Abstract
To demonstrate the seed dormancy and germination characters of Robinia pseudoacacia L., an exotic tall tree species in Japan, we applied scarification, cold stratification, diurnal thermal regime, heat shock, and/or winter weathering treatments to the seeds. These characters differed markedly among three seed sources (Trees K, B, and I). Scarification revealed that most seeds from Tree K showed physical dormancy, whereas those from Tree B had no physical dormancy. The seeds from Tree I showed weak physical dormancy so that the seeds eventually germinate without any treatments as time goes by. The physical dormancy in Tree K was broken by a long, high heat shock treatment. The results imply that seeds from Tree K respond to fire in natural conditions. Seeds from Tree I responded to a wide range of thermal regimes, except for long, high heat shock. In contrast, most seeds from Tree B absorbed water during cold stratification and some germinated. However, many seeds from Tree B died in the soil during the winter, presumably because of microbial and fungal infections. Seeds from Trees I and B acquired physical dormancy by weathering during the winter, implying that seedpods that remain in the crown function as an aerial seed bank. R. pseudoacacia may be able to produce various levels in dormancy with respect to the winter condition.
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Claims 7
Claim · model-written summary
Tree K seeds mostly showed physical dormancy, whereas Tree B seeds did not.
Verbatim
e0“Scarification revealed that most seeds from Tree K showed physical dormancy, whereas those from Tree B had no physical dormancy.”
Claim · model-written summary
Tree I seeds had weak physical dormancy and eventually germinated untreated.
Verbatim
e0“The seeds from Tree I showed weak physical dormancy so that the seeds eventually germinate without any treatments as time goes by.”
Claim · model-written summary
Long high heat shock broke physical dormancy in Tree K seeds.
- Taxon
- Robinia pseudoacaciaL.
Robinia pseudoacaciat0 - Material
- Tree Ke0
- Treatment
- long, high heat shock treatmente0
- Outcome
- physical dormancye0
- Direction
- brokene0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The physical dormancy in Tree K was broken by a long, high heat shock treatment.”
t0“Robinia pseudoacaciaL.”
Claim · model-written summary
Tree I seeds responded across thermal regimes except long high heat shock.
Verbatim
e0“Seeds from Tree I responded to a wide range of thermal regimes, except for long, high heat shock.”
Claim · model-written summary
Most Tree B seeds absorbed water in cold stratification and some germinated.
Not reportedComparatorDirection
Verbatim
e0“most seeds from Tree B absorbed water during cold stratification and some germinated.”
Claim · model-written summary
Many Tree B seeds died in soil during winter, possibly from infections.
Verbatim
e0“many seeds from Tree B died in the soil during the winter, presumably because of microbial and fungal infections.”
Claim · model-written summary
Winter weathering induced physical dormancy in Tree I and B seeds.
- Taxon
- Trees I and Be0
- Treatment
- weathering during the wintere0
- Outcome
- physical dormancye0
- Direction
- acquirede0
Not reportedComparator
Verbatim
e0“Seeds from Trees I and B acquired physical dormancy by weathering during the winter”
The same questions in other papers
heat · growth · Robinia pseudoacacia (black locust)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.