Abstract
• The aim of this study was to determine whether guaiacol peroxidase (POX), superoxide dismutase (SOD) and catalase (CAT) activities are effective in the protection and recovery of cowpea (Vigna unguiculata (L.) Walp.) leaves exposed to a salt-induced oxidative stress. The salt treatment (200 mm NaCl) was imposed during six consecutive days and the salt withdrawal after 3 d (recovery treatment). Control plants received no NaCl treatment. • The salt treatment caused almost complete cessation of leaf relative growth rate in parallel with the transpiration rate. The restriction in leaf growth was associated with a progressive increase in membrane damage, lipid peroxidation and proline content. Salt withdrawal induced a significant recovery in both leaf growth rate and transpiration. Surprisingly, these prestressed/recovered plants showed only a slight recovery in leaf lipid peroxidation and membrane damage. • Leaf CAT activity experienced a twofold decrease only after 1 d NaCl treatment, and salt withdrawal had no effect on its recovery. SOD activity did not change compared with control plants. By contrast, POX activity significantly increased after 1 d NaCl treatment and showed a significant recovery to levels near to those of control. • In conclusion, it appears that the ability of cowpea plants to survive under high levels of salinity is not caused by an operating antioxidant system involving SOD, POX and CAT activities in mature leaves.
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Claims 10
Claim · model-written summary
The 200 mM NaCl treatment caused almost complete cessation of leaf relative growth rate in cowpea, in parallel with transpiration rate, relative to control plants.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- 200 mm NaCle2
- Outcome
- leaf relative growth ratee1
- Direction
- cessatione1
- Qualifier
- in parallel with the transpiration ratee1
- Comparator
- Control plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea (Vigna unguiculata (L.) Walp.) leaves”
e2“The salt treatment (200 mm NaCl) was imposed during six consecutive days”
e3“Control plants received no NaCl treatment”
e1“The salt treatment caused almost complete cessation of leaf relative growth rate in parallel with the transpiration rate”
Claim · model-written summary
Salt stress increased membrane damage, lipid peroxidation and proline content in cowpea leaves relative to control plants.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- 200 mm NaCle1
- Outcome
- membrane damage, lipid peroxidation and proline contente2
- Direction
- increasee2
- Comparator
- Control plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea (Vigna unguiculata (L.) Walp.) leaves”
e1“The salt treatment (200 mm NaCl) was imposed during six consecutive days”
e3“Control plants received no NaCl treatment”
e2“The restriction in leaf growth was associated with a progressive increase in membrane damage, lipid peroxidation and proline content”
Claim · model-written summary
Salt withdrawal significantly recovered leaf growth rate and transpiration in cowpea.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- Salt withdrawale3
- Outcome
- leaf growth rate and transpiratione3
- Direction
- recoverye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea (Vigna unguiculata (L.) Walp.) leaves”
e3“Salt withdrawal induced a significant recovery in both leaf growth rate and transpiration”
Claim · model-written summary
Recovered cowpea plants showed only a slight recovery in leaf lipid peroxidation and membrane damage.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- Salt withdrawale3
- Outcome
- leaf lipid peroxidation and membrane damagee4
- Direction
- only a slight recoverye4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea (Vigna unguiculata (L.) Walp.) leaves”
e3“Salt withdrawal induced a significant recovery in both leaf growth rate and transpiration”
e4“these prestressed/recovered plants showed only a slight recovery in leaf lipid peroxidation and membrane damage”
Claim · model-written summary
Leaf CAT activity of cowpea decreased twofold only after 1 d of NaCl treatment.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- 1 d NaCl treatmente5
- Outcome
- Leaf CAT activitye5
- Direction
- decreasee5
- Value
- twofolde5
- Qualifier
- only after 1 de5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea (Vigna unguiculata (L.) Walp.) leaves”
e5“Leaf CAT activity experienced a twofold decrease only after 1 d NaCl treatment”
Claim · model-written summary
Salt withdrawal had no effect on the recovery of cowpea leaf CAT activity.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- salt withdrawale6
- Gene
- CATe5
- Outcome
- recoverye6
- Direction
- had no effecte6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea (Vigna unguiculata (L.) Walp.) leaves”
e5“Leaf CAT activity experienced a twofold decrease only after 1 d NaCl treatment”
e6“salt withdrawal had no effect on its recovery”
Claim · model-written summary
SOD activity of cowpea leaves did not change compared with control plants under salt treatment.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- salt treatmente6
- Gene
- SODe7
- Outcome
- SOD activitye7
- Direction
- did not changee7
- Comparator
- control plantse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea (Vigna unguiculata (L.) Walp.) leaves”
e6“The salt treatment (200 mm NaCl) was imposed during six consecutive days”
e7“SOD activity did not change compared with control plants”
Claim · model-written summary
POX activity of cowpea leaves significantly increased after 1 d of NaCl treatment.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- 1 d NaCl treatmente4
- Gene
- POXe4
- Outcome
- POX activitye4
- Direction
- significantly increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea (Vigna unguiculata (L.) Walp.) leaves”
e4“POX activity significantly increased after 1 d NaCl treatment”
Claim · model-written summary
POX activity of cowpea leaves significantly recovered to levels near those of control after salt withdrawal.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- 1 d NaCl treatmente4
- Gene
- POXe4
- Outcome
- recoverye5
- Direction
- recoverye5
- Comparator
- controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea (Vigna unguiculata (L.) Walp.) leaves”
e4“POX activity significantly increased after 1 d NaCl treatment”
e5“showed a significant recovery to levels near to those of control”
Claim · model-written summary
The ability of cowpea to survive high salinity is not caused by an operating antioxidant system involving SOD, POX and CAT in mature leaves.
- Taxon
- cowpeaVigna unguiculatae1
- Gene
- SOD, POX and CATe1
- Outcome
- ability of cowpea plants to survive under high levels of salinitye1
- Qualifier
- not caused by an operating antioxidant systeme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the ability of cowpea plants to survive under high levels of salinity is not caused by an operating antioxidant system involving SOD, POX and CAT activities in mature leaves”
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