Abstract
Abstract. Elongation responses of intact coleoptiles of rice ( Oryza sativa L. ev. Sasanishiki) explants to various gases were examined under submerged conditions in continuously flowing gas‐saturated incubation media. Reduced O 2 tension (hypoxia). CO 2 and especially C 2 H 4 significantly stimulated coleoptile elongation; the optimal concentrations of O 2 , CO 2 and C 2 H 4 when applied singly were 0.07 m 3 m ‐3 , 0.10 m 3 m ‐3 , and 3 cm 3 , respectively. However, in addition to these gases other as yet unknown factors were involved in the enhanced elongation of rice coleoptiles under water. The actions of CO 2 and C 2 H 4 , unlike that of hypoxia, were accompanied by increases in dry weight of the coleoptiles. The effect of C 2 H 4 occurred independently of O 2 concentrations, whereas that of CO 2 occurred above 0.08 m 3 m ‐3 O 2 . Maximum elongation of rice coleoptiles under submerged conditions was obtained when the flowing medium was saturated with a gas mixture containing 0.10 m 3 m ‐3 O 2 , 0.10 m 3 m ‐3 CO 2 and 10 cm 3 m ‐3 C 2 H 4 , greatly surpassing elongation in static media. However, elongation in static media was greater than that in a closed atmosphere. The intercellular C 2 H 4 concentration in explants growing in static media was higher than that in a closed atmosphere. These results showed that the coleoptile elongation of rice seedlings under water may be regulated by the accumulation of CO 2 and C 2 H 4 in and around the seedlings under hypoxic conditions.
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Claims 10
Claim · model-written summary
Hypoxia stimulated rice coleoptile elongation.
- Taxon
- rice
Oryza sativae1 - Organ / stage
- coleoptilee0
- Treatment
- Reduced O 2 tension (hypoxia)e0
- Outcome
- coleoptile elongatione0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduced O 2 tension (hypoxia). CO 2 and especially C 2 H 4 significantly stimulated coleoptile elongation”
e1“rice ( Oryza sativa L. ev. Sasanishiki)”
Claim · model-written summary
CO2 stimulated rice coleoptile elongation.
- Taxon
- riceOryza sativae1
- Treatment
- CO 2e0
- Outcome
- coleoptile elongatione0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 and especially C 2 H 4 significantly stimulated coleoptile elongation”
e1“rice ( Oryza sativa L. ev. Sasanishiki)”
Claim · model-written summary
Ethylene especially stimulated rice coleoptile elongation.
- Taxon
- riceOryza sativae1
- Treatment
- C 2 H 4e0
- Outcome
- coleoptile elongatione0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 and especially C 2 H 4 significantly stimulated coleoptile elongation”
e1“rice ( Oryza sativa L. ev. Sasanishiki)”
Claim · model-written summary
Carbon dioxide and ethylene increased coleoptile dry weight.
- Taxon
- riceOryza sativat0
- Treatment
- CO 2 and C 2 H 4e0
- Outcome
- dry weight of the coleoptilese0
- Direction
- increasese0
- Comparator
- hypoxiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The actions of CO 2 and C 2 H 4 , unlike that of hypoxia, were accompanied by increases in dry weight of the coleoptiles”
t0“rice coleoptiles”
Claim · model-written summary
Ethylene effect was independent of oxygen concentration.
- Taxon
- riceOryza sativat0
- Treatment
- C 2 H 4e0
- Outcome
- effect of C 2 H 4e0
- Qualifier
- independently of O 2 concentrationse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of C 2 H 4 occurred independently of O 2 concentrations”
t0“rice coleoptiles”
Claim · model-written summary
Carbon dioxide effect occurred above the specified oxygen concentration.
- Taxon
- riceOryza sativat0
- Outcome
- that of CO 2 occurrede0
- Qualifier
- above 0.08 m 3 m ‐3 O 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that of CO 2 occurred above 0.08 m 3 m ‐3 O 2”
t0“rice coleoptiles”
Claim · model-written summary
The gas mixture produced maximum submerged coleoptile elongation, exceeding static media.
- Taxon
- riceOryza sativae0
- Treatment
- gas mixture containing 0.10 m 3 m ‐3 O 2 , 0.10 m 3 m ‐3 CO 2 and 10 cm 3 m ‐3 C 2 H 4e0
- Outcome
- elongation of rice coleoptilese0
- Direction
- Maximume0
- Comparator
- static mediae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum elongation of rice coleoptiles under submerged conditions was obtained when the flowing medium was saturated with a gas mixture containing 0.10 m 3 m ‐3 O 2 , 0.10 m 3 m ‐3 CO 2 and 10 cm 3 m ‐3 C 2 H 4 , greatly surpassing elongation in static media”
Claim · model-written summary
Static media produced greater elongation than a closed atmosphere.
- Taxon
- riceOryza sativat0
- Treatment
- static mediae0
- Outcome
- elongatione0
- Direction
- greatere0
- Comparator
- a closed atmospheree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elongation in static media was greater than that in a closed atmosphere”
t0“rice coleoptiles”
Claim · model-written summary
Intercellular ethylene was higher in static media than in a closed atmosphere.
- Taxon
- riceOryza sativat0
- Treatment
- static mediae0
- Outcome
- intercellular C 2 H 4 concentratione0
- Direction
- highere0
- Comparator
- a closed atmospheree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intercellular C 2 H 4 concentration in explants growing in static media was higher than that in a closed atmosphere”
t0“rice coleoptiles”
Claim · model-written summary
Accumulated carbon dioxide and ethylene may regulate underwater coleoptile elongation.
- Taxon
- riceOryza sativae0
- Outcome
- coleoptile elongatione0
- Qualifier
- accumulation of CO 2 and C 2 H 4 in and around the seedlings under hypoxic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the coleoptile elongation of rice seedlings under water may be regulated by the accumulation of CO 2 and C 2 H 4 in and around the seedlings under hypoxic conditions”
The same questions in other papers
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- no effect
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See all 124 papers →flooding · growth · Oryza sativa (rice)Positive and negative results
63 papers in the same direction as this paper · 72 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- negative
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See all 138 papers →in vitro · growth · Oryza sativa (rice)Positive and negative results
139 papers in the same direction as this paper · 24 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
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See all 165 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.