Abstract
Potassium is major nutritional factor influencing plants' ability to overcome stress. Thus the effect of this nutrient on plant growth and symbiotic nitrogen fixation could be critical. A study was conducted to evaluate the influence of three levels of potassium fertiliser (0·1, 0·8 and 3·0 mM potassium) and two day/night temperature regimes (30°C/23°C—supra-optimal and 23°C/18°C—optimal) on the vegetative growth and symbiotic nitrogen fixation of two legumes. The crops selected were faba bean, an amide producing temperate species, and French beans, a ureide-producing tropical legume. Potassium increased relative growth rates of faba bean to a greater extent than in French beans with 3·0 mM potassium under the high temperatures. The influence of potassium was less evident at the lower temperature. Specific leaf weights of both species were reduced by potassium indicating the influence of this nutrient in the process of translocation of photosynthates. Total nitrogen concentrations of both species were lower and potassium concentrations were greater under supra-optimal temperatures. Nodulation was not observed in faba beans at this temperature. Potassium increased nodulation and nitrogen fixation of faba bean under optimal temperatures and at both temperatures in French beans. In contrast, specific activity of nodules and percentage nitrogen derived from fixation were not affected by potassium at both temperatures. Potassium reduced the impact of high temperatures especially in temperate faba beans when compared with tropical French beans by enhancing vegetative growth, nodulation and total tropical nitrogen fixation.
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Claims 9
Claim · model-written summary
Potassium increased relative growth rates of faba bean more than French beans with 3·0 mM potassium under high temperatures.
- Taxon
- faba bean
Vicia fabae0 - Treatment
- 3·0 mM potassiume1
- Outcome
- relative growth ratese1
- Direction
- increasede1
- Qualifier
- under the high temperaturese1
- Comparator
- French beanse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crops selected were faba bean, an amide producing temperate species, and French beans, a ureide-producing tropical legume”
e1“Potassium increased relative growth rates of faba bean to a greater extent than in French beans with 3·0 mM potassium under the high temperatures”
Claim · model-written summary
Potassium reduced specific leaf weights of both species.
- Taxon
- faba beanVicia fabae0
- Treatment
- potassiume2
- Outcome
- Specific leaf weightse2
- Direction
- reducede2
- Qualifier
- both speciese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crops selected were faba bean, an amide producing temperate species, and French beans, a ureide-producing tropical legume”
e2“Specific leaf weights of both species were reduced by potassium”
Claim · model-written summary
Total nitrogen concentrations of both species were lower under supra-optimal temperatures.
- Taxon
- faba beanVicia fabae0
- Treatment
- supra-optimal temperaturese3
- Outcome
- Total nitrogen concentrationse3
- Direction
- lowere3
- Qualifier
- both speciese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crops selected were faba bean, an amide producing temperate species, and French beans, a ureide-producing tropical legume”
e3“Total nitrogen concentrations of both species were lower and potassium concentrations were greater under supra-optimal temperatures”
Claim · model-written summary
Potassium concentrations of both species were greater under supra-optimal temperatures.
- Taxon
- faba beanVicia fabae0
- Treatment
- supra-optimal temperaturese3
- Outcome
- potassium concentrationse3
- Direction
- greatere3
- Qualifier
- both speciese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crops selected were faba bean, an amide producing temperate species, and French beans, a ureide-producing tropical legume”
e3“Total nitrogen concentrations of both species were lower and potassium concentrations were greater under supra-optimal temperatures”
Claim · model-written summary
Nodulation was not observed in faba beans at supra-optimal temperature.
- Taxon
- faba beansVicia fabae4
- Outcome
- Nodulatione4
- Qualifier
- not observede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crops selected were faba bean, an amide producing temperate species, and French beans, a ureide-producing tropical legume”
e4“Nodulation was not observed in faba beans at this temperature”
Claim · model-written summary
Potassium increased nodulation and nitrogen fixation of faba bean under optimal temperatures.
- Taxon
- faba beanVicia fabae5
- Treatment
- Potassiume5
- Outcome
- nodulation and nitrogen fixatione5
- Direction
- increasede5
- Qualifier
- under optimal temperaturese5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crops selected were faba bean, an amide producing temperate species, and French beans, a ureide-producing tropical legume”
e5“Potassium increased nodulation and nitrogen fixation of faba bean under optimal temperatures and at both temperatures in French beans”
Claim · model-written summary
Potassium increased nodulation and nitrogen fixation of French beans at both temperatures.
- Taxon
- French beans
Phaseolus vulgarise5 - Treatment
- Potassiume5
- Outcome
- nodulation and nitrogen fixatione5
- Direction
- increasede5
- Qualifier
- at both temperaturese5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crops selected were faba bean, an amide producing temperate species, and French beans, a ureide-producing tropical legume”
e5“Potassium increased nodulation and nitrogen fixation of faba bean under optimal temperatures and at both temperatures in French beans”
Claim · model-written summary
Potassium did not affect specific activity of nodules or percentage nitrogen derived from fixation at either temperature.
- Taxon
- faba beanVicia fabae0
- Treatment
- potassiume6
- Outcome
- specific activity of nodules and percentage nitrogen derived from fixatione6
- Direction
- not affectede6
- Qualifier
- at both temperaturese6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crops selected were faba bean, an amide producing temperate species, and French beans, a ureide-producing tropical legume”
e6“specific activity of nodules and percentage nitrogen derived from fixation were not affected by potassium at both temperatures”
Claim · model-written summary
Potassium reduced the impact of high temperatures in temperate faba beans compared with tropical French beans.
- Taxon
- faba beansVicia fabae7
- Treatment
- Potassiume7
- Outcome
- impact of high temperaturese7
- Direction
- reducede7
- Qualifier
- especially in temperate faba beanse7
- Comparator
- tropical French beanse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Potassium reduced the impact of high temperatures especially in temperate faba beans when compared with tropical French beans”
The same questions in other papers
potassium · symbiosis · Vicia faba (faba bean)Results agree
1 paper in the same direction as this paper
- positive
potassium · symbiosis · Phaseolus vulgaris (common bean)Results agree
1 paper in the same direction as this paper
- positive
potassium · growth · Vicia faba (faba bean)Results agree
6 papers in the same direction as this paper
- positive
- positive
- positive
3 papers more in this group
See all 7 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.