Abstract
SUMMARY The effects on radicle development and seedling emergence of cold storing batches of pre‐germinated lettuce seeds for up to 7 days at 0 or 2 °C were investigated in three experiments. Cold storage tended to delay emergence and increase its spread in time. Separate batches of pre‐germinated seeds gave different mean radicle lengths and different patterns of emergence and it is likely that small differences in mean temperature during germination were responsible since the length of radicles after germination was linearly related to accumulated day‐degrees during the germination period. This suggests that germinating seeds over a period during which a required number of day‐degrees is accumulated may produce radicles of the same length for different sowings. The elongation of radicles during cold storage was also linearly related to accumulated day‐degrees. At 2 °C it appeared that the longer radicles elongated faster than the smaller ones and this may account for cold storage tending to increase the spread of seedling emergence when the pre‐germinated seeds were sown into compost.
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Claims 6
Claim · model-written summary
Cold storage tended to delay lettuce seedling emergence.
Not reportedTaxonComparator
Verbatim
e0“Cold storage tended to delay emergence and increase its spread in time.”
Claim · model-written summary
Cold storage tended to increase the spread of emergence times.
Not reportedTaxonComparator
Verbatim
e0“Cold storage tended to delay emergence and increase its spread in time.”
Claim · model-written summary
Seed batches differed in radicle length and emergence patterns.
- Material
- Separate batches of pre‐germinated seedse0
- Outcome
- mean radicle lengths and different patterns of emergencee0
- Direction
- differente0
Not reportedTaxon
Verbatim
e0“Separate batches of pre‐germinated seeds gave different mean radicle lengths and different patterns of emergence”
Claim · model-written summary
Post-germination radicle length was linearly related to accumulated thermal time.
Not reportedTaxon
Verbatim
e0“the length of radicles after germination was linearly related to accumulated day‐degrees during the germination period.”
Claim · model-written summary
Radicle elongation during storage was linearly related to accumulated thermal time.
Not reportedTaxon
Verbatim
e0“The elongation of radicles during cold storage was also linearly related to accumulated day‐degrees.”
Claim · model-written summary
At 2 °C, longer radicles appeared to elongate faster than smaller radicles.
Not reportedTaxon
Verbatim
e0“At 2 °C it appeared that the longer radicles elongated faster than the smaller ones”