Abstract
Abstract Cotyledon length in onion ( Allium cepa , cv. White Lisbon) was linearly related to time from radicle emergence until the formation of the cotyledon hook, but thereafter increased exponentially with time. Within each phase the rate of cotyledon elongation was linearly related to temperature, and these relations were similar among seeds from several percentiles of the germinating populations of three contrasting seed lots. The mean base temperature was 1.4°C. These thermal time relations closely predicted the elongation of cotyledons of seedlings from cohorts of early- and lategerminators from a further lot of this cultivar at two suboptimal temperatures. Eleven cohorts of seedlings from seeds of differing quality were transplanted to the field on both the same date and at the same time from visible germination. The plants were harvested 59 days later. No effect of seed quality on mean plant weight, mean bulb diameter, or interplant variation in bulb diameter was detected. It is concluded that the rate of pre- and post-emergence seedling growth in onion is independent of environmentally induced differences in seed quality (seed vigour). Thus, any effect of this factor on plant size or crop yield, at a given density, is solely a function of time to germinate.
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Claims 8
Claim · model-written summary
Onion cotyledon length was linearly related to time until hook formation and then rose exponentially.
- Taxon
- onion
Allium cepae0 - Material
- White Lisbone0
- Organ / stage
- Cotyledone0
- Outcome
- Cotyledon lengthe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotyledon length in onion ( Allium cepa , cv. White Lisbon) was linearly related to time from radicle emergence until the formation of the cotyledon hook, but thereafter increased exponentially with time”
Claim · model-written summary
Cotyledon elongation rate was linearly related to temperature in both phases.
- Taxon
- onionAllium cepae1
- Treatment
- temperaturee0
- Outcome
- rate of cotyledon elongatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within each phase the rate of cotyledon elongation was linearly related to temperature”
e1“Cotyledon length in onion ( Allium cepa , cv. White Lisbon)”
Claim · model-written summary
The temperature relations were similar across germination percentiles of three seed lots.
- Taxon
- onionAllium cepae1
- Material
- three contrasting seed lotse0
- Outcome
- these relations were similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these relations were similar among seeds from several percentiles of the germinating populations of three contrasting seed lots”
e1“Cotyledon length in onion ( Allium cepa , cv. White Lisbon)”
Claim · model-written summary
Mean base temperature was 1.4°C.
- Taxon
- onionAllium cepae1
- Outcome
- mean base temperaturee0
- Value
- 1.4°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean base temperature was 1.4°C”
e1“Cotyledon length in onion ( Allium cepa , cv. White Lisbon)”
Claim · model-written summary
Thermal time relations closely predicted cotyledon elongation at two suboptimal temperatures.
- Taxon
- onionAllium cepae1
- Outcome
- closely predicted the elongation of cotyledonse0
- Value
- two suboptimal temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These thermal time relations closely predicted the elongation of cotyledons of seedlings from cohorts of early- and lategerminators from a further lot of this cultivar at two suboptimal temperatures”
e1“Cotyledon length in onion ( Allium cepa , cv. White Lisbon)”
Claim · model-written summary
Seed quality had no detected effect on mean plant weight, mean bulb diameter, or variation in bulb diameter.
- Taxon
- onionAllium cepae1
- Material
- seed qualitye0
- Outcome
- mean plant weight, mean bulb diameter, or interplant variation in bulb diametere0
- Direction
- No effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No effect of seed quality on mean plant weight, mean bulb diameter, or interplant variation in bulb diameter was detected”
e1“Cotyledon length in onion ( Allium cepa , cv. White Lisbon)”
Claim · model-written summary
The authors conclude that onion seedling growth rate is independent of environmentally induced seed vigour differences.
- Taxon
- onionAllium cepae0
- Outcome
- rate of pre- and post-emergence seedling growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of pre- and post-emergence seedling growth in onion is independent of environmentally induced differences in seed quality (seed vigour)”
Claim · model-written summary
Any seed vigour effect on plant size or crop yield at a given density is attributed to time to germinate.
- Taxon
- onionAllium cepae1
- Outcome
- plant size or crop yielde0
- Qualifier
- time to germinatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“any effect of this factor on plant size or crop yield, at a given density, is solely a function of time to germinate”
e1“seedling growth in onion”