Abstract
High temperature (45°C) inhibits seed germinition and seedling sunflower ( Helianthus annuus L. cv. Mirasol). Treatment of imbibed seeds at 45°C for more than 48 h induces a secondary dormancy, which is associated with progressive decrease of germination ability at optimal temperature (25°C) as well as with abnormal seedling growth. Ethylene (55μl l −1 ) and 2‐chloroethylphosphonic acid (ethephon) (2.5 m M ) improve germination of thermodormant seeds at 25°C. but the abnormal growth of the seedlings remains. O 2 ‐enriched atmosphere and dry storage improve germination and normal seedling growth. The induction of thermodormancy in sunflower seeds seems associated with loss of their ability to convert 1‐aminocyclopropane‐1‐carboxylic acid (ACC) to ethylene. Possible effects of high temperature on membranes and ethylene forming enzyme (EFE) are discussed.
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Claims 9
Claim · model-written summary
High temperature inhibited sunflower seed germination and seedling growth.
- Taxon
- sunflower
Helianthus annuuse0 - Material
- Mirasole0
- Treatment
- High temperature (45°C)e0
- Outcome
- seed germinition and seedling sunflowere0
- Direction
- inhibitse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature (45°C) inhibits seed germinition and seedling sunflower ( Helianthus annuus L. cv. Mirasol).”
Claim · model-written summary
More than 48 hours at 45°C induced secondary dormancy in imbibed sunflower seeds, with progressively reduced germination at 25°C.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- imbibed seedse0
- Treatment
- 45°C for more than 48 he0
- Outcome
- germination abilitye0
- Direction
- progressive decreasee0
- Comparator
- optimal temperature (25°C)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of imbibed seeds at 45°C for more than 48 h induces a secondary dormancy, which is associated with progressive decrease of germination ability at optimal temperature (25°C)”
t0“sunflower seeds”
Claim · model-written summary
Thermal dormancy was associated with abnormal sunflower seedling growth.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- abnormal seedling growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as well as with abnormal seedling growth.”
t0“sunflower seeds”
Claim · model-written summary
Ethylene improved germination of thermodormant sunflower seeds at 25°C.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Ethylene (55μl l −1 )e0
- Outcome
- germination of thermodormant seedse0
- Direction
- improvee0
- Value
- 55μl l −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene (55μl l −1 ) and 2‐chloroethylphosphonic acid (ethephon) (2.5 m M ) improve germination of thermodormant seeds at 25°C.”
t0“sunflower seeds”
Claim · model-written summary
Ethephon improved germination of thermodormant sunflower seeds at 25°C.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- 2‐chloroethylphosphonic acid (ethephon) (2.5 m M )e0
- Outcome
- germination of thermodormant seedse0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene (55μl l −1 ) and 2‐chloroethylphosphonic acid (ethephon) (2.5 m M ) improve germination of thermodormant seeds at 25°C.”
t0“sunflower seeds”
Claim · model-written summary
Abnormal sunflower seedling growth persisted after ethylene or ethephon treatment.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- abnormal growth of the seedlingse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but the abnormal growth of the seedlings remains.”
t0“sunflower seeds”
Claim · model-written summary
An oxygen-enriched atmosphere improved germination and normal seedling growth.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- O 2 ‐enriched atmospheree0
- Outcome
- germination and normal seedling growthe0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“O 2 ‐enriched atmosphere and dry storage improve germination and normal seedling growth.”
t0“sunflower seeds”
Claim · model-written summary
Dry storage improved germination and normal seedling growth.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- dry storagee0
- Outcome
- germination and normal seedling growthe0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“O 2 ‐enriched atmosphere and dry storage improve germination and normal seedling growth.”
t0“sunflower seeds”
Claim · model-written summary
The authors linked sunflower seed thermodormancy to loss of capacity to convert ACC to ethylene.
- Taxon
- sunflowerHelianthus annuuse0
- Compound
- 1‐aminocyclopropane‐1‐carboxylic acid (ACC)e0
- Outcome
- thermodormancye0
- Qualifier
- loss of their ability to convert 1‐aminocyclopropane‐1‐carboxylic acid (ACC) to ethylenee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The induction of thermodormancy in sunflower seeds seems associated with loss of their ability to convert 1‐aminocyclopropane‐1‐carboxylic acid (ACC) to ethylene.”
The same questions in other papers
(2-chloroethyl)phosphonic acid · growth · Helianthus annuus (common sunflower)Positive and negative results
9 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
8 papers more in this group
See all 12 papers →ethene · growth · Helianthus annuus (common sunflower)Results agree
6 papers in the same direction as this paper
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →storage · growth · Helianthus annuus (common sunflower)Positive and negative results
14 papers in the same direction as this paper · 9 in the opposite direction
- positive
- negative
- no effect
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.