Abstract
Cowpea is the main subsistence crop—protein source—for the Brazilian semi-arid region. The use of salt-stress-tolerant varieties can improve crop yields. We evaluated the effect of irrigation with brackish water on the growth, photosynthetic responses, production, and tolerance of fifteen traditional varieties of cowpea. The experiment was conducted in randomized blocks, in a 15 × 2 factorial scheme, composed of 15 traditional varieties of cowpea and two salinity levels of irrigation water (0.5 and 4.5 dS m−1), with five replicates. Plants were grown in pots containing 10 dm3 of soil for 80 days. The reduction in the photosynthetic rate of cowpea varieties occurs mainly due to the decrease in stomatal conductance caused by salt stress. Salt stress increased the electron transport rate and photochemical quenching of cowpea varieties, but stress-tolerant varieties increased the CO2 assimilation rate and instantaneous carboxylation efficiency. The Ceará, Costela de Vaca, Pingo de Ouro, Ovo de Peru, and Sempre Verde varieties are tolerant to salt stress. Salt stress decreases 26% of the production of tolerant varieties to salt stress and 54% of susceptible varieties. The present findings show the existence of variability for saline stress tolerance in traditional varieties of cowpea and that Ceará, Costela de Vaca, Pingo de Ouro, and Ovo de Peru varieties are more suitable for crops irrigated with saline water.
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Claims 8
Claim · model-written summary
Salt stress decreased stomatal conductance and thereby photosynthetic rate.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- salt stresse0
- Outcome
- photosynthetic ratee0
- Direction
- reductione0
- Qualifier
- decrease in stomatal conductancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in the photosynthetic rate of cowpea varieties occurs mainly due to the decrease in stomatal conductance caused by salt stress”
Claim · model-written summary
Salt stress increased electron transport rate and photochemical quenching.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- Salt stresse0
- Outcome
- electron transport rate and photochemical quenchinge0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress increased the electron transport rate and photochemical quenching of cowpea varieties”
Claim · model-written summary
Stress-tolerant cowpea varieties increased CO2 assimilation and instantaneous carboxylation efficiency.
- Taxon
- cowpeaVigna unguiculatae1
- Material
- stress-tolerant varietiese0
- Outcome
- CO2 assimilation rate and instantaneous carboxylation efficiencye0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stress-tolerant varieties increased the CO2 assimilation rate and instantaneous carboxylation efficiency”
e1“photosynthetic rate of cowpea varieties”
Claim · model-written summary
Five named cowpea varieties were salt tolerant.
- Taxon
- cowpeaVigna unguiculatae1
- Material
- Ceará, Costela de Vaca, Pingo de Ouro, Ovo de Peru, and Sempre Verdee0
- Outcome
- tolerant to salt stresse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Ceará, Costela de Vaca, Pingo de Ouro, Ovo de Peru, and Sempre Verde varieties are tolerant to salt stress”
e1“photosynthetic rate of cowpea varieties”
Claim · model-written summary
Salt stress reduced production of tolerant varieties by 26%.
- Taxon
- cowpeaVigna unguiculatae1
- Material
- tolerant varietiese0
- Treatment
- Salt stresse0
- Outcome
- production of tolerant varietiese0
- Direction
- decreasese0
- Value
- 26%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress decreases 26% of the production of tolerant varieties to salt stress and 54% of susceptible varieties”
e1“photosynthetic rate of cowpea varieties”
Claim · model-written summary
Salt stress reduced production of susceptible varieties by 54%.
- Taxon
- cowpeaVigna unguiculatae1
- Material
- susceptible varietiese0
- Treatment
- Salt stresse0
- Outcome
- productione0
- Direction
- decreasese0
- Value
- 54%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress decreases 26% of the production of tolerant varieties to salt stress and 54% of susceptible varieties”
e1“photosynthetic rate of cowpea varieties”
Claim · model-written summary
Traditional cowpea varieties vary in saline stress tolerance.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- variability for saline stress tolerancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variability for saline stress tolerance in traditional varieties of cowpea”
Claim · model-written summary
Four varieties are recommended for saline-water irrigation.
- Taxon
- cowpeaVigna unguiculatae1
- Material
- Ceará, Costela de Vaca, Pingo de Ouro, and Ovo de Perue0
- Outcome
- more suitable for crops irrigated with saline watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ceará, Costela de Vaca, Pingo de Ouro, and Ovo de Peru varieties are more suitable for crops irrigated with saline water”
e1“photosynthetic rate of cowpea varieties”
The same questions in other papers
salinity · yield · Vigna unguiculata (cowpea)Results differ
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- negative
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1 in the opposite direction
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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.