Abstract
Cowpea is the main food legume grown in Niger. Its low yield is mainly due to drought stress occurring at any stage of plant development. This study aims to (i) assess the intermittent and terminal water deficit effects on agro-physiological parameters and (ii) identify relevant traits useful in breeding programs to select high yielding and drought tolerant genotypes. Field and lysimeter experiments were conducted at ICRISAT Sahelian Centre in Niger. For lysimeter experiment, three water treatments were imposed: well-water (BI), intermittent water deficit (DH1) and terminal water deficit (DH2). The results showed significant negative effects of DH1 and DH2 on investigated parameters. Thus, the seed weight decreases up to 54% and 53% due to DH1 and DH2 respectively. These stress reduced transpiration efficiency (TE) by 15% and 13% respectively, and harvest index (HI) by 38% and 26% respectively. For the genotypic variation, the highest seed weight decrease was observed on Tiligré (85% and 78% under DH1 and DH2 respectively) while IT98K-1111-1 showed the lowest seed weight decrease (28% and 17% under DH1 and DH2 respectively). Our results showed that yield variation is mainly explained by the number of matured pods, TE and HI. IT98K-1111-1 and IT96D-610 with highest TE and HI revealed drought tolerant whereas high transpiration was observed in drought sensitive genotypes. The field trial confirmed agronomical trend observed in lysimeter studies.
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Claims 15
Claim · model-written summary
Intermittent water deficit reduced seed weight by up to 54%.
- Taxon
- cowpea
Vigna unguiculatat0 - Treatment
- intermittent water deficite1
- Outcome
- seed weighte0
- Direction
- decreasese0
- Value
- 54%e0
- Comparator
- well-watere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed weight decreases up to 54% and 53% due to DH1 and DH2 respectively”
e1“well-water (BI), intermittent water deficit (DH1) and terminal water deficit (DH2)”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Terminal water deficit reduced seed weight by up to 53%.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- terminal water deficite1
- Outcome
- seed weighte0
- Direction
- decreasese0
- Value
- 53%e0
- Comparator
- well-watere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed weight decreases up to 54% and 53% due to DH1 and DH2 respectively”
e1“well-water (BI), intermittent water deficit (DH1) and terminal water deficit (DH2)”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Intermittent water deficit reduced transpiration efficiency by 15%.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- intermittent water deficite1
- Outcome
- transpiration efficiencye0
- Direction
- reducede0
- Value
- 15%e0
- Comparator
- well-watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These stress reduced transpiration efficiency (TE) by 15% and 13% respectively”
e1“intermittent water deficit (DH1) and terminal water deficit (DH2)”
e2“well-water (BI)”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Terminal water deficit reduced transpiration efficiency by 13%.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- terminal water deficite1
- Outcome
- transpiration efficiencye0
- Direction
- reducede0
- Value
- 13%e0
- Comparator
- well-watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These stress reduced transpiration efficiency (TE) by 15% and 13% respectively”
e1“intermittent water deficit (DH1) and terminal water deficit (DH2)”
e2“well-water (BI)”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Intermittent water deficit reduced harvest index by 38%.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- intermittent water deficite2
- Outcome
- harvest indexe0
- Direction
- reducede1
- Value
- 38%e0
- Comparator
- well-watere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“harvest index (HI) by 38% and 26% respectively”
e1“These stress reduced transpiration efficiency (TE) by 15% and 13% respectively, and harvest index (HI) by 38% and 26% respectively”
e2“intermittent water deficit (DH1) and terminal water deficit (DH2)”
e3“well-water (BI)”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Terminal water deficit reduced harvest index by 26%.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- terminal water deficite1
- Outcome
- harvest indexe0
- Direction
- reducede0
- Value
- 26%e0
- Comparator
- well-watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These stress reduced transpiration efficiency (TE) by 15% and 13% respectively, and harvest index (HI) by 38% and 26% respectively”
e1“intermittent water deficit (DH1) and terminal water deficit (DH2)”
e2“well-water (BI)”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Tiligré had an 85% seed weight decrease under intermittent water deficit.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- Tiligrée0
- Treatment
- intermittent water deficite1
- Outcome
- seed weighte0
- Direction
- decreasee0
- Value
- 85%e0
- Comparator
- well-watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest seed weight decrease was observed on Tiligré (85% and 78% under DH1 and DH2 respectively)”
e1“intermittent water deficit (DH1)”
e2“well-water (BI)”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Tiligré had a 78% seed weight decrease under terminal water deficit.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- Tiligrée0
- Treatment
- terminal water deficite1
- Outcome
- seed weighte0
- Direction
- decreasee0
- Value
- 78%e0
- Comparator
- well-watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest seed weight decrease was observed on Tiligré (85% and 78% under DH1 and DH2 respectively)”
e1“terminal water deficit (DH2)”
e2“well-water (BI)”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
IT98K-1111-1 had a 28% seed weight decrease under intermittent water deficit.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- IT98K-1111-1e0
- Treatment
- intermittent water deficite1
- Outcome
- seed weighte0
- Direction
- decreasee0
- Value
- 28%e0
- Comparator
- well-watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IT98K-1111-1 showed the lowest seed weight decrease (28% and 17% under DH1 and DH2 respectively)”
e1“intermittent water deficit (DH1)”
e2“well-water (BI)”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
IT98K-1111-1 had a 17% seed weight decrease under terminal water deficit.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- IT98K-1111-1e0
- Treatment
- terminal water deficite1
- Outcome
- seed weighte0
- Direction
- decreasee0
- Value
- 17%e0
- Comparator
- well-watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IT98K-1111-1 showed the lowest seed weight decrease (28% and 17% under DH1 and DH2 respectively)”
e1“terminal water deficit (DH2)”
e2“well-water (BI)”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Yield variation was mainly explained by matured pod number, transpiration efficiency and harvest index.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- matured podse0
- Outcome
- yield variatione0
- Qualifier
- number of matured pods, TE and HIe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield variation is mainly explained by the number of matured pods, TE and HI”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
IT98K-1111-1 had high transpiration efficiency and harvest index and was drought tolerant.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- IT98K-1111-1e0
- Outcome
- drought tolerante0
- Qualifier
- highest TE and HIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IT98K-1111-1 and IT96D-610 with highest TE and HI revealed drought tolerant”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
IT96D-610 had high transpiration efficiency and harvest index and was drought tolerant.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- IT96D-610e0
- Outcome
- drought tolerante0
- Qualifier
- highest TE and HIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IT98K-1111-1 and IT96D-610 with highest TE and HI revealed drought tolerant”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Drought sensitive genotypes had high transpiration.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- drought sensitive genotypese0
- Outcome
- transpiratione0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high transpiration was observed in drought sensitive genotypes”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
The field trial confirmed the agronomic trend observed in lysimeter studies.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- agronomical trende0
- Comparator
- lysimeter studiese0
- Setting
- field triale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The field trial confirmed agronomical trend observed in lysimeter studies”
t0“cowpea [Vigna unguiculata (L.) Walp.]”
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