Abstract
L.) in association with rhizobia is often characterized as poor compared to other legumes, and nitrogen fertilizers are commonly used in bean production to achieve high yields, which in general inhibits nitrogen fixation. In addition, plants cannot take up all the nitrogen applied to the soil as a fertilizer leading to runoff and groundwater contamination. The overall objective of this work is to reduce use of nitrogen fertilizer in common bean production. This would be a major advance in profitability for the common bean industry in Canada and would significantly improve the ecological footprint of the crop. In the current work, 22 bean genotypes [including recombinant inbred lines (RILs) from the Mist × Sanilac population and a non-nodulating mutant (R99)] were screened for their capacity to fix atmospheric nitrogen under four nitrogen regimes. The genotypes were evaluated in replicated field trials on N-poor soils over three years for the percent nitrogen derived from atmosphere (%Ndfa), yield, and a number of yield-related traits. Bean genotypes differed for all analyzed traits, and the level of nitrogen significantly affected most of the traits, including %Ndfa and yield in all three years. In contrast, application of rhizobia significantly affected only few traits, and the effect was inconsistent among the years. Nitrogen application reduced symbiotic nitrogen fixation (SNF) to various degrees in different bean genotypes. This variation suggests that SNF in common bean can be improved through breeding and selection for the ability of bean genotypes to fix nitrogen in the presence of reduced fertilizer levels. Moreover, genotypes like RIL_38, RIL_119, and RIL_131, being both high yielding and good nitrogen fixers, have potential for simultaneous improvement of both traits. However, breeding advancement might be slow due to an inconsistent correlation between these traits.
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Claims 9
Claim · model-written summary
Bean genotypes differed across all analyzed traits.
Verbatim
e0“Bean genotypes differed for all analyzed traits”
Claim · model-written summary
Nitrogen level significantly affected percent nitrogen derived from atmosphere and yield across three years.
- Taxon
- common bean
Phaseolus vulgarist0 - Treatment
- level of nitrogene0
- Outcome
- %Ndfa and yielde0
- Qualifier
- in all three yearse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of nitrogen significantly affected most of the traits, including %Ndfa and yield in all three years”
t0“Common Bean”
Claim · model-written summary
Rhizobia application significantly affected only a few traits and varied among years.
- Taxon
- Common BeanPhaseolus vulgarist0
- Treatment
- application of rhizobiae0
- Interactor
- rhizobiae0symbiont
- Outcome
- few traitse0
- Qualifier
- inconsistent among the yearse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of rhizobia significantly affected only few traits, and the effect was inconsistent among the years”
t0“Common Bean”
Claim · model-written summary
Nitrogen application reduced symbiotic nitrogen fixation to varying degrees across genotypes.
- Taxon
- beane0
- Material
- different bean genotypese0
- Treatment
- Nitrogen applicatione0
- Outcome
- symbiotic nitrogen fixation (SNF)e0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Nitrogen application reduced symbiotic nitrogen fixation (SNF) to various degrees in different bean genotypes”
Claim · model-written summary
RIL_38 was high yielding and fixed nitrogen well.
- Taxon
- common beanPhaseolus vulgarist0
- Material
- RIL_38e0
- Outcome
- high yielding and good nitrogen fixerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypes like RIL_38, RIL_119, and RIL_131, being both high yielding and good nitrogen fixers”
t0“common bean”
Claim · model-written summary
RIL_119 was high yielding and fixed nitrogen well.
- Taxon
- common beanPhaseolus vulgarist0
- Material
- RIL_119e0
- Outcome
- high yielding and good nitrogen fixerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypes like RIL_38, RIL_119, and RIL_131, being both high yielding and good nitrogen fixers”
t0“common bean”
Claim · model-written summary
RIL_131 was high yielding and fixed nitrogen well.
- Taxon
- common beanPhaseolus vulgarist0
- Material
- RIL_131e0
- Outcome
- high yielding and good nitrogen fixerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypes like RIL_38, RIL_119, and RIL_131, being both high yielding and good nitrogen fixers”
t0“common bean”
Claim · model-written summary
Yield and nitrogen fixation had an inconsistent correlation.
- Taxon
- common beanPhaseolus vulgarist0
- Outcome
- inconsistent correlation between these traitse0
- Qualifier
- breeding advancement might be slowe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“breeding advancement might be slow due to an inconsistent correlation between these traits”
t0“common bean”
Claim · model-written summary
Variation in fixation suggests potential for breeding fixation under reduced fertilizer.
- Taxon
- common beanPhaseolus vulgarise0
- Outcome
- breeding and selection for the ability of bean genotypes to fix nitrogen in the presence of reduced fertilizer levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SNF in common bean can be improved through breeding and selection for the ability of bean genotypes to fix nitrogen in the presence of reduced fertilizer levels”
The same questions in other papers
nitrogen · symbiosis · Phaseolus vulgaris (common bean)Results differ
21 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- negative
27 papers more in this group
See all 31 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.