Abstract
Abstract Mid‐season drought is a factor frequently limiting crop production in the moist to dry savannah zones of the tropical and subtropical regions of the world. Ten cowpea genotypes were subjected to a cycle of drought at flowering followed by re‐watering to study variation in drought performance and recovery. Drought caused a reduction in leaf assimilation rate, transpiration rate and stomatal conductance with genotypic variances of 75.4, 57.9, and 83.3 %, respectively. Only genotypic variance in stomatal conductance increased appreciably under drought. Reductions in leaf water potential as a consequence of drought positively correlated with a decline in assimilation rate, which was associated with stomatal closure. One week after re‐watering, the three gas exchange parameters of stressed plants recovered fully and attained values 10–30 % higher than the well‐watered plants with increased genotypic variability. Reductions in the total dry matter during the drought interval varied from 11 to 50 % among genotypes, but were of minor importance for the total dry matter at maturity. After stress, the gain in dry matter varied considerably among the stressed genotypes, with stressed plants showing higher gain than the unstressed plants during this interval. This was associated with increased availability of assimilates due to enhanced green leaf area duration after stress release. Variability in drought recovery among genotypes was found, and appears to be more important for final yield than responses during drought.
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Claims 13
Claim · model-written summary
Drought reduced leaf assimilation rate in cowpea, with genotypic variance 75.4.
- Taxon
- Cowpea
Vigna unguiculatat0 - Treatment
- Droughte0
- Outcome
- leaf assimilation ratee0
- Direction
- reductione0
- Value
- 75.4e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought caused a reduction in leaf assimilation rate, transpiration rate and stomatal conductance with genotypic variances of 75.4, 57.9, and 83.3 %, respectively.”
t0“Cowpea”
Claim · model-written summary
Drought reduced transpiration rate in cowpea, with genotypic variance 57.9.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- Droughte0
- Outcome
- transpiration ratee0
- Direction
- reductione0
- Value
- 57.9e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought caused a reduction in leaf assimilation rate, transpiration rate and stomatal conductance with genotypic variances of 75.4, 57.9, and 83.3 %, respectively.”
t0“Cowpea”
Claim · model-written summary
Drought reduced stomatal conductance in cowpea, with genotypic variance 83.3 %.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- Droughte0
- Outcome
- stomatal conductancee0
- Direction
- reductione0
- Value
- 83.3 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought caused a reduction in leaf assimilation rate, transpiration rate and stomatal conductance with genotypic variances of 75.4, 57.9, and 83.3 %, respectively.”
t0“Cowpea”
Claim · model-written summary
Genotypic variance in stomatal conductance increased under drought.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- droughte0
- Outcome
- genotypic variance in stomatal conductancee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only genotypic variance in stomatal conductance increased appreciably under drought.”
t0“Cowpea”
Claim · model-written summary
Drought-induced reductions in leaf water potential correlated positively with declining assimilation rate.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- droughte0
- Outcome
- assimilation ratee0
- Direction
- declinee0
- Qualifier
- Reductions in leaf water potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reductions in leaf water potential as a consequence of drought positively correlated with a decline in assimilation rate”
t0“Cowpea”
Claim · model-written summary
The assimilation decline was associated with stomatal closure.
- Taxon
- CowpeaVigna unguiculatat0
- Organ / stage
- stomatale0
- Outcome
- assimilation ratee0
- Direction
- declinee0
- Qualifier
- stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a decline in assimilation rate, which was associated with stomatal closure”
t0“Cowpea”
Claim · model-written summary
Gas exchange parameters recovered fully one week after re-watering.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- re‐wateringe0
- Outcome
- three gas exchange parameterse0
- Direction
- highere0
- Value
- 10–30 %e0
- Qualifier
- One week after re‐wateringe0
- Comparator
- well‐watered plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One week after re‐watering, the three gas exchange parameters of stressed plants recovered fully and attained values 10–30 % higher than the well‐watered plants with increased genotypic variability.”
t0“Cowpea”
Claim · model-written summary
Genotypic variability increased after re-watering.
- Taxon
- CowpeaVigna unguiculatat0
- Outcome
- genotypic variabilitye0
- Direction
- increasede0
- Comparator
- well‐watered plantse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the three gas exchange parameters of stressed plants recovered fully and attained values 10–30 % higher than the well‐watered plants with increased genotypic variability”
t0“Cowpea”
Claim · model-written summary
Drought reduced total dry matter by 11 to 50% across genotypes.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- droughte0
- Outcome
- total dry mattere0
- Direction
- Reductionse0
- Value
- 11 to 50 %e0
- Qualifier
- among genotypese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reductions in the total dry matter during the drought interval varied from 11 to 50 % among genotypes, but were of minor importance for the total dry matter at maturity.”
t0“Cowpea”
Claim · model-written summary
Dry-matter reductions during drought had minor importance for mature dry matter.
- Taxon
- CowpeaVigna unguiculatat0
- Outcome
- total dry matter at maturitye0
- Qualifier
- minor importancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were of minor importance for the total dry matter at maturity”
t0“Cowpea”
Claim · model-written summary
Stressed plants gained more dry matter than unstressed plants after stress.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- stressed plantse0
- Outcome
- gain in dry mattere0
- Direction
- highere0
- Comparator
- unstressed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After stress, the gain in dry matter varied considerably among the stressed genotypes, with stressed plants showing higher gain than the unstressed plants during this interval.”
t0“Cowpea”
Claim · model-written summary
Enhanced green leaf area duration after stress release was associated with greater assimilate availability.
- Taxon
- CowpeaVigna unguiculatat0
- Organ / stage
- green leafe0
- Outcome
- availability of assimilatese0
- Direction
- increasede0
- Qualifier
- enhanced green leaf area duration after stress releasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was associated with increased availability of assimilates due to enhanced green leaf area duration after stress release.”
t0“Cowpea”
Claim · model-written summary
Drought recovery varied among genotypes and appeared more important for final yield than drought responses.
- Taxon
- CowpeaVigna unguiculatat0
- Outcome
- Variability in drought recoverye0
- Qualifier
- more important for final yield than responses during droughte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Variability in drought recovery among genotypes was found, and appears to be more important for final yield than responses during drought.”
t0“Cowpea”
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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.