Abstract
Four maize (Zea mays L.) gene pools which differed in degree of diversity, adaptation, and number of previous cycles of recombination were developed for several generations under open pollination and high plant densities. Significant yield increases occurred over generations in two gene pools, but later generations of all gene pools tended to yield more in high yielding environments than did the early generations, indicating that genotypes with greater potential had been selected. Error variances were larger for the two gene pools without a previous history of recombination, probably reflecting the greater heterogeneity of the components during the early generations. The gene pool developed from adapted material was the most tolerant to high plant densities, although later generations had less tolerance to high densities than earlier ones. Development at high plant densities did improve the tolerance of the gene pools containing exotic germ plasm. It was concluded that development of populations at high plant densities for the initial generation or two is a reasonable approach for the improvement of unadapted material or newly synthesized populations, but it could not be recommended for adapted material which had previously undergone several cycles of recombination.
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Claims 8
Claim · model-written summary
Yield increased significantly across generations in two gene pools.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant yield increases occurred over generations in two gene pools”
t0“MAIZE GENE POOLS”
Claim · model-written summary
Later generations tended to yield more in high yielding environments.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“later generations of all gene pools tended to yield more in high yielding environments than did the early generations”
t0“MAIZE GENE POOLS”
Claim · model-written summary
Error variances were larger for gene pools lacking prior recombination.
- Material
- two gene pools without a previous history of recombinatione0
- Outcome
- Error variancese0
- Direction
- largere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Error variances were larger for the two gene pools without a previous history of recombination”
t0“MAIZE GENE POOLS”
Claim · model-written summary
The adapted gene pool was most tolerant to high density.
- Material
- gene pool developed from adapted materiale0
- Outcome
- tolerant to high plant densitiese0
- Direction
- most tolerante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The gene pool developed from adapted material was the most tolerant to high plant densities”
t0“MAIZE GENE POOLS”
Claim · model-written summary
Later generations had less density tolerance than earlier generations.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“later generations had less tolerance to high densities than earlier ones”
t0“MAIZE GENE POOLS”
Claim · model-written summary
High density development improved tolerance in exotic germplasm pools.
- Material
- gene pools containing exotic germ plasme0
- Treatment
- Development at high plant densitiese0
- Outcome
- tolerancee0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Development at high plant densities did improve the tolerance of the gene pools containing exotic germ plasm”
t0“MAIZE GENE POOLS”
Claim · model-written summary
Authors recommend initial high density development for unadapted or newly synthesized populations.
- Outcome
- development of populations at high plant densities for the initial generation or twoe0
- Qualifier
- unadapted material or newly synthesized populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“development of populations at high plant densities for the initial generation or two is a reasonable approach for the improvement of unadapted material or newly synthesized populations”
t0“MAIZE GENE POOLS”
Claim · model-written summary
Authors do not recommend high density development for adapted material with prior recombination.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“could not be recommended for adapted material which had previously undergone several cycles of recombination”
t0“MAIZE GENE POOLS”
The same questions in other papers
density · disease · Zea mays (maize)Positive and negative results
1 paper in the same direction as this paper · 10 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- no effect
- no effect
10 papers more in this group
See all 14 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.