Abstract
Abstract Estimates of N 2 fixation in segregating populations of bean plants based on 15 N‐isotope methods are technically demanding and expensive; therefore, indirect measures based on related traits including total seed N were used to select for improved N 2 fixation and yield. In 1985, six populations of F 2 ‐derived F 3 families resulting from six parental lines crossed to a common tester were grown in field trials on a low‐N soil. In 1986, 25 selected half‐sib families and two populations of full‐sib F 4 families were grown under similar conditions. Parents and a non‐nodulating soybean line were included both years. Narrow sense (H NS ) heritability estimates based on parent‐offspring regressions ranged from 0.57 for total seed N to 0.39 for shoot biomass in one population, but were near zero for all measured traits in a second population. Among the criteria used to identify parental lines with superior potential for producing progenies with high total seed N, testcross population means combined with estimates of realized heritability were the most reliable. Selection of the best F 3 families for total seed N resulted in F 4 families with increased total seed N and higher seed yields, while seed protein percentage was unchanged. When plants are grown on low‐N soils, selection for total seed N offers a useful alternative to selection for increased N 2 fixation based on 15 N‐isotopic or total‐N‐difference method.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Total seed N heritability was 0.57 in one population.
- Taxon
- Common Bean
Phaseolus vulgarist0 - Material
- one populatione0
- Outcome
- total seed Ne0
- Value
- 0.57e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Common Bean”
e0“Narrow sense (H NS ) heritability estimates based on parent‐offspring regressions ranged from 0.57 for total seed N to 0.39 for shoot biomass in one population”
Claim · model-written summary
Shoot biomass heritability was 0.39 in one population.
- Taxon
- Common BeanPhaseolus vulgarist0
- Outcome
- shoot biomasse0
- Value
- 0.39e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Common Bean”
e0“0.39 for shoot biomass in one population”
Claim · model-written summary
Heritability estimates were near zero for all measured traits in a second population.
- Taxon
- Common BeanPhaseolus vulgarist0
- Material
- a second populatione0
- Outcome
- all measured traitse0
- Value
- near zeroe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Common Bean”
e0“but were near zero for all measured traits in a second population”
Claim · model-written summary
Testcross population means combined with realized heritability were the most reliable parental selection criteria.
- Taxon
- Common BeanPhaseolus vulgarist0
- Outcome
- most reliablee0
- Comparator
- testcross population means combined with estimates of realized heritabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Common Bean”
e0“testcross population means combined with estimates of realized heritability were the most reliable”
Claim · model-written summary
Selecting F3 families for total seed N increased F4 total seed N.
- Taxon
- Common BeanPhaseolus vulgarist0
- Treatment
- Selection of the best F 3 families for total seed Ne0
- Outcome
- total seed Ne0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Common Bean”
e0“Selection of the best F 3 families for total seed N resulted in F 4 families with increased total seed N and higher seed yields, while seed protein percentage was unchanged”
Claim · model-written summary
Selecting F3 families for total seed N yielded higher F4 seed yields.
- Taxon
- Common BeanPhaseolus vulgarist0
- Treatment
- Selection of the best F 3 families for total seed Ne0
- Outcome
- seed yieldse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Common Bean”
e0“Selection of the best F 3 families for total seed N resulted in F 4 families with increased total seed N and higher seed yields, while seed protein percentage was unchanged”
Claim · model-written summary
Seed protein percentage was unchanged after selection.
- Taxon
- Common BeanPhaseolus vulgarist0
- Treatment
- Selection of the best F 3 families for total seed Ne0
- Outcome
- seed protein percentagee0
- Direction
- unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Common Bean”
e0“Selection of the best F 3 families for total seed N resulted in F 4 families with increased total seed N and higher seed yields, while seed protein percentage was unchanged”
Claim · model-written summary
On low-N soils, selection for total seed N offers an alternative to isotope or total-N-difference selection for fixation.
- Taxon
- Common BeanPhaseolus vulgarist0
- Outcome
- selection for total seed N offers a useful alternativee0
- Setting
- low‐N soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Common Bean”
e0“When plants are grown on low‐N soils, selection for total seed N offers a useful alternative to selection for increased N 2 fixation based on 15 N‐isotopic or total‐N‐difference method”