Abstract
The salt stress effect in root growth and antioxidative response were investigated in two cowpea cultivars which differ in salt tolerance in terms of plant growth and leaf oxidative response. Four-day-old seedlings (establishment stage) were exposed to 100 mM NaCl for two days. The roots of the two cultivars presented distinct response in terms of salt-induced changes in elongation and dry weight. Root dry weight was only decreased in Pérola (sensitive) cultivar while root elongation was mainly hampered in Pitiúba (tolerant). Root relative water content remained unchanged under salinity, but root Na+ content achieved toxic levels as revealed by the K+/Na+ ratio in both cultivars. Then, root growth inhibition might be due to ionic toxicity rather than by salt-induced water deficit. Although electrolyte leakage markedly increased mainly in the Pérola genotype, lipid peroxidation decreased similarly in both salt-stressed cultivars. APX and SOD activities were reduced by salinity in both cultivars reaching similar values despite the decrease in Pitiúba had been higher compared to respective controls. CAT decreased significantly in Pitiúba but did not change in Pérola, while POX increased in both cultivars. The salt-induced decrease in the CAT activity of Pitiúba root is, at principle, incompatible to allow a more effective oxidative protection. Our results support the idea that the activities of SOD, APX, CAT and POX and lipid peroxidation in cowpea seedling roots were not associated with differential salt tolerance as previously characterized in terms of growth rate and oxidative response in plant leaves.
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Claims 14
Claim · model-written summary
Salt decreased root dry weight only in the sensitive Pérola cultivar.
- Taxon
- cowpea
Vigna unguiculatat0 - Material
- Pérolae0
- Organ / stage
- Roote0
- Treatment
- salte1
- Outcome
- Root dry weighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root dry weight was only decreased in Pérola (sensitive) cultivar while root elongation was mainly hampered in Pitiúba (tolerant)”
t0“cowpea”
e1“The salt stress effect”
Claim · model-written summary
Salt mainly hampered root elongation in tolerant Pitiúba.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- Pitiúbae0
- Organ / stage
- roote0
- Treatment
- salte1
- Outcome
- root elongatione0
- Direction
- hamperede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root elongation was mainly hampered in Pitiúba (tolerant)”
t0“cowpea”
e1“The salt stress effect”
Claim · model-written summary
Root relative water content stayed unchanged under salinity.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- Roote0
- Treatment
- salinitye0
- Outcome
- Root relative water contente0
- Direction
- unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root relative water content remained unchanged under salinity”
t0“cowpea”
Claim · model-written summary
Root sodium content reached toxic levels in both cultivars under salt stress.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- roote0
- Outcome
- root Na+ contente0
- Direction
- achieved toxic levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root Na+ content achieved toxic levels as revealed by the K+/Na+ ratio in both cultivars”
t0“cowpea”
Claim · model-written summary
Root growth inhibition may reflect ionic toxicity rather than salt-induced water deficit.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- root growth inhibitione0
- Qualifier
- ionic toxicity rather than by salt-induced water deficite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth inhibition might be due to ionic toxicity rather than by salt-induced water deficit”
t0“cowpea”
Claim · model-written summary
Electrolyte leakage increased markedly, mainly in Pérola.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- Pérolae0
- Treatment
- salte1
- Outcome
- electrolyte leakagee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“electrolyte leakage markedly increased mainly in the Pérola genotype”
t0“cowpea”
e1“The salt stress effect”
Claim · model-written summary
Lipid peroxidation decreased similarly in both salt-stressed cultivars.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- salt-stressede0
- Outcome
- lipid peroxidatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lipid peroxidation decreased similarly in both salt-stressed cultivars”
t0“cowpea”
Claim · model-written summary
APX and SOD activities fell under salinity in both cultivars to similar values.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- salinitye0
- Outcome
- APX and SOD activitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“APX and SOD activities were reduced by salinity in both cultivars reaching similar values”
t0“cowpea”
Claim · model-written summary
The decline in APX and SOD activities was greater in Pitiúba than its controls.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- Pitiúbae0
- Outcome
- decreasee0
- Direction
- highere0
- Comparator
- respective controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease in Pitiúba had been higher compared to respective controls”
t0“cowpea”
Claim · model-written summary
CAT activity decreased significantly in Pitiúba.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CAT decreased significantly in Pitiúba”
t0“cowpea”
e1“The salt stress effect”
Claim · model-written summary
CAT activity did not change in Pérola.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CAT decreased significantly in Pitiúba but did not change in Pérola”
t0“cowpea”
e1“The salt stress effect”
Claim · model-written summary
POX activity increased in both cultivars.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- salte1
- Outcome
- POXe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“POX increased in both cultivars”
t0“cowpea”
e1“The salt stress effect”
Claim · model-written summary
The reduced CAT activity in Pitiúba roots appears incompatible with more effective oxidative protection.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- Pitiúbae0
- Outcome
- more effective oxidative protectione0
- Qualifier
- salt-induced decrease in the CAT activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The salt-induced decrease in the CAT activity of Pitiúba root is, at principle, incompatible to allow a more effective oxidative protection”
t0“cowpea”
Claim · model-written summary
Root antioxidant enzyme activities and lipid peroxidation were not associated with differential cowpea salt tolerance.
- Taxon
- cowpeaVigna unguiculatae0
- Organ / stage
- seedling rootse0
- Outcome
- differential salt tolerancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activities of SOD, APX, CAT and POX and lipid peroxidation in cowpea seedling roots were not associated with differential salt tolerance”
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