Abstract
High germination seed lots of purple coneflower [ Echinacea purpurea (L.) Moench] were evaluated for laboratory germination following osmotic priming or chilling stratification. Compared to nontreated seeds, osmotic priming at 25C in salts (KNO 3 + K 3 PO 4 ; 1:1, w/w) or polyethylene glycol 4000 (PEG) increased early (3-day) germination percentage at 27C of all seed lots, and improved total (10-day) germination percentage of low-germination seed lots. Total germination percentage was unaffected or increased by priming for 4 days compared to 8 days, and by priming at –1.0 MPa compared to –0.5 MPa (except for one low-germination seed lot). Chilling stratification in water at 5 or 10C increased early and total germination of all seed lots, except for that same lot, compared to nontreated seeds. Total germination percentage was unaffected or increased by stratification at 10C rather than at 5C. Neither extending stratification ≥20 days nor lowering osmotic potential with PEG during stratification improved total germination percentage.
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Claims 9
Claim · model-written summary
Salt priming increased early germination in all seed lots.
- Taxon
- purple coneflowert0
- Treatment
- osmotic priming at 25C in salts (KNO 3 + K 3 PO 4 ; 1:1, w/w)e0
- Outcome
- early (3-day) germination percentagee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“osmotic priming at 25C in salts (KNO 3 + K 3 PO 4 ; 1:1, w/w) or polyethylene glycol 4000 (PEG) increased early (3-day) germination percentage at 27C of all seed lots”
t0“purple coneflower”
Claim · model-written summary
PEG priming increased early germination in all seed lots.
- Taxon
- purple coneflowert0
- Treatment
- polyethylene glycol 4000 (PEG)e0
- Outcome
- early (3-day) germination percentagee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“polyethylene glycol 4000 (PEG) increased early (3-day) germination percentage at 27C of all seed lots”
t0“purple coneflower”
Claim · model-written summary
Priming improved total germination of low-germination lots.
Not reportedTreatmentComparator
Verbatim
e0“improved total (10-day) germination percentage of low-germination seed lots”
t0“purple coneflower”
Claim · model-written summary
Four days of priming gave unchanged or increased total germination relative to eight days.
Verbatim
e0“Total germination percentage was unaffected or increased by priming for 4 days compared to 8 days”
t0“purple coneflower”
Claim · model-written summary
Priming at –1.0 MPa gave unchanged or increased total germination relative to –0.5 MPa, with an exception.
Verbatim
e0“Total germination percentage was unaffected or increased by priming for 4 days compared to 8 days, and by priming at –1.0 MPa compared to –0.5 MPa (except for one low-germination seed lot)”
t0“purple coneflower”
Claim · model-written summary
Chilling at 5 or 10C increased early and total germination except in one lot.
Verbatim
e0“Chilling stratification in water at 5 or 10C increased early and total germination of all seed lots, except for that same lot, compared to nontreated seeds”
t0“purple coneflower”
Claim · model-written summary
Stratification at 10C gave unchanged or increased total germination relative to 5C.
Verbatim
e0“Total germination percentage was unaffected or increased by stratification at 10C rather than at 5C”
t0“purple coneflower”
Claim · model-written summary
Extending stratification did not improve total germination.
- Taxon
- purple coneflowert0
- Treatment
- extending stratification ≥20 dayse0
- Outcome
- total germination percentagee0
- Direction
- Neithere0
Not reportedComparator
Verbatim
e0“Neither extending stratification ≥20 days nor lowering osmotic potential with PEG during stratification improved total germination percentage”
t0“purple coneflower”
Claim · model-written summary
Lowering osmotic potential with PEG during stratification did not improve total germination.
- Taxon
- purple coneflowert0
- Treatment
- lowering osmotic potential with PEG during stratificatione0
- Outcome
- total germination percentagee0
- Direction
- Neithere0
Not reportedComparator
Verbatim
e0“Neither extending stratification ≥20 days nor lowering osmotic potential with PEG during stratification improved total germination percentage”
t0“purple coneflower”