Abstract
SUMMARY The effects of climatic factors on the growth, reproductive development and seed yield of cowpea (cv. K 2809) were investigated in controlled environment cabinets. Plants were grown to maturity in eight environments comprising all combinations of two day lengths (11 h 40 min and 13 h 20 min), two day (27 and 33 o C) and two night (19 and 24 o C) temperatures. The plants were nodulated ( Rhizobium strain CB 756) and received 197 ppm N throughout growth. Treatments changed the time to the appearance of first flowers by a maximum of 6 days but the later‐flowering plants more than doubled their dry weight during this period, so that effects on plant form and, ultimately, seed production were considerable. Warm nights (24 o C) not only hastened the onset of flowering but also enhanced dry matter production during the pre‐flowering period; they did not extend the total growing period. Warm days (33 o C) did not enhance dry matter production but shortened the duration of the growing period by an average of 21 days (20%). Variation in final seed yield was mainly due to differences in the number of pods borne on branches. Warm days markedly decreased the number of pods per plant (an overall average reduction of 49%) as did warm nights in conjunction with the long (13 h 20) daylength. The number of seeds per pod was effected only by daylength (8.3 and 7.6 seeds in the long and short daylengths, respectively). Mean seed weight was decreased by 19% in warm as compared to cool nights but was increased by 18% in warm as compared to cool days. These responses are compared with those obtained with soyabean cv. TK5 in a previous experiment and are shown, in general, to be similar.
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Claims 9
Claim · model-written summary
Warm nights (24 C) hastened the onset of flowering in cowpea.
- Taxon
- cowpea
Vigna unguiculatae0 - Material
- cv. K 2809e0
- Treatment
- Warm nightse1
- Outcome
- onset of floweringe1
- Direction
- hastenede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth, reproductive development and seed yield of cowpea (cv. K 2809)”
e1“Warm nights (24 o C) not only hastened the onset of flowering but also enhanced dry matter production during the pre‐flowering period”
Claim · model-written summary
Warm nights enhanced dry matter production during the pre-flowering period.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- cv. K 2809e0
- Organ / stage
- pre‐flowering periode1
- Treatment
- Warm nightse1
- Outcome
- dry matter productione1
- Direction
- enhancede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth, reproductive development and seed yield of cowpea (cv. K 2809)”
e1“Warm nights (24 o C) not only hastened the onset of flowering but also enhanced dry matter production during the pre‐flowering period”
Claim · model-written summary
Warm days (33 C) did not enhance dry matter production.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- cv. K 2809e0
- Treatment
- Warm dayse1
- Outcome
- dry matter productione1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth, reproductive development and seed yield of cowpea (cv. K 2809)”
e1“Warm days (33 o C) did not enhance dry matter production but shortened the duration of the growing period by an average of 21 days (20%)”
Claim · model-written summary
Warm days shortened the growing period by an average of 21 days (20%).
- Taxon
- cowpeaVigna unguiculatae0
- Material
- cv. K 2809e0
- Treatment
- Warm dayse1
- Outcome
- duration of the growing periode1
- Direction
- shortenede1
- Value
- 21 days (20%)e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth, reproductive development and seed yield of cowpea (cv. K 2809)”
e1“Warm days (33 o C) did not enhance dry matter production but shortened the duration of the growing period by an average of 21 days (20%)”
Claim · model-written summary
Warm days markedly decreased the number of pods per plant, by 49% on average.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- cv. K 2809e0
- Treatment
- Warm dayse1
- Outcome
- number of pods per plante1
- Direction
- decreasede1
- Value
- 49%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth, reproductive development and seed yield of cowpea (cv. K 2809)”
e1“Warm days markedly decreased the number of pods per plant (an overall average reduction of 49%) as did warm nights in conjunction with the long (13 h 20) daylength”
Claim · model-written summary
Warm nights in conjunction with the long daylength also decreased pods per plant.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- cv. K 2809e0
- Treatment
- warm nights in conjunction with the long (13 h 20) daylengthe1
- Outcome
- number of pods per plante1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth, reproductive development and seed yield of cowpea (cv. K 2809)”
e1“Warm days markedly decreased the number of pods per plant (an overall average reduction of 49%) as did warm nights in conjunction with the long (13 h 20) daylength”
Claim · model-written summary
Number of seeds per pod was affected only by daylength (8.3 long, 7.6 short).
- Taxon
- cowpeaVigna unguiculatae0
- Material
- cv. K 2809e0
- Treatment
- daylengthe1
- Outcome
- number of seeds per pode1
- Direction
- higherinferrede1
- Value
- 8.3 and 7.6 seedse1
- Comparator
- short daylengthse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth, reproductive development and seed yield of cowpea (cv. K 2809)”
e1“The number of seeds per pod was effected only by daylength (8.3 and 7.6 seeds in the long and short daylengths, respectively)”
Claim · model-written summary
Mean seed weight was 19% lower in warm than in cool nights.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- cv. K 2809e0
- Treatment
- warm as compared to cool nightse1
- Outcome
- Mean seed weighte1
- Direction
- decreasede1
- Value
- 19%e1
- Comparator
- cool nightse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth, reproductive development and seed yield of cowpea (cv. K 2809)”
e1“Mean seed weight was decreased by 19% in warm as compared to cool nights but was increased by 18% in warm as compared to cool days”
Claim · model-written summary
Mean seed weight was 18% higher in warm than in cool days.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- cv. K 2809e0
- Treatment
- warm as compared to cool dayse1
- Outcome
- Mean seed weighte1
- Direction
- increasede1
- Value
- 18%e1
- Comparator
- cool dayse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth, reproductive development and seed yield of cowpea (cv. K 2809)”
e1“Mean seed weight was decreased by 19% in warm as compared to cool nights but was increased by 18% in warm as compared to cool days”
The same questions in other papers
light · yield · Vigna unguiculata (cowpea)Positive and negative results
6 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
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7 papers more in this group
See all 11 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.