Abstract
Abstract The application of a moderate water deficit (water potential of −1.3 MPa) to pea (Pisum sativum L. cv Lincoln) leaves led to a 75% inhibition of photosynthesis and to increases in zeaxanthin, malondialdehyde, oxidized proteins, and mitochondrial, cytosolic, and chloroplastic superoxide dismutase activities. Severe water deficit (−1.9 MPa) almost completely inhibited photosynthesis, decreased chlorophylls, β-carotene, neoxanthin, and lutein, and caused further conversion of violaxanthin to zeaxanthin, suggesting damage to the photosynthetic apparatus. There were consistent decreases in antioxidants and pyridine nucleotides, and accumulation of catalytic Fe, malondialdehyde, and oxidized proteins. Paraquat (PQ) treatment led to similar major decreases in photosynthesis, water content, proteins, and most antioxidants, and induced the accumulation of zeaxanthin and damaged proteins. PQ decreased markedly ascorbate, NADPH, ascorbate peroxidase, and chloroplastic Fe-superoxide dismutase activity, and caused major increases in oxidized glutathione, NAD+, NADH, and catalytic Fe. It is concluded that, in cv Lincoln, the increase in catalytic Fe and the lowering of antioxidant protection may be involved in the oxidative damage caused by severe water deficit and PQ, but not necessarily in the incipient stress induced by moderate water deficit. Results also indicate that the tolerance to water deficit in terms of oxidative damage largely depends on the legume cultivar.
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Claims 13
Claim · model-written summary
Moderate water deficit inhibited pea leaf photosynthesis by 75%.
- Taxon
- pea
Lathyrus oleraceuse0 - Material
- cv Lincolne0
- Organ / stage
- leavese0
- Treatment
- moderate water deficit (water potential of −1.3 MPa)e0
- Outcome
- photosynthesise0
- Direction
- inhibitione0
- Value
- 75%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of a moderate water deficit (water potential of −1.3 MPa) to pea (Pisum sativum L. cv Lincoln) leaves led to a 75% inhibition of photosynthesis”
Claim · model-written summary
Moderate water deficit increased zeaxanthin, malondialdehyde, oxidized proteins and superoxide dismutase activities.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- moderate water deficite2
- Outcome
- zeaxanthin, malondialdehyde, oxidized proteins, and mitochondrial, cytosolic, and chloroplastic superoxide dismutase activitiese0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in zeaxanthin, malondialdehyde, oxidized proteins, and mitochondrial, cytosolic, and chloroplastic superoxide dismutase activities”
e2“application of a moderate water deficit”
t0“Pea Plants”
Claim · model-written summary
Severe water deficit almost completely inhibited photosynthesis.
- Taxon
- Pea PlantsLathyrus oleraceust0
- Treatment
- Severe water deficit (−1.9 MPa)e0
- Outcome
- photosynthesise0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe water deficit (−1.9 MPa) almost completely inhibited photosynthesis”
t0“Pea Plants”
Claim · model-written summary
Severe water deficit decreased chlorophylls and three carotenoids.
- Taxon
- Pea PlantsLathyrus oleraceust0
- Treatment
- Severe water deficite2
- Outcome
- chlorophylls, β-carotene, neoxanthin, and luteine0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased chlorophylls, β-carotene, neoxanthin, and lutein”
e2“Severe water deficit”
t0“Pea Plants”
Claim · model-written summary
Severe water deficit further converted violaxanthin to zeaxanthin.
- Taxon
- Pea PlantsLathyrus oleraceust0
- Treatment
- Severe water deficite2
- Outcome
- conversion of violaxanthin to zeaxanthine0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“caused further conversion of violaxanthin to zeaxanthin”
e2“Severe water deficit”
t0“Pea Plants”
Claim · model-written summary
Antioxidants and pyridine nucleotides decreased under the reported stress.
- Taxon
- Pea PlantsLathyrus oleraceust0
- Outcome
- antioxidants and pyridine nucleotidese0
- Direction
- decreasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were consistent decreases in antioxidants and pyridine nucleotides”
t0“Pea Plants”
Claim · model-written summary
Catalytic Fe, malondialdehyde and oxidized proteins accumulated.
- Taxon
- Pea PlantsLathyrus oleraceust0
- Outcome
- catalytic Fe, malondialdehyde, and oxidized proteinse0
- Direction
- accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accumulation of catalytic Fe, malondialdehyde, and oxidized proteins”
t0“Pea Plants”
Claim · model-written summary
Paraquat reduced photosynthesis, water content, proteins and most antioxidants.
- Taxon
- Pea PlantsLathyrus oleraceust0
- Treatment
- Paraquat (PQ) treatmente0
- Outcome
- photosynthesis, water content, proteins, and most antioxidantse0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Paraquat (PQ) treatment led to similar major decreases in photosynthesis, water content, proteins, and most antioxidants”
t0“Pea Plants”
Claim · model-written summary
Paraquat induced accumulation of zeaxanthin and damaged proteins.
- Taxon
- Pea PlantsLathyrus oleraceust0
- Treatment
- PQe2
- Outcome
- zeaxanthin and damaged proteinse0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“induced the accumulation of zeaxanthin and damaged proteins”
e2“Paraquat (PQ) treatment”
t0“Pea Plants”
Claim · model-written summary
Paraquat decreased ascorbate, NADPH, ascorbate peroxidase and chloroplastic Fe-superoxide dismutase activity.
- Taxon
- Pea PlantsLathyrus oleraceust0
- Treatment
- PQe0
- Outcome
- ascorbate, NADPH, ascorbate peroxidase, and chloroplastic Fe-superoxide dismutase activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PQ decreased markedly ascorbate, NADPH, ascorbate peroxidase, and chloroplastic Fe-superoxide dismutase activity”
t0“Pea Plants”
Claim · model-written summary
Paraquat increased oxidized glutathione, NAD+, NADH and catalytic Fe.
- Taxon
- Pea PlantsLathyrus oleraceust0
- Treatment
- PQe2
- Outcome
- oxidized glutathione, NAD+, NADH, and catalytic Fee0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“caused major increases in oxidized glutathione, NAD+, NADH, and catalytic Fe”
e2“Paraquat (PQ) treatment”
t0“Pea Plants”
Claim · model-written summary
The authors attribute severe stress oxidative damage partly to catalytic Fe increase and reduced antioxidant protection.
- Taxon
- Pea PlantsLathyrus oleraceust0
- Outcome
- oxidative damagee0
- Qualifier
- increase in catalytic Fe and the lowering of antioxidant protectione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase in catalytic Fe and the lowering of antioxidant protection may be involved in the oxidative damage caused by severe water deficit and PQ”
t0“Pea Plants”
Claim · model-written summary
Water-deficit oxidative damage tolerance depends largely on legume cultivar.
- Taxon
- legumee0
- Material
- legume cultivare0
- Outcome
- tolerance to water deficit in terms of oxidative damagee0
Not reportedDirection
Verbatim
e0“tolerance to water deficit in terms of oxidative damage largely depends on the legume cultivar”
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See all 15 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.