Abstract
Continuous recordings were made using a linear displacement transducer to investigate short-term growth responses of intact dark-grown wheat (Triticum aestivum L. cv Maris Huntsman) seedlings to red light. To eliminate any effect of light prior to the experimental treatments, the seedlings were grown and mounted on the transducer apparatus in total darkness. The growth kinetics after irradiation were complex and appeared to consist of three successive phases of growth deceleration. When the tip of the intact coleoptile was irradiated with red light from two opposite fiber bundles (fluence rate: 2 x 64 micromoles per square meter per second) for varying periods of time (10 seconds, 1 minute, 5 minutes, continuous), a decrease in extension rate was detectable after a latent period of 8 to 10 minutes. Up to 30 minutes after the start of the irradiation treatment, there was no difference in the kinetics of inhibition (about 20 to 25% inhibition) between the different lengths of irradiation. Extension rate reached a minimum (65% inhibition) at about 85 minutes, after which growth acceleration toward the dark control rate was observed. Far-red reversibility of the rapid effect of red light on growth was not observed, even when far-red light was given only 4 seconds after the end of 10 seconds red light. Short (15 seconds) far-red light did not induce a response.
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Claims 6
Claim · model-written summary
Red-light irradiation of the coleoptile tip decreased extension rate after a latent period of 8 to 10 minutes, relative to the dark control.
- Taxon
- Triticum aestivum
Triticum aestivume0 - Material
- Maris Huntsmane0
- Organ / stage
- the tip of the intact coleoptilee1
- Treatment
- red lighte1
- Outcome
- extension ratee1
- Direction
- decreasee1
- Qualifier
- after a latent period of 8 to 10 minutese1
- Comparator
- dark controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intact dark-grown wheat (Triticum aestivum L. cv Maris Huntsman) seedlings”
e1“When the tip of the intact coleoptile was irradiated with red light from two opposite fiber bundles (fluence rate: 2 x 64 micromoles per square meter per second) for varying periods of time (10 seconds, 1 minute, 5 minutes, continuous), a decrease in extension rate was detectable after a latent period of 8 to 10 minutes”
e3“Extension rate reached a minimum (65% inhibition) at about 85 minutes, after which growth acceleration toward the dark control rate was observed”
Claim · model-written summary
Up to 30 minutes of red irradiation gave no difference in inhibition kinetics (about 20 to 25%) between irradiation lengths.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- irradiatione2
- Outcome
- kinetics of inhibitione2
- Direction
- no differencee2
- Value
- 20 to 25%e2
- Qualifier
- Up to 30 minutese2
- Comparator
- different lengths of irradiatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intact dark-grown wheat (Triticum aestivum L. cv Maris Huntsman) seedlings”
e2“Up to 30 minutes after the start of the irradiation treatment, there was no difference in the kinetics of inhibition (about 20 to 25% inhibition) between the different lengths of irradiation”
Claim · model-written summary
Extension rate reached a minimum of 65% inhibition at about 85 minutes after red light.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- red lighte1
- Outcome
- extension ratee3
- Direction
- minimume3
- Value
- 65% inhibitione3
- Qualifier
- at about 85 minutese3
- Comparator
- dark controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intact dark-grown wheat (Triticum aestivum L. cv Maris Huntsman) seedlings”
e1“When the tip of the intact coleoptile was irradiated with red light from two opposite fiber bundles (fluence rate: 2 x 64 micromoles per square meter per second) for varying periods of time (10 seconds, 1 minute, 5 minutes, continuous), a decrease in extension rate was detectable after a latent period of 8 to 10 minutes”
e3“Extension rate reached a minimum (65% inhibition) at about 85 minutes, after which growth acceleration toward the dark control rate was observed”
Claim · model-written summary
After about 85 minutes, growth accelerated toward the dark control rate after red light.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- red lighte1
- Outcome
- growthe3
- Direction
- acceleratione3
- Comparator
- dark control ratee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intact dark-grown wheat (Triticum aestivum L. cv Maris Huntsman) seedlings”
e1“When the tip of the intact coleoptile was irradiated with red light from two opposite fiber bundles (fluence rate: 2 x 64 micromoles per square meter per second) for varying periods of time (10 seconds, 1 minute, 5 minutes, continuous), a decrease in extension rate was detectable after a latent period of 8 to 10 minutes”
e3“Extension rate reached a minimum (65% inhibition) at about 85 minutes, after which growth acceleration toward the dark control rate was observed”
Claim · model-written summary
Far-red light did not reverse the rapid effect of red light on growth, even when given 4 seconds after red light.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- far-red lighte4
- Outcome
- Far-red reversibility of the rapid effect of red light on growthe4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intact dark-grown wheat (Triticum aestivum L. cv Maris Huntsman) seedlings”
e4“Far-red reversibility of the rapid effect of red light on growth was not observed, even when far-red light was given only 4 seconds after the end of 10 seconds red light”
Claim · model-written summary
Short (15 seconds) far-red light did not induce a growth response.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- Short (15 seconds) far-red lighte5
- Outcome
- responsee5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intact dark-grown wheat (Triticum aestivum L. cv Maris Huntsman) seedlings”
e5“Short (15 seconds) far-red light did not induce a response”
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