Abstract
SUMMARY This study examines the effects of increased atmospheric carbon dioxide concentrations on vegetative and reproductive growth and partitioning of biomass during pod and seed development of cow pea in controlled environment chambers at 350, 675, and 1000μl CO 2 /l. The length of main stem and branches, the number of leaves and branches, and leaf area were all greater at high CO 2 than at low CO 2 concentration. The appearance of flowers was 10–12 days earlier in high CO 2 than in ambient CO 2 atmosphere. The senescence of leaves started about 7 days earlier in plants grown at 675 and 1000 μl CO 2 /l than in those grown at 350 μl CO 2 /l. The rate of leaf senescence was more rapid in 1000 μl/l than in 675 μl CO 2 /l. The dry weight of roots, stems and leaves increased with CO 2 enrichment, being greater in 675 μl/l than in 1000 μl CO 2 /l. Plants grown in 675 and 1000 μ1/1 produced more pods and seeds than in 350 μl CO 2 /l. Total seed weight and number of pods, as well as number of seeds per pod, were significantly greater in CO 2 enriched atmosphere than ambient CO 2 level. Although CO 2 enrichment caused a significant increase in the total number and weight of seeds as well as pods, it did not affect the ratio of seed dry weight to the total dry weight of above-ground plant parts (harvest index). It is concluded from the present investigation that CO 2 enrichment significantly enhanced vegetative as well as reproductive growth resulting in the increase in yield and early plant maturation in this leguminous crop.
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Claims 9
Claim · model-written summary
High CO2 increased main stem and branch length, leaf and branch number, and leaf area.
- Taxon
- cow pea
Vigna unguiculatat0 - Treatment
- high CO 2e0
- Outcome
- length of main stem and branches, the number of leaves and branches, and leaf areae0
- Direction
- greatere0
- Comparator
- low CO 2 concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cow pea (Vigna unguiculata L.)”
e0“The length of main stem and branches, the number of leaves and branches, and leaf area were all greater at high CO 2 than at low CO 2 concentration”
Claim · model-written summary
Flowers appeared 10–12 days earlier under high CO2 than ambient CO2.
- Taxon
- cow peaVigna unguiculatat0
- Treatment
- high CO 2e0
- Outcome
- appearance of flowerse0
- Direction
- earliere0
- Value
- 10–12 dayse0
- Comparator
- ambient CO 2 atmospheree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cow pea (Vigna unguiculata L.)”
e0“The appearance of flowers was 10–12 days earlier in high CO 2 than in ambient CO 2 atmosphere”
Claim · model-written summary
Leaf senescence began about 7 days earlier at 675 and 1000 μl CO2/l than at 350 μl CO2/l.
- Taxon
- cow peaVigna unguiculatat0
- Treatment
- 675 and 1000 μl CO 2 /le0
- Outcome
- senescence of leavese0
- Direction
- earliere0
- Value
- 7 dayse0
- Comparator
- 350 μl CO 2 /le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cow pea (Vigna unguiculata L.)”
e0“The senescence of leaves started about 7 days earlier in plants grown at 675 and 1000 μl CO 2 /l than in those grown at 350 μl CO 2 /l”
Claim · model-written summary
Leaf senescence was more rapid at 1000 than at 675 μl CO2/l.
- Taxon
- cow peaVigna unguiculatat0
- Treatment
- 1000 μl/le0
- Outcome
- rate of leaf senescencee0
- Direction
- more rapide0
- Comparator
- 675 μl CO 2 /le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cow pea (Vigna unguiculata L.)”
e0“The rate of leaf senescence was more rapid in 1000 μl/l than in 675 μl CO 2 /l”
Claim · model-written summary
CO2 enrichment increased root, stem and leaf dry weight.
- Taxon
- cow peaVigna unguiculatat0
- Treatment
- CO 2 enrichmente0
- Outcome
- dry weight of roots, stems and leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cow pea (Vigna unguiculata L.)”
e0“The dry weight of roots, stems and leaves increased with CO 2 enrichment”
Claim · model-written summary
Root, stem and leaf dry weight was greater at 675 than 1000 μl CO2/l.
- Taxon
- cow peaVigna unguiculatat0
- Treatment
- 675 μl/le0
- Outcome
- dry weight of roots, stems and leavese0
- Direction
- greatere0
- Comparator
- 1000 μl CO 2 /le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cow pea (Vigna unguiculata L.)”
e0“The dry weight of roots, stems and leaves increased with CO 2 enrichment, being greater in 675 μl/l than in 1000 μl CO 2 /l”
Claim · model-written summary
Plants at 675 and 1000 μl CO2/l produced more pods and seeds than at 350 μl CO2/l.
- Taxon
- cow peaVigna unguiculatat0
- Treatment
- 675 and 1000 μ1/1e0
- Outcome
- pods and seedse0
- Direction
- moree0
- Comparator
- 350 μl CO 2 /le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cow pea (Vigna unguiculata L.)”
e0“Plants grown in 675 and 1000 μ1/1 produced more pods and seeds than in 350 μl CO 2 /l”
Claim · model-written summary
CO2 enrichment significantly increased total seed weight, pod number and seeds per pod.
- Taxon
- cow peaVigna unguiculatat0
- Treatment
- CO 2 enriched atmospheree0
- Outcome
- Total seed weight and number of pods, as well as number of seeds per pode0
- Direction
- greatere0
- Comparator
- ambient CO 2 levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cow pea (Vigna unguiculata L.)”
e0“Total seed weight and number of pods, as well as number of seeds per pod, were significantly greater in CO 2 enriched atmosphere than ambient CO 2 level”
Claim · model-written summary
CO2 enrichment did not significantly affect harvest index.
- Taxon
- cow peaVigna unguiculatat0
- Treatment
- CO 2 enrichmente1
- Outcome
- harvest indexe0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cow pea (Vigna unguiculata L.)”
e0“it did not affect the ratio of seed dry weight to the total dry weight of above-ground plant parts (harvest index)”
e1“CO 2 enrichment caused a significant increase”
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See all 8 papers →co2 · yield · Vigna unguiculata (cowpea)Results agree
3 papers in the same direction as this paper
- positive
- positive
- 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.