Abstract
Low seedling emergence rates of some seed lots of genetically elite Eucalyptus globulus Labill have been reported by nursery operators and hypothesized to be caused by high temperature stress. This study has confirmed that germination rate was sensitive to exposure to high temperatures. The optimum temperature for the germination rate of normal seedlings in this species was between 24.8°C and 25.5°C. At 25°C, 96% of seeds produced normal seedlings after 21 days. The cardinal temperatures for development of normal Eucalyptus globulus seedlings were between 9.1°C and 10.5°C at low temperature and between 40.3°C and 41.4°C at high temperature. The optimum temperature for maximum attainment of normal seedlings was between 21.2°C and 24.8°C. Temperatures above 30°C generally delayed commencement of germination, reduced total germination percentage, caused a high proportion of seed death and suppressed the development of normal seedlings. Low temperatures also delayed germination but caused less seed mortality. Despite general consistency in responses there was evidence that seed lots exhibit a differential response to temperature, particularly for normal seedling development at the extremes of temperature tested.
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Claims 13
Claim · model-written summary
Germination rate of Eucalyptus globulus seeds was sensitive to exposure to high temperatures.
- Taxon
- Eucalyptus globulus
Eucalyptus globulust0 - Treatment
- high temperaturese0
- Outcome
- germination ratee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“germination rate was sensitive to exposure to high temperatures”
Claim · model-written summary
The optimum temperature for the germination rate of normal seedlings was between 24.8 and 25.5 C.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Outcome
- optimum temperature for the germination rate of normal seedlingse0
- Value
- between 24.8°C and 25.5°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“The optimum temperature for the germination rate of normal seedlings in this species was between 24.8°C and 25.5°C”
Claim · model-written summary
At 25 C, 96% of seeds produced normal seedlings after 21 days.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Outcome
- seeds produced normal seedlingse0
- Value
- 96%e0
- Qualifier
- At 25°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“At 25°C, 96% of seeds produced normal seedlings after 21 days”
Claim · model-written summary
The low-temperature cardinal temperature for development of normal seedlings was between 9.1 and 10.5 C.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Outcome
- cardinal temperatures for development of normal Eucalyptus globulus seedlingse0
- Value
- between 9.1°C and 10.5°Ce1
- Qualifier
- at low temperaturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“The cardinal temperatures for development of normal Eucalyptus globulus seedlings”
e1“between 9.1°C and 10.5°C at low temperature”
Claim · model-written summary
The high-temperature cardinal temperature for development of normal seedlings was between 40.3 and 41.4 C.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Outcome
- cardinal temperatures for development of normal Eucalyptus globulus seedlingse0
- Value
- between 40.3°C and 41.4°Ce1
- Qualifier
- at high temperaturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“The cardinal temperatures for development of normal Eucalyptus globulus seedlings”
e1“between 40.3°C and 41.4°C at high temperature”
Claim · model-written summary
The optimum temperature for maximum attainment of normal seedlings was between 21.2 and 24.8 C.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Outcome
- optimum temperature for maximum attainment of normal seedlingse0
- Value
- between 21.2°C and 24.8°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“The optimum temperature for maximum attainment of normal seedlings was between 21.2°C and 24.8°C”
Claim · model-written summary
Temperatures above 30 C generally delayed commencement of germination.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Treatment
- Temperatures above 30°Ce0
- Outcome
- commencement of germinatione1
- Direction
- delayede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“Temperatures above 30°C”
e1“delayed commencement of germination”
Claim · model-written summary
Temperatures above 30 C generally reduced total germination percentage.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Treatment
- Temperatures above 30°Ce0
- Outcome
- total germination percentagee1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“Temperatures above 30°C”
e1“reduced total germination percentage”
Claim · model-written summary
Temperatures above 30 C generally caused a high proportion of seed death.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Treatment
- Temperatures above 30°Ce0
- Outcome
- seed deathe1
- Direction
- high proportione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“Temperatures above 30°C”
e1“caused a high proportion of seed death”
Claim · model-written summary
Temperatures above 30 C generally suppressed the development of normal seedlings.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Treatment
- Temperatures above 30°Ce0
- Outcome
- development of normal seedlingse1
- Direction
- suppressede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“Temperatures above 30°C”
e1“suppressed the development of normal seedlings”
Claim · model-written summary
Low temperatures also delayed germination.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Treatment
- Low temperaturese0
- Outcome
- germinatione1
- Direction
- delayede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“Low temperatures”
e1“delayed germination”
Claim · model-written summary
Low temperatures caused less seed mortality than high temperatures.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Treatment
- Low temperaturese0
- Outcome
- seed mortalitye1
- Direction
- lesse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“Low temperatures”
e1“less seed mortality”
Claim · model-written summary
Seed lots exhibited a differential response to temperature, particularly for normal seedling development at temperature extremes.
- Taxon
- Eucalyptus globulusEucalyptus globulust0
- Material
- seed lotse0
- Outcome
- differential response to temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Eucalyptus globulus”
e0“seed lots exhibit a differential response to temperature”
The same questions in other papers
cold · growth · Eucalyptus globulus (blue gum)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
heat · growth · Eucalyptus globulus (blue gum)Results agree
1 paper in the same direction as this paper
- no effect
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.