Abstract
There is a need to unravel mechanisms controlling elongation and submergence tolerance in rice ( Oryza sativa L.) and to develop technology for improving rice for deepwater regions. Because of the reported involvement of ethylene in stem internode elongation of deepwater rice, we examined the relationship of seedling elongation to ethylene production. Fourteen rice cultivars/breeding lines with widely ranging differences in elongating capacity in deepwater were used in these studies. Ethylene production by intact 20 to 27‐day‐old seedlings was determined by submergence in 122 ✕ 6‐cm glass cylinders and related to leaf blade/sheath elongation. The floating rice, ‘TCA 177’, elongated largely by the leaf sheath supporting the youngest leaf. The elongating capacity of the rice seedling resided in the top two leaf blades and their sheaths. Elongation decreased with the duration of submergence and after 72 h little increase occurred. A 24‐h submergence enhanced the capacity of the seedlings to produce ethylene and the production was highest during the first hour after removal from water. Complete submergence caused greater production of ethylene than partial submergence. The capacity for ethylene production and elongation peaked at 24 to 36 h of complete submergence and then declined. Ethylene production following submergence generally followed the order: floating rice > deepwater rice > elongating modern cultivar > nonelongating modern cultivar. Elongation index correlated well ( r = 0.88**, significant at the 0.01 probability level) with ethylene producing capacity of seedlings in a population of 14 rice cultivars/breeding lines. The results show that ethylene production by young rice seedlings, following complete submergence, is a good measure of their elongating ability.
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Claims 10
Claim · model-written summary
Elongation index correlated positively with ethylene-producing capacity of rice seedlings (r = 0.88).
- Taxon
- rice
Oryza sativat0 - Compound
- ethylenee1
- Outcome
- Elongation indexe1
- Direction
- higherinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Elongation index correlated well ( r = 0.88**, significant at the 0.01 probability level) with ethylene producing capacity of seedlings”
t0“Relationship of Ethylene Production to Elongation in Deepwater Rice”
Claim · model-written summary
Ethylene production following submergence followed the order floating rice > deepwater rice > elongating modern cultivar > nonelongating modern cultivar.
- Taxon
- riceOryza sativat0
- Outcome
- Ethylene production following submergencee1
- Qualifier
- floating rice > deepwater rice > elongating modern cultivar > nonelongating modern cultivare1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Ethylene production following submergence generally followed the order: floating rice > deepwater rice > elongating modern cultivar > nonelongating modern cultivar”
t0“Relationship of Ethylene Production to Elongation in Deepwater Rice”
Claim · model-written summary
Capacity for ethylene production and elongation peaked at 24 to 36 h of complete submergence.
- Taxon
- riceOryza sativat0
- Treatment
- 24 to 36 h of complete submergencee1
- Outcome
- The capacity for ethylene production and elongatione1
- Direction
- peakede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The capacity for ethylene production and elongation peaked at 24 to 36 h of complete submergence”
t0“Relationship of Ethylene Production to Elongation in Deepwater Rice”
Claim · model-written summary
Elongation of rice seedlings decreased with the duration of submergence.
- Taxon
- riceOryza sativat0
- Treatment
- duration of submergencee1
- Outcome
- Elongatione1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Elongation decreased with the duration of submergence”
t0“Relationship of Ethylene Production to Elongation in Deepwater Rice”
Claim · model-written summary
A 24-h submergence enhanced the capacity of rice seedlings to produce ethylene.
- Taxon
- riceOryza sativat0
- Treatment
- submergencee2
- Outcome
- capacity of the seedlings to produce ethylenee1
- Direction
- enhancede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“enhanced the capacity of the seedlings to produce ethylene”
e2“A 24‐h submergence”
t0“Relationship of Ethylene Production to Elongation in Deepwater Rice”
Claim · model-written summary
Complete submergence caused greater ethylene production than partial submergence.
- Taxon
- riceOryza sativat0
- Treatment
- Complete submergencee1
- Outcome
- production of ethylenee1
- Direction
- greatere1
- Comparator
- partial submergencee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Complete submergence caused greater production of ethylene than partial submergence”
t0“Relationship of Ethylene Production to Elongation in Deepwater Rice”
Claim · model-written summary
Ethylene production of rice seedlings was highest during the first hour after removal from water.
- Taxon
- riceOryza sativat0
- Outcome
- productione1
- Qualifier
- during the first hour after removal from watere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the production was highest during the first hour after removal from water”
t0“Relationship of Ethylene Production to Elongation in Deepwater Rice”
Claim · model-written summary
Floating rice TCA 177 elongated largely by its leaf sheath supporting the youngest leaf.
Verbatim
e1“The floating rice, ‘TCA 177’, elongated largely by the leaf sheath supporting the youngest leaf”
t0“Relationship of Ethylene Production to Elongation in Deepwater Rice”
Claim · model-written summary
The elongating capacity of rice seedlings resided in the top two leaf blades and their sheaths.
- Taxon
- riceOryza sativat0
- Organ / stage
- top two leaf blades and their sheathse1
- Outcome
- elongating capacitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The elongating capacity of the rice seedling resided in the top two leaf blades and their sheaths”
t0“Relationship of Ethylene Production to Elongation in Deepwater Rice”
Claim · model-written summary
Ethylene production by young rice seedlings after complete submergence is a good measure of their elongating ability.
- Taxon
- riceOryza sativat0
- Compound
- ethylenee1
- Outcome
- good measure of their elongating abilitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“ethylene production by young rice seedlings, following complete submergence, is a good measure of their elongating ability”
t0“Relationship of Ethylene Production to Elongation in Deepwater Rice”
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