Abstract
Genetic variability is a pre-requisite for establishment of any breeding programme. Hundred and thirty six (136) cowpea genotypes were grown under drought-stress and non-stress conditions at Chokwe Research Station, Mozambique, from June to October 2008, to assess their variability in drought tolerance. Drought stress was applied from flowering to physiological maturity on stress treatment plants. On the other hand, non-stressed treatment plants, were watered regularly throughout the experiment. Data were recorded on yield and yield components (number of pods per plant, number of seeds per pod and 100-seed weight) at physiological maturity. Quantitative indices of stress tolerance were calculated from yield data (tolerance index, mean productivity, geometric mean productivity, stress intensity, stress susceptibility index and stress tolerance index). Data analysis was performed using the Mixed Model Residual Maximum likelihood (REML), correlations and multivariate analysis conducted on stressed and non-stressed yield. Drought stress reduced yields, but genotypes responded differently to the stress imposed indicating variability in drought tolerance. Biplot displays of quantitative indices of stress tolerance and yield showed that genotypes were distributed over the coordinate space indicating variability in yield and drought tolerance amongst the tested germplasm. Genotypes were grouped into four categories; (i) high yielding-drought tolerant, (ii) high yielding-drought susceptible, (iii) low yielding-drought tolerant, and (iv) low yielding-drought susceptible. This genetic variability in drought stress provides scope for cowpea genetic improvement.
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Claims 6
Claim · model-written summary
Drought stress reduced cowpea yields.
- Taxon
- cowpea
Vigna unguiculatae1 - Treatment
- Drought stresse0
- Outcome
- yieldse0
- Direction
- reducede0
- Comparator
- non-stress conditionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress reduced yields”
e1“cowpea genotypes were grown under drought-stress and non-stress conditions”
Claim · model-written summary
Cowpea genotypes differed in their drought stress response.
- Taxon
- cowpeaVigna unguiculatae1
- Material
- genotypese0
- Outcome
- drought tolerancee0
- Direction
- variabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypes responded differently to the stress imposed indicating variability in drought tolerance.”
e1“cowpea genotypes”
Claim · model-written summary
Biplots showed variability in yield among tested cowpea germplasm.
- Taxon
- cowpeaVigna unguiculatae1
- Material
- tested germplasme0
- Outcome
- yielde0
- Direction
- variabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biplot displays of quantitative indices of stress tolerance and yield showed that genotypes were distributed over the coordinate space indicating variability in yield and drought tolerance amongst the tested germplasm.”
e1“cowpea genotypes”
Claim · model-written summary
Biplots showed variability in drought tolerance among tested cowpea germplasm.
- Taxon
- cowpeaVigna unguiculatae1
- Material
- tested germplasme0
- Outcome
- drought tolerancee0
- Direction
- variabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biplot displays of quantitative indices of stress tolerance and yield showed that genotypes were distributed over the coordinate space indicating variability in yield and drought tolerance amongst the tested germplasm.”
e1“cowpea genotypes”
Claim · model-written summary
Cowpea genotypes were classified into four yield and drought tolerance categories.
- Taxon
- cowpeaVigna unguiculatae1
- Outcome
- grouped into four categoriese0
- Value
- foure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes were grouped into four categories; (i) high yielding-drought tolerant, (ii) high yielding-drought susceptible, (iii) low yielding-drought tolerant, and (iv) low yielding-drought susceptible.”
e1“cowpea genotypes”
Claim · model-written summary
The authors conclude that drought tolerance variability offers scope for cowpea genetic improvement.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- cowpea genetic improvemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This genetic variability in drought stress provides scope for cowpea genetic improvement.”
The same questions in other papers
drought · yield · Vigna unguiculata (cowpea)Results differ
38 papers in the same direction as this paper · 7 in the opposite direction
- no effect
- positive
- positive
42 papers more in this group
See all 46 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.