Abstract
The objectives of this research were to evaluate the relative importance of general (GCA) and specific combining ability (SCA) for forage yield in orchardgrass ( Dactylis glomerata L.) and determine if more nearly consistent results could be obtained by separating GCA and SCA into components associated with annually recurring changes and changes related to age of stand. For this purpose, seeded plots of hybrids from six diallel crosses involving 11 parental clones were harvested 28 times during a 5‐year period (4th year excluded). GCA was significant for most harvests, seasons, and years, and for total 4‐year production. SCA was significant for spring and annual production of the first 2 years. Interactions of GCA with seasons and of SCA with years were significant. Interseasonal correlation coefficients based on total 4‐year production for spring vs. summer, spring vs. fall, and summer vs. fall, respectively, were 0.25, 0.45, and 0.58 for GCA effects, and 0.64, 0.19, and 0.63 for SCA effects. Interannual correlation coefficients based on annual yields in consecutive years (excluding 1967) starting with 1964–1965 were − 0.16, 0.45, 0.65 for GCA effects and 0.42, 0.38, and − 0.18 for SCA effects. The data suggested an annual recurrence of relative seasonal magnitudes of GCA and SCA with interannual stability increasing for GCA and decreasing for SCA as the stand aged. Most effective selection for forage production based on GCA probably would be on a seasonal basis in the 3rd year after seeding. Selection based on SCA appears questionable, although it might be successful for initial spring production.
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 12
Claim · model-written summary
General combining ability (GCA) for forage yield in orchardgrass was significant for most harvests, seasons and years and for total 4-year production.
- Taxon
- Orchardgrass
.jpg?width=60)
Dactylis glomeratat0 - Outcome
- GCAe0
- Qualifier
- most harvests, seasons, and yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Orchardgrass”
e0“GCA was significant for most harvests, seasons, and years, and for total”
Claim · model-written summary
Specific combining ability (SCA) for forage yield was significant for spring and annual production of the first 2 years.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- SCAe0
- Qualifier
- spring and annual production of the first 2 yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“SCA was significant for spring and annual production of the first 2 years”
Claim · model-written summary
The interactions of GCA with seasons and of SCA with years were significant.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- Interactions of GCA with seasons and of SCA with yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“Interactions of GCA with seasons and of SCA with years were significant”
Claim · model-written summary
Interseasonal correlation coefficients for GCA effects were 0.25, 0.45 and 0.58 for spring vs. summer, spring vs. fall and summer vs. fall.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- Interseasonal correlation coefficientse0
- Value
- 0.25, 0.45, and 0.58e1
- Qualifier
- GCA effectse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“Interseasonal correlation coefficients based on total”
e1“were 0.25, 0.45, and 0.58 for GCA effects”
Claim · model-written summary
Interseasonal correlation coefficients for SCA effects were 0.64, 0.19 and 0.63 for spring vs. summer, spring vs. fall and summer vs. fall.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- Interseasonal correlation coefficientse0
- Value
- 0.64, 0.19, and 0.63e1
- Qualifier
- SCA effectse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“Interseasonal correlation coefficients based on total”
e1“and 0.64, 0.19, and 0.63 for SCA effects”
Claim · model-written summary
Interannual correlation coefficients of GCA effects based on annual yields in consecutive years were -0.16, 0.45 and 0.65.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- Interannual correlation coefficientse0
- Value
- − 0.16, 0.45, 0.65e1
- Qualifier
- GCA effectse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“Interannual correlation coefficients based on annual yields in consecutive years”
e1“were − 0.16, 0.45, 0.65 for GCA effects and 0.42, 0.38, and − 0.18 for SCA effects”
Claim · model-written summary
Interannual correlation coefficients of SCA effects based on annual yields in consecutive years were 0.42, 0.38 and -0.18.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- Interannual correlation coefficientse0
- Value
- 0.42, 0.38, and − 0.18e1
- Qualifier
- SCA effectse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“Interannual correlation coefficients based on annual yields in consecutive years”
e1“were − 0.16, 0.45, 0.65 for GCA effects and 0.42, 0.38, and − 0.18 for SCA effects”
Claim · model-written summary
The data suggested an annual recurrence of relative seasonal magnitudes of GCA and SCA.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- annual recurrence of relative seasonal magnitudes of GCA and SCAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“an annual recurrence of relative seasonal magnitudes of GCA and SCA”
Claim · model-written summary
Interannual stability of GCA increased as the orchardgrass stand aged.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- interannual stabilitye0
- Direction
- increasinge0
- Qualifier
- as the stand agede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“interannual stability increasing for GCA and decreasing for SCA as the stand aged”
Claim · model-written summary
Interannual stability of SCA decreased as the orchardgrass stand aged.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- interannual stabilitye0
- Direction
- decreasinge0
- Qualifier
- as the stand agede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“interannual stability increasing for GCA and decreasing for SCA as the stand aged”
Claim · model-written summary
Selection for forage production based on GCA would probably be most effective on a seasonal basis in the 3rd year after seeding.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- Most effective selection for forage productione0
- Qualifier
- seasonal basis in the 3rd year after seedinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“Most effective selection for forage production based on GCA probably would be on a seasonal basis in the 3rd year after seeding”
Claim · model-written summary
Selection based on SCA appears questionable, although it might succeed for initial spring production.
- Taxon
- OrchardgrassDactylis glomeratat0
- Outcome
- Selection based on SCAe0
- Qualifier
- initial spring productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Orchardgrass”
e0“Selection based on SCA appears questionable, although it might be successful for initial spring production”