of all the chemicals, foliar spray with Spm was the most effective followed by BR”
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See all 313 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.