Abstract
Physiological studies had indicated that low mid-summer yields of alfalfa (Medicago sativa L.) can be attributed to high temperature. A program was initiated to study genetic variation for response to high temperatures. Two thousand genotypes were grown from seed in the growth room at 20/15 °C, harvested twice, then grown at 30/25 °C for two more harvests. A great deal of variation among genotypes was found to exist for response to temperature. Genotypes that were found to yield well at higher temperatures tended to be early-maturing with few stems per plant. Genotypes that yielded well at low temperatures tended to be later in maturity and to have a large number of stems. Based upon dry matter yields, 300 genotypes were selected to represent differences in responses, namely: 100 had high yields at high temperature only; 100, high at low temperature only; and 100, high at both temperatures. These selections were transplanted to the field for subsequent field trials to substantiate growth room findings. Little or no relationship was found between growth room performance and field performance. This lack of association was due in part to winter injury experienced the first year. In addition, temperatures experienced in the field were much lower than those used indoors.
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Claims 6
Claim · model-written summary
Alfalfa genotypes differed greatly in their response to temperature.
- Taxon
- alfalfa (Medicago sativa L.)
Medicago sativae0 - Material
- genotypese1
- Outcome
- variation among genotypese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low mid-summer yields of alfalfa (Medicago sativa L.)”
e1“A great deal of variation among genotypes was found to exist for response to temperature”
Claim · model-written summary
Alfalfa genotypes yielding well at higher temperatures tended to be early-maturing with few stems per plant.
- Taxon
- alfalfa (Medicago sativa L.)Medicago sativae0
- Material
- Genotypese2
- Treatment
- higher temperaturese2
- Outcome
- early-maturinge2
- Qualifier
- few stems per plante2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low mid-summer yields of alfalfa (Medicago sativa L.)”
e2“Genotypes that were found to yield well at higher temperatures tended to be early-maturing with few stems per plant”
Claim · model-written summary
Alfalfa genotypes yielding well at low temperatures tended to be later in maturity and to have a large number of stems.
- Taxon
- alfalfa (Medicago sativa L.)Medicago sativae0
- Material
- Genotypese3
- Treatment
- low temperaturese3
- Outcome
- later in maturitye3
- Qualifier
- a large number of stemse3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low mid-summer yields of alfalfa (Medicago sativa L.)”
e3“Genotypes that yielded well at low temperatures tended to be later in maturity and to have a large number of stems”
Claim · model-written summary
Growth-room performance and field performance of alfalfa genotypes showed little or no relationship.
- Taxon
- alfalfa (Medicago sativa L.)Medicago sativae0
- Outcome
- growth room performance and field performancee4
- Direction
- no relationshipe4
- Setting
- growth roome4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low mid-summer yields of alfalfa (Medicago sativa L.)”
e4“Little or no relationship was found between growth room performance and field performance”
Claim · model-written summary
The lack of association between growth-room and field performance was due in part to winter injury in the first year.
- Taxon
- alfalfa (Medicago sativa L.)Medicago sativae0
- Outcome
- lack of associatione5
- Qualifier
- winter injury experienced the first yeare5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low mid-summer yields of alfalfa (Medicago sativa L.)”
e5“This lack of association was due in part to winter injury experienced the first year”
Claim · model-written summary
Field temperatures were much lower than the temperatures used indoors.
- Taxon
- alfalfa (Medicago sativa L.)Medicago sativae0
- Outcome
- temperatures experienced in the fielde6
- Qualifier
- much lowere6
- Comparator
- those used indoorse6
- Setting
- in the fielde6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low mid-summer yields of alfalfa (Medicago sativa L.)”
e6“temperatures experienced in the field were much lower than those used indoors”