Abstract
Successful establishment of alfalfa ( Medicago sativa L.) stands in early spring may require emergence and seedling growth at soil temperatures below 10°C. The objectives of this experiment were to evaluate changes in emergence and seedling height after laboratory selection in six cultivars at suboptimal temperature for (i) early germination (EG), (ii) high seedling vigor (HSV), (iii) EG + HSV, or (iv) late germination and low seedling vigor (LG + LSV). Cycles (C) 0 to 2 were evaluated for emergence 8 d after planting, seedling height (SH) 27 d after planting, forage dry matter yield, and other agronomic traits in field trials at Ames and Nashua, IA, in early spring 1998. Emergence was improved in all selected populations at Ames but not at Nashua; HSV and EG + HSV selection were most effective at improving emergence. After two cycles, seedling height was increased 21% by HSV selection and 9% by EG selection; however, the response among cultivars was highly variable. Combined EG + HSV selection was less effective than HSV alone at increasing height. Selection for LG + LSV did not reduce seedling height in the field even though large decreases were previously observed in the laboratory. Most gain from selection was realized with C1, possibly because the variable seed production environment in the greenhouse may have limited more consistent responses in C2. Seedling height selection at suboptimal temperatures in the laboratory successfully improved seedling height in the field in some alfalfa populations without changing other agronomic characteristics.
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Claims 11
Claim · model-written summary
Emergence was improved in all selected alfalfa populations at Ames.
- Taxon
- Medicago sativa
Medicago sativae0 - Material
- selected populationse1
- Treatment
- laboratory selectione2
- Outcome
- Emergencee1
- Direction
- improvede1
- Setting
- Amese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“Emergence was improved in all selected populations at Ames”
e2“after laboratory selection in six cultivars at suboptimal temperature”
Claim · model-written summary
Emergence was not improved by selection at Nashua.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- laboratory selectione3
- Outcome
- Emergencee1
- Direction
- no_changeinferrede1
- Setting
- Nashuae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“Emergence was improved in all selected populations at Ames”
e2“but not at Nashua”
e3“after laboratory selection in six cultivars at suboptimal temperature”
Claim · model-written summary
HSV selection and EG + HSV selection were the most effective treatments at improving emergence.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- HSV and EG + HSV selectione3
- Outcome
- most effective at improving emergencee3
- Direction
- most effective at improvinge3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e3“HSV and EG + HSV selection were most effective at improving emergence”
Claim · model-written summary
HSV selection increased seedling height by 21% after two cycles.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- HSV selectione4
- Outcome
- seedling heighte4
- Direction
- increasede4
- Value
- 21%e4
- Qualifier
- After two cyclese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e4“After two cycles, seedling height was increased 21% by HSV selection”
Claim · model-written summary
EG selection increased seedling height by 9% after two cycles.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- EG selectione5
- Outcome
- seedling heighte5
- Direction
- increasede5
- Value
- 9%e5
- Qualifier
- After two cyclese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e4“After two cycles, seedling height was increased 21% by HSV selection”
e5“seedling height was increased 21% by HSV selection and 9% by EG selection”
Claim · model-written summary
Combined EG + HSV selection was less effective than HSV alone at increasing seedling height.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- Combined EG + HSV selectione6
- Outcome
- increasing heighte6
- Direction
- less effectivee6
- Comparator
- HSV alonee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e6“Combined EG + HSV selection was less effective than HSV alone at increasing height”
Claim · model-written summary
Selection for LG + LSV did not reduce seedling height in the field.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- Selection for LG + LSVe7
- Outcome
- seedling heighte7
- Direction
- no_changeinferrede7
- Setting
- fielde7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e7“Selection for LG + LSV did not reduce seedling height in the field”
Claim · model-written summary
Most gain from selection was realized with C1.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- C1e1
- Outcome
- gain from selectione1
- Direction
- higherinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“Most gain from selection was realized with C1”
Claim · model-written summary
Seedling height selection at suboptimal temperature in the laboratory improved seedling height in the field in some alfalfa populations.
- Taxon
- Medicago sativaMedicago sativae0
- Material
- alfalfa populationse1
- Treatment
- Seedling height selection at suboptimal temperatures in the laboratorye1
- Outcome
- seedling heighte1
- Direction
- improvede1
- Setting
- in the fielde1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“Seedling height selection at suboptimal temperatures in the laboratory successfully improved seedling height in the field in some alfalfa populations”
Claim · model-written summary
Seedling height selection at suboptimal temperature did not change other agronomic characteristics.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- Seedling height selection at suboptimal temperatures in the laboratorye1
- Outcome
- other agronomic characteristicse2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“Seedling height selection at suboptimal temperatures in the laboratory successfully improved seedling height in the field in some alfalfa populations”
e2“without changing other agronomic characteristics”
Claim · model-written summary
The response among alfalfa cultivars to selection was highly variable.
- Taxon
- Medicago sativaMedicago sativae0
- Outcome
- response among cultivarse1
- Qualifier
- highly variablee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“the response among cultivars was highly variable”
The same questions in other papers
processing · growth · Medicago sativa (alfalfa)Positive and negative results
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