Abstract
An effective dormancy-breaking method may be of interest to wheat (Triticum aestivum L.) breeders selecting for increased seed dormancy prior to advancing their populations in greenhouse grow-outs. The objective of this study was to identify an effective pre-treatment for breaking dormancy in wheat that did not result in seedling etiolation. In 2000, eight dormant (W98616, line 211, EMDR-4, EMDR-9, EMDR-14, RL4137, Columbus, and AC Domain) and one nondormant line (Roblin) were grown at two locations in Saskatchewan. Seeds were: (i) stored for zero to 21 wks at 24°C before incubating at 20°C for 7 d; (ii) incubated at 5, 10, 15, 20, and 25°C for 14 d; and (iii) treated with gibberellic acid (GA 3 ) (0.0006 and 0.0014 M), potassium nitrate (KNO 3 ) (0.01 and 0.02 M), chilling, heating, chilling with 0.01 M KNO 3 , and heating with 0.01 M KNO 3 before incubating at 10°C for 14 d. Seedling growth was observed in a duplicated growth chamber experiment. Seedling length, first inter-node length, and biomass yield data were collected from plants grown from seeds treated with four effective pretreatments. Data were subjected to an ANOVA. Six to 18 weeks of storage at 24°C were required to break the dormancy (≥ 95% germination) in dormant genotypes. Incubation at 10°C was the most effective temperature for promoting germination in dormant seeds after 10d of testing. Four pre-treatments including 0.0006 M GA 3 , 0.0014 M GA 3 , chilling with 0.01 M KNO 3 , and heating with 0.01 M KNO 3 led to ≥ 95% germination within 10 d of testing. Only GA 3 treatments were associated with etiolated seedling growth. Heating with 0.01 M KNO 3 or chilling with 0.01 M KNO 3 , applied before incubating at 10°C in darkness, may be of interest to breeders selecting for increased dormancy before advancing breeding populations in greenhouse grow-outs. Key words: Triticum, dormancy, nitrate, chilling, heating, etiolated seedling
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Claims 9
Claim · model-written summary
Six to 18 weeks of storage at 24°C broke dormancy in dormant wheat genotypes.
- Taxon
- wheat
Triticum aestivumt0 - Material
- dormant genotypese0
- Treatment
- Six to 18 weeks of storage at 24°Ce0
- Outcome
- germinatione0
- Direction
- break the dormancye0
- Value
- ≥ 95%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Six to 18 weeks of storage at 24°C were required to break the dormancy (≥ 95% germination) in dormant genotypes.”
t0“wheat genotypes”
Claim · model-written summary
Incubation at 10°C most effectively promoted germination after 10 days.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Incubation at 10°Ce0
- Outcome
- germinatione0
- Direction
- most effectivee0
- Qualifier
- after 10d of testinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Incubation at 10°C was the most effective temperature for promoting germination in dormant seeds after 10d of testing.”
t0“wheat genotypes”
Claim · model-written summary
0.0006 M GA 3 yielded at least 95% germination within 10 days.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 0.0006 M GA 3e0
- Outcome
- germinatione0
- Direction
- led toe0
- Value
- ≥ 95%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Four pre-treatments including 0.0006 M GA 3 , 0.0014 M GA 3 , chilling with 0.01 M KNO 3 , and heating with 0.01 M KNO 3 led to ≥ 95% germination within 10 d of testing.”
t0“wheat genotypes”
Claim · model-written summary
0.0014 M GA 3 yielded at least 95% germination within 10 days.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 0.0014 M GA 3e0
- Outcome
- germinatione0
- Direction
- led toe0
- Value
- ≥ 95%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Four pre-treatments including 0.0006 M GA 3 , 0.0014 M GA 3 , chilling with 0.01 M KNO 3 , and heating with 0.01 M KNO 3 led to ≥ 95% germination within 10 d of testing.”
t0“wheat genotypes”
Claim · model-written summary
Chilling with 0.01 M KNO 3 yielded at least 95% germination within 10 days.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- chilling with 0.01 M KNO 3e0
- Outcome
- germinatione0
- Direction
- led toe0
- Value
- ≥ 95%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Four pre-treatments including 0.0006 M GA 3 , 0.0014 M GA 3 , chilling with 0.01 M KNO 3 , and heating with 0.01 M KNO 3 led to ≥ 95% germination within 10 d of testing.”
t0“wheat genotypes”
Claim · model-written summary
Heating with 0.01 M KNO 3 yielded at least 95% germination within 10 days.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- heating with 0.01 M KNO 3e0
- Outcome
- germinatione0
- Direction
- led toe0
- Value
- ≥ 95%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Four pre-treatments including 0.0006 M GA 3 , 0.0014 M GA 3 , chilling with 0.01 M KNO 3 , and heating with 0.01 M KNO 3 led to ≥ 95% germination within 10 d of testing.”
t0“wheat genotypes”
Claim · model-written summary
Only GA 3 treatments were associated with etiolated seedling growth.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- GA 3 treatmentse0
- Outcome
- etiolated seedling growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only GA 3 treatments were associated with etiolated seedling growth.”
t0“wheat genotypes”
Claim · model-written summary
The authors propose heating with 0.01 M KNO 3 for breeders selecting dormancy.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Heating with 0.01 M KNO 3e0
- Outcome
- Heating with 0.01 M KNO 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heating with 0.01 M KNO 3 or chilling with 0.01 M KNO 3 , applied before incubating at 10°C in darkness, may be of interest to breeders selecting for increased dormancy before advancing breeding populations in greenhouse grow-outs.”
t0“wheat genotypes”
Claim · model-written summary
The authors propose chilling with 0.01 M KNO 3 for breeders selecting dormancy.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- chilling with 0.01 M KNO 3e0
- Outcome
- chilling with 0.01 M KNO 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heating with 0.01 M KNO 3 or chilling with 0.01 M KNO 3 , applied before incubating at 10°C in darkness, may be of interest to breeders selecting for increased dormancy before advancing breeding populations in greenhouse grow-outs.”
t0“wheat genotypes”
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