Abstract
Abstract The growth of rice seedlings ( Oryza satira L.) in the presence of ethylene caused a change in the response to light of coleoptile elongation. In plants grown in air without added ethylene coleoptile elongation was promoted by red, far‐red and yellow‐green light only in very young seedlings; in older plants irradiation inhibited the growth of the coleoptile. The effect of growing plants in the presence of ethylene was to prolong the period during which light promoted coleoptile growth. Elongation of the first internode was inhibited by light whether or not the seedlings were grown in the presence of ethylene. A correlation existed between the growth effect of an irradiation and the initial decay rate of phytochrome which was established by the treatment. Regardless of wave length, light sources whose intensities were adjusted to produce a decay rate of about 10% per hour or less induced a moderate rate of coleoptile elongation which persisted for a relatively long period. Irradiation with red or yellow‐green light of higher intensity which produced a higher rate of phytochrome decay induced a higher rate of coleoptile elongation, but growth stopped after several hours. Other observations, however, showed that one cannot establish a general simple correlation between the rate of elongation of rice coleoptiles under light and the status of measurable phytochrome in the plant.
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Claims 8
Claim · model-written summary
In air without added ethylene, red, far-red and yellow-green light promoted coleoptile elongation only in very young rice seedlings.
- Taxon
- Rice Seedlings
Oryza sativat0 - Organ / stage
- very young seedlingse0
- Treatment
- red, far‐red and yellow‐green lighte0
- Outcome
- coleoptile elongatione0
- Direction
- promotede0
- Comparator
- air without added ethylenee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plants grown in air without added ethylene coleoptile elongation was promoted by red, far‐red and yellow‐green light only in very young seedlings”
t0“Rice Seedlings”
Claim · model-written summary
In older rice seedlings, irradiation inhibited coleoptile growth.
- Taxon
- Rice SeedlingsOryza sativat0
- Organ / stage
- older plantse0
- Treatment
- irradiatione0
- Outcome
- growth of the coleoptilee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in older plants irradiation inhibited the growth of the coleoptile”
t0“Rice Seedlings”
Claim · model-written summary
Ethylene prolonged the period during which light promoted rice coleoptile growth.
- Taxon
- Rice SeedlingsOryza sativat0
- Treatment
- ethylenee0
- Outcome
- period during which light promoted coleoptile growthe0
- Direction
- prolonge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of growing plants in the presence of ethylene was to prolong the period during which light promoted coleoptile growth”
t0“Rice Seedlings”
Claim · model-written summary
Light inhibited first-internode elongation with or without ethylene in rice seedlings.
- Taxon
- Rice SeedlingsOryza sativat0
- Treatment
- lighte0
- Outcome
- Elongation of the first internodee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elongation of the first internode was inhibited by light whether or not the seedlings were grown in the presence of ethylene”
t0“Rice Seedlings”
Claim · model-written summary
Irradiation growth effects correlated with the initial rate of phytochrome decay.
- Taxon
- Rice SeedlingsOryza sativat0
- Gene
- phytochromee0
- Outcome
- growth effect of an irradiatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A correlation existed between the growth effect of an irradiation and the initial decay rate of phytochrome which was established by the treatment”
t0“Rice Seedlings”
Claim · model-written summary
Light set to produce phytochrome decay of about 10% per hour or less induced moderate, sustained coleoptile elongation regardless of wavelength.
- Taxon
- Rice SeedlingsOryza sativat0
- Treatment
- light sources whose intensities were adjusted to produce a decay rate of about 10% per hour or lesse0
- Outcome
- moderate rate of coleoptile elongatione0
- Direction
- inducede0
- Value
- about 10% per hour or lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regardless of wave length, light sources whose intensities were adjusted to produce a decay rate of about 10% per hour or less induced a moderate rate of coleoptile elongation which persisted for a relatively long period”
t0“Rice Seedlings”
Claim · model-written summary
Higher-intensity red or yellow-green light produced faster phytochrome decay and a higher initial rate of coleoptile elongation, but growth stopped after several hours.
- Taxon
- Rice SeedlingsOryza sativat0
- Treatment
- red or yellow‐green light of higher intensitye0
- Gene
- phytochromee0
- Outcome
- rate of coleoptile elongatione0
- Direction
- highere0
- Qualifier
- growth stopped after several hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irradiation with red or yellow‐green light of higher intensity which produced a higher rate of phytochrome decay induced a higher rate of coleoptile elongation, but growth stopped after several hours”
t0“Rice Seedlings”
Claim · model-written summary
Other observations did not support a generally simple relationship between coleoptile elongation rate under light and measurable phytochrome status.
- Taxon
- riceOryza sativae0
- Gene
- phytochromee0
- Outcome
- rate of elongation of rice coleoptiles under lighte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one cannot establish a general simple correlation between the rate of elongation of rice coleoptiles under light and the status of measurable phytochrome in the plant”
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See all 95 papers →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.