Abstract
Etiolated whole rice seedlings enclosed in sealed vials produced ethylene at a rate of 0.9 picomole per hour per seedling. When 2-centimeter-long shoots were subdivided into 5-millimeter-long sections, the sections containing the tip of the shoot evolved 37% of the total ethylene with the remaining 63% being produced along a gradient decreasing to the base of the shoot. The tip of the coleoptile also had the highest level of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid and of the ethylene-forming enzyme activity. Ethylene is one of the factors controlling coleoptile elongation. Decapitation of the seedling reduced ethylene evolution to one-third its original level and inhibited coleoptile growth. In short-term experiments, the growth rate of decapitated seedlings was restored to almost that of intact seedlings by application of ethylene at a concentration of 10 microliters per liter. Apart from ethylene, O(2) also participates in the control of coleoptile growth. When rice seedlings were grown in a gas mixture of N(2) and O(2), the length of the coleoptiles reached a maximum at a concentration of 2.5% O(2). Lower and higher concentrations of O(2) reduced coleoptile growth. The effect of exogenous ethylene on coleoptile growth was also O(2) dependent.
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Claims 11
Claim · model-written summary
Etiolated rice seedlings produced ethylene at 0.9 picomole per hour per seedling.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- seedlingse0
- Outcome
- ethylenee0
- Value
- 0.9 picomole per hour per seedlinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Etiolated whole rice seedlings enclosed in sealed vials produced ethylene at a rate of 0.9 picomole per hour per seedling.”
Claim · model-written summary
Shoot tip sections evolved 37% of total ethylene, with production decreasing toward the base.
- Taxon
- RiceOryza sativat0
- Organ / stage
- tip of the shoote0
- Outcome
- ethylenee0
- Direction
- decreasinge0
- Value
- 37%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the sections containing the tip of the shoot evolved 37% of the total ethylene with the remaining 63% being produced along a gradient decreasing to the base of the shoot”
t0“Rice Seedlings”
Claim · model-written summary
The coleoptile tip had the highest level of the ethylene precursor.
- Taxon
- RiceOryza sativat0
- Organ / stage
- tip of the coleoptilee0
- Outcome
- level of the ethylene precursor 1-aminocyclopropane-1-carboxylic acide0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tip of the coleoptile also had the highest level of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid”
t0“Rice Seedlings”
Claim · model-written summary
The coleoptile tip had the highest ethylene-forming enzyme activity.
- Taxon
- RiceOryza sativat0
- Organ / stage
- tip of the coleoptilee0
- Outcome
- ethylene-forming enzyme activitye0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tip of the coleoptile also had the highest level of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid and of the ethylene-forming enzyme activity.”
t0“Rice Seedlings”
Claim · model-written summary
Decapitation reduced ethylene evolution to one-third its original level.
- Taxon
- RiceOryza sativat0
- Treatment
- Decapitatione0
- Outcome
- ethylene evolutione0
- Direction
- reducede0
- Value
- one-thirde0
- Comparator
- original levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decapitation of the seedling reduced ethylene evolution to one-third its original level”
t0“Rice Seedlings”
Claim · model-written summary
Decapitation inhibited coleoptile growth.
- Taxon
- RiceOryza sativat0
- Treatment
- Decapitatione0
- Outcome
- coleoptile growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decapitation of the seedling reduced ethylene evolution to one-third its original level and inhibited coleoptile growth.”
t0“Rice Seedlings”
Claim · model-written summary
Ethylene application restored growth rate of decapitated seedlings to almost that of intact seedlings.
- Taxon
- RiceOryza sativat0
- Treatment
- application of ethylene at a concentration of 10 microliters per litere0
- Outcome
- growth ratee0
- Direction
- restorede0
- Comparator
- intact seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the growth rate of decapitated seedlings was restored to almost that of intact seedlings by application of ethylene at a concentration of 10 microliters per liter”
t0“Rice Seedlings”
Claim · model-written summary
Coleoptile length was maximal at 2.5% oxygen.
- Taxon
- RiceOryza sativat0
- Outcome
- length of the coleoptilese0
- Direction
- maximume0
- Value
- 2.5% O(2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the length of the coleoptiles reached a maximum at a concentration of 2.5% O(2)”
t0“Rice Seedlings”
Claim · model-written summary
Oxygen concentrations below 2.5% reduced coleoptile growth.
- Taxon
- RiceOryza sativat0
- Treatment
- Lowere0
- Outcome
- coleoptile growthe0
- Direction
- reducede0
- Comparator
- 2.5% O(2)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower and higher concentrations of O(2) reduced coleoptile growth.”
e1“the length of the coleoptiles reached a maximum at a concentration of 2.5% O(2)”
t0“Rice Seedlings”
Claim · model-written summary
Oxygen concentrations above 2.5% reduced coleoptile growth.
- Taxon
- RiceOryza sativat0
- Treatment
- higher concentrations of O(2)e0
- Outcome
- coleoptile growthe0
- Direction
- reducede0
- Comparator
- 2.5% O(2)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower and higher concentrations of O(2) reduced coleoptile growth.”
e1“the length of the coleoptiles reached a maximum at a concentration of 2.5% O(2)”
t0“Rice Seedlings”
Claim · model-written summary
The effect of exogenous ethylene on coleoptile growth depended on oxygen.
- Taxon
- RiceOryza sativat0
- Treatment
- exogenous ethylenee0
- Outcome
- coleoptile growthe0
- Qualifier
- O(2) dependente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of exogenous ethylene on coleoptile growth was also O(2) dependent.”
t0“Rice Seedlings”
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