Abstract
Bambara groundnut is a protein-rich legume, with food-security potential. Effects of irrigation levels and seed coat colour on growth, development, yield and water-use efficiency of local bambara groundnut landrace selections were evaluated under a rain shelter. Emergence was slow, although variation was indicated between landraces. Limited water availability was shown to lower stomatal conductance, although chlorophyll content index was shown to be unaffected. Additionally, growth indices of plant height, leaf number and leaf area index were shown to be lower in response to decreasing water availability. Furthermore, landraces generally flowered and matured earlier while also demonstrating higher water-use efficiency at lower water availability. Seed yield was lower under limited water availability resulting from lower pod mass and pod number. Drought tolerance in bambara groundnut landraces was achieved by reduced canopy size, early flowering and maturity, and maintaining high water use efficiency under stress. ‘Brown’ and ‘Red’ landraces responded to water stress better than the ‘Light-brown’ landrace, suggesting an effect of seed colour on possible drought tolerance.Keywords: bambara groundnut landrace, growth, phenolology, water use efficiency, yield
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Claims 9
Claim · model-written summary
Emergence was slow and varied among landraces.
- Taxon
- bambara groundnut
Vigna subterraneat0 - Outcome
- Emergencee0
- Direction
- slowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Emergence was slow, although variation was indicated between landraces”
t0“bambara groundnut (Vigna subterranea L. Verdc)”
Claim · model-written summary
Limited water lowered stomatal conductance.
- Taxon
- bambara groundnutVigna subterraneat0
- Treatment
- Limited water availabilitye0
- Outcome
- stomatal conductancee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Limited water availability was shown to lower stomatal conductance”
t0“bambara groundnut (Vigna subterranea L. Verdc)”
Claim · model-written summary
Chlorophyll content index was unaffected by limited water.
- Taxon
- bambara groundnutVigna subterraneat0
- Treatment
- Limited water availabilitye1
- Outcome
- chlorophyll content indexe0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll content index was shown to be unaffected”
e1“Limited water availability”
t0“bambara groundnut (Vigna subterranea L. Verdc)”
Claim · model-written summary
Plant height, leaf number and leaf area index were lower with decreasing water.
- Taxon
- bambara groundnutVigna subterraneat0
- Treatment
- decreasing water availabilitye0
- Outcome
- plant height, leaf number and leaf area indexe0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant height, leaf number and leaf area index were shown to be lower in response to decreasing water availability”
t0“bambara groundnut (Vigna subterranea L. Verdc)”
Claim · model-written summary
Landraces flowered and matured earlier under lower water.
- Taxon
- bambara groundnutVigna subterraneat0
- Treatment
- lower water availabilitye0
- Outcome
- flowered and maturede0
- Direction
- earliere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“landraces generally flowered and matured earlier while also demonstrating higher water-use efficiency at lower water availability”
t0“bambara groundnut (Vigna subterranea L. Verdc)”
Claim · model-written summary
Landraces had higher water use efficiency under lower water.
- Taxon
- bambara groundnutVigna subterraneat0
- Treatment
- lower water availabilitye0
- Outcome
- water-use efficiencye0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher water-use efficiency at lower water availability”
t0“bambara groundnut (Vigna subterranea L. Verdc)”
Claim · model-written summary
Seed yield was lower with limited water.
- Taxon
- bambara groundnutVigna subterraneat0
- Treatment
- limited water availabilitye0
- Outcome
- Seed yielde0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed yield was lower under limited water availability”
t0“bambara groundnut (Vigna subterranea L. Verdc)”
Claim · model-written summary
Pod mass and pod number were lower with limited water.
- Taxon
- bambara groundnutVigna subterraneat0
- Treatment
- limited water availabilitye0
- Outcome
- pod mass and pod numbere0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under limited water availability resulting from lower pod mass and pod number”
t0“bambara groundnut (Vigna subterranea L. Verdc)”
Claim · model-written summary
Brown and Red landraces responded better than Light-brown.
- Taxon
- bambara groundnutVigna subterraneat0
- Material
- ‘Brown’ and ‘Red’ landracese0
- Outcome
- responded to water stress bettere0
- Direction
- bettere0
- Comparator
- ‘Light-brown’ landracee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Brown’ and ‘Red’ landraces responded to water stress better than the ‘Light-brown’ landrace”
t0“bambara groundnut (Vigna subterranea L. Verdc)”
The same questions in other papers
soil water · growth · Vigna subterranea (Bambara groundnut)Positive and negative results
1 in the opposite direction
- positive
soil water · yield · Vigna subterranea (Bambara groundnut)Positive and negative results
2 in the opposite direction
- positive
- positive
soil water · physiology: water · Vigna subterranea (Bambara groundnut)Results agree
1 paper in the same direction as this paper
- positive
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.