Abstract
Alfalfa ( Medicago sativa L.) seeded in early spring often germinates and emerges under cold temperatures. We conducted this study to determine if phenotypic recurrent selection improved germination time and seedling growth under cool temperatures in the laboratory. Four selection methods were conducted in the laboratory for two cycles within six commercial alfalfa cultivars: 5454, Alfagraze, Amerigraze 401+Z, Innovator +Z, Magnum IV, and WL252HQ ranging in fall dormancy class from two to four. Cycles 0, 1, and 2 were evaluated in controlled environmental chambers. Two cycles of selection for rapid germination at 5°C decreased germination time (GT) by 29%. Response to selection was greatest in the first cycle. Two cycles of selection for high seedling vigor increased seedling height (SH) after 45 d at 10°C by 15%. In some cultivars, selection for high seedling vigor was effective at increasing SH in the laboratory and further increases may be expected. Selection for high seedling vigor increased GT, indicating an association between these traits under laboratory conditions. The mean realized heritability estimates were 0.49 for GT and 0.18 for SH. Selection for both early germination and high seedling vigor resulted in an average decrease in GT of 29% with no effect on SH after two cycles, but combined selection against both traits increased GT by 162% and decreased SH by 18%. Laboratory selection for decreased GT and increased SH under low temperatures can be successful, but the amount of improvement is population dependant.
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Claims 12
Claim · model-written summary
Two cycles of selection for rapid germination at 5°C decreased germination time by 29%.
- Taxon
- Medicago sativa
Medicago sativae0 - Treatment
- selection for rapid germination at 5°Ce1
- Outcome
- germination time (GT)e1
- Direction
- decreasede1
- Value
- 29%e1
- Setting
- in the laboratorye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e1“Two cycles of selection for rapid germination at 5°C decreased germination time (GT) by 29%”
e2“Four selection methods were conducted in the laboratory”
Claim · model-written summary
Two cycles of selection for high seedling vigour increased seedling height by 15% after 45 d at 10°C.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- selection for high seedling vigore4
- Outcome
- seedling height (SH)e4
- Direction
- increasede4
- Value
- 15%e4
- Qualifier
- after 45 d at 10°Ce4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e4“Two cycles of selection for high seedling vigor increased seedling height (SH) after 45 d at 10°C by 15%”
Claim · model-written summary
In some cultivars, selection for high seedling vigour was effective at increasing seedling height in the laboratory.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- selection for high seedling vigore5
- Outcome
- SHe5
- Direction
- increasinge5
- Qualifier
- In some cultivarse5
- Setting
- in the laboratorye5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e5“In some cultivars, selection for high seedling vigor was effective at increasing SH in the laboratory”
Claim · model-written summary
Selection for high seedling vigour increased germination time, indicating an association between these traits under laboratory conditions.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- Selection for high seedling vigore6
- Outcome
- GTe6
- Direction
- increasede6
- Setting
- under laboratory conditionse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e6“Selection for high seedling vigor increased GT, indicating an association between these traits under laboratory conditions”
Claim · model-written summary
Response to selection was greatest in the first cycle.
- Taxon
- Medicago sativaMedicago sativae0
- Outcome
- Response to selectione7
- Direction
- greateste7
- Qualifier
- in the first cyclee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e7“Response to selection was greatest in the first cycle”
Claim · model-written summary
Realized heritability of germination time was 0.49.
- Taxon
- Medicago sativaMedicago sativae0
- Outcome
- realized heritabilitye1
- Value
- 0.49e1
- Qualifier
- for GTe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e1“The mean realized heritability estimates were 0.49 for GT and 0.18 for SH”
Claim · model-written summary
Realized heritability of seedling height was 0.18.
- Taxon
- Medicago sativaMedicago sativae0
- Outcome
- realized heritabilitye1
- Value
- 0.18e1
- Qualifier
- for SHe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e1“The mean realized heritability estimates were 0.49 for GT and 0.18 for SH”
Claim · model-written summary
Selection for both early germination and high seedling vigour decreased germination time by 29% on average.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- Selection for both early germination and high seedling vigore1
- Outcome
- GTe1
- Direction
- decreasee1
- Value
- 29%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e1“Selection for both early germination and high seedling vigor resulted in an average decrease in GT of 29% with no effect on SH after two cycles”
Claim · model-written summary
Selection for both early germination and high seedling vigour had no effect on seedling height after two cycles.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- Selection for both early germination and high seedling vigore1
- Outcome
- SHe1
- Direction
- no effecte1
- Qualifier
- after two cyclese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e1“Selection for both early germination and high seedling vigor resulted in an average decrease in GT of 29% with no effect on SH after two cycles”
Claim · model-written summary
Combined selection against both traits increased germination time by 162%.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- combined selection against both traitse1
- Outcome
- GTe1
- Direction
- increasede1
- Value
- 162%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e1“combined selection against both traits increased GT by 162% and decreased SH by 18%”
Claim · model-written summary
Combined selection against both traits decreased seedling height by 18%.
- Taxon
- Medicago sativaMedicago sativae0
- Treatment
- combined selection against both traitse1
- Outcome
- SHe1
- Direction
- decreasede1
- Value
- 18%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e1“combined selection against both traits increased GT by 162% and decreased SH by 18%”
Claim · model-written summary
Laboratory selection for decreased germination time and increased seedling height at low temperature can be successful, but the amount of improvement is population dependent.
- Taxon
- Medicago sativaMedicago sativae0
- Outcome
- improvemente1
- Qualifier
- population dependante1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa ( Medicago sativa L.)”
e1“Laboratory selection for decreased GT and increased SH under low temperatures can be successful, but the amount of improvement is population dependant”
The same questions in other papers
processing · growth · Medicago sativa (alfalfa)Positive and negative results
14 papers in the same direction as this paper · 8 in the opposite direction · 1 reporting no difference from an alternative
- positive
- negative
- negative
20 papers more in this group
See all 24 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.