Abstract
Abstract Cowpea is widely cultivated in arid and semi‐arid regions of the world where salinity is a major environmental stress that limits crop productivity. The effects of moderate salinity on growth and photosynthesis were examined during the vegetative phase of two cowpea cultivars previously classified as salt‐tolerant (Pitiúba) and salt‐sensitive (TVu). Two salt treatments (0 and 75 m m NaCl) were applied to 10‐day‐old plants grown in nutrient solution for 24 days. Salt stress caused decreases (59 % in Pitiúba and 72 % in TVu) in biomass accumulation at the end of the experiment. Photosynthetic rates per unit leaf mass, but not per unit leaf area, were remarkably impaired, particularly in TVu. This response was unlikely to have resulted from stomatal or photochemical constraints. Differences in salt tolerance between cultivars were unrelated to (i) variant patterns of Cl − and K + tissue concentration, (ii) contrasting leaf water relations, or (iii) changes in relative growth rate and net assimilation rate. The relative advantage of Pitiúba over TVu under salt stress was primarily associated with (i) restricted Na + accumulation in leaves paralleling an absolute increase in Na + concentration in roots at early stages of salt treatment and (ii) improved leaf area (resulting from a larger leaf area ratio coupled with a larger leaf mass fraction and larger specific leaf area) and photosynthetic rates per unit leaf mass. Overall, these responses would allow greater whole‐plant carbon gain, thus contributing to a better agronomic performance of salt‐tolerant cowpea cultivars in salinity‐prone regions.
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Claims 5
Claim · model-written summary
Salt stress decreased biomass accumulation in cowpea cultivars, by 59% in Pitiúba and 72% in TVu.
- Taxon
- Cowpea
Vigna unguiculatat0 - Material
- Pitiúbae0
- Treatment
- Salt stresse0
- Outcome
- biomass accumulatione0
- Direction
- decreasese0
- Value
- 59 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Salt Tolerance is Associated with Differences in Ion Accumulation, Biomass Allocation and Photosynthesis in Cowpea Cultivars”
e0“Salt stress caused decreases (59 % in Pitiúba and 72 % in TVu) in biomass accumulation at the end of the experiment”
Claim · model-written summary
Photosynthetic rates per unit leaf mass were remarkably impaired by salt stress, particularly in TVu, while rates per unit leaf area were not.
- Taxon
- CowpeaVigna unguiculatat0
- Material
- TVue1
- Treatment
- Salt stresse0
- Outcome
- Photosynthetic rates per unit leaf masse1
- Direction
- remarkably impairede1
- Qualifier
- but not per unit leaf areae1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Salt Tolerance is Associated with Differences in Ion Accumulation, Biomass Allocation and Photosynthesis in Cowpea Cultivars”
e0“Salt stress caused decreases (59 % in Pitiúba and 72 % in TVu) in biomass accumulation at the end of the experiment”
e1“Photosynthetic rates per unit leaf mass, but not per unit leaf area, were remarkably impaired, particularly in TVu”
Claim · model-written summary
Differences in salt tolerance between cultivars were unrelated to the tissue concentrations of Cl- and K+, leaf water relations and growth rate indices.
- Taxon
- CowpeaVigna unguiculatat0
- Material
- cultivarse2
- Outcome
- salt tolerancee2
- Direction
- unrelated toe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Salt Tolerance is Associated with Differences in Ion Accumulation, Biomass Allocation and Photosynthesis in Cowpea Cultivars”
e2“Differences in salt tolerance between cultivars were unrelated to”
Claim · model-written summary
Restricted leaf Na+ accumulation was associated with salt tolerance of cowpea cultivars.
- Taxon
- CowpeaVigna unguiculatat0
- Organ / stage
- leavese3
- Treatment
- salt treatmente3
- Compound
- Na +e3
- Outcome
- accumulation in leavese3
- Direction
- restrictede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Salt Tolerance is Associated with Differences in Ion Accumulation, Biomass Allocation and Photosynthesis in Cowpea Cultivars”
e3“restricted Na + accumulation in leaves paralleling an absolute increase in Na + concentration in roots at early stages of salt treatment”
Claim · model-written summary
Improved leaf area and photosynthetic rates per unit leaf mass were associated with salt tolerance of cowpea cultivars.
- Taxon
- CowpeaVigna unguiculatat0
- Organ / stage
- leafe4
- Outcome
- leaf areae4
- Direction
- improvede4
- Qualifier
- resulting from a larger leaf area ratioe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Salt Tolerance is Associated with Differences in Ion Accumulation, Biomass Allocation and Photosynthesis in Cowpea Cultivars”
e4“improved leaf area (resulting from a larger leaf area ratio coupled with a larger leaf mass fraction and larger specific leaf area)”
e1“Photosynthetic rates per unit leaf mass, but not per unit leaf area, were remarkably impaired, particularly in TVu”
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See all 10 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.