Abstract
An attempt has been made to analyze the base response, one of the light growth responses of Avena coleoptiles, by means of growth substance curvatures. The decrease in growth rate (first part of the base response) after exposure to light does not show if hetero-auxin is substituted for auxin-a (Sections 5, 6, and 10). This decreased growth after exposure very likely is due to an oxidative inactivation of auxin-a (Sections 8 and 9). Hetero-auxin can be inactivated too but in a much lesser degree than auxin-a (Section 9). The increase in growth rate following on the decreased growth (second part of the base response) is due to an increase in response of the plant to growth hormone which is independent of the type of hormone (Sections 1, 2, 7, 8, and 10). Under conditions of continuous exposure to light, however, the inactivation of the auxin-a under influence of the light is superimposed on this increased response to growth hormone. This inactivation can be eliminated from the light growth response by replacing the auxin-a by hetero-auxin. More detailed information on this subject can be found in Section 10. A review of the experiments and their results can be obtained from the scheme in Section 8. In Section 11 it is shown that light inhibits the formation of growth hormone in the decapitated coleoptile (regeneration). Very small amounts of light (25 m.c.s.) inhibit the regeneration markedly.
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Claims 7
Claim · model-written summary
Light inhibits the formation of growth hormone in the decapitated Avena coleoptile during regeneration.
- Organ / stage
- decapitated coleoptilee1
- Treatment
- lighte1
- Outcome
- formation of growth hormonee1
- Direction
- inhibitse1
AvenaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AVENA”
e1“In Section 11 it is shown that light inhibits the formation of growth hormone in the decapitated coleoptile (regeneration)”
Claim · model-written summary
Very small amounts of light (25 m.c.s.) markedly inhibit regeneration in Avena coleoptiles.
- Treatment
- very small amounts of light (25 m.c.s.)e2
- Outcome
- regeneratione2
- Direction
- inhibite2
- Qualifier
- markedlye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AVENA”
e2“Very small amounts of light (25 m.c.s.) inhibit the regeneration markedly”
Claim · model-written summary
The decrease in growth rate after light exposure is very likely due to oxidative inactivation of auxin-a.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AVENA”
e4“This decreased growth after exposure very likely is due to an oxidative inactivation of auxin-a”
Claim · model-written summary
The increase in growth rate after the decrease is due to increased response to growth hormone, independent of hormone type.
- Compound
- growth hormonee5
- Outcome
- increase in growth ratee5
- Qualifier
- independent of the type of hormonee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AVENA”
e5“The increase in growth rate following on the decreased growth (second part of the base response) is due to an increase in response of the plant to growth hormone which is independent of the type of hormone”
Claim · model-written summary
Hetero-auxin is inactivated to a much lesser degree than auxin-a.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AVENA”
e6“Hetero-auxin can be inactivated too but in a much lesser degree than auxin-a”
Claim · model-written summary
Replacing auxin-a by hetero-auxin eliminates the inactivation from the light growth response.
- Treatment
- replacing the auxin-a by hetero-auxine7
- Outcome
- inactivatione7
- Direction
- eliminatede7
- Comparator
- auxin-ae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AVENA”
e7“This inactivation can be eliminated from the light growth response by replacing the auxin-a by hetero-auxin”
Claim · model-written summary
Substituting hetero-auxin for auxin-a does not show the decrease in growth rate after light exposure.
- Treatment
- hetero-auxin is substituted for auxin-ae3
- Outcome
- decrease in growth ratee3
- Qualifier
- does not showe3
- Comparator
- auxin-ae3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AVENA”
e3“The decrease in growth rate (first part of the base response) after exposure to light does not show if hetero-auxin is substituted for auxin-a”