Abstract
Two types of floods can be happen in rice crops, i.e. flash floods and stagnant floods. Flash floods cause complete submergence for up to 2 weeks, while stagnant floods (SF) could partially submerge part of rice plant. To overcome yield loss due to the floods, introgression of SUB1 gene, known as a gene suppressing cell elongation and carbohydrate metabolism, to rice genotype can increase plant tolerance to complete submergence for 10 days or more. The study aimed to evaluate the response of 18 rice genotypes, including the recently developed sixth pair SUB1 near isogenic lines (NILs) of mega-rice varieties (Swarna, Sambha Mahsuri, IR64, TDK1, BR11, and CR1009), to various flooding conditions. The rice genotypes were planted at field ponds at Los Banos, Philippines, in the wet season (WS) of 2009. The treatments were 15 days submergence, SF, SF follows submergence and normal conditions. Each treatment was arranged in completely randomized block design with three replications. The results showed that the SUB1 introgression rice lines had higher survival compared to the non-SUB1 and did not much elongate their shoots during submergence. Nevertheless, under SF the rice genotypes should elongates their shoots to allow restoring contact with the air. SF and SF follows submergence decreased the panicle number, grain number per panicle and panicle fertility. Consequently, the yield declined. It suggests that sensitive genotypes are mostly sourcelimited during grain filling. The SUB1 introgression lines had higher chlorophyll concentration and less depletion in soluble sugar and starch after submergence. Under SF, soluble sugar and starch contents between the SUB1 NILs and non-SUB1 lines were not significantly different. Introgression of the SUB1 into high-yielding varieties improved submergence tolerance without affecting yield potential. The study indicates that introgression of the SUB1 into taller type rice varieties should be done to compensate the effect of suppressed elongation.
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Claims 12
Claim · model-written summary
SUB1 introgression rice lines had higher survival than non-SUB1 lines under submergence.
- Taxon
- rice
Oryza sativat0 - Treatment
- submergencee0
- Gene
- SUB1e0
- Outcome
- survivale0
- Direction
- highere0
- Comparator
- non-SUB1e0
- Setting
- field ponds at Los Banos, Philippinese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e0“The results showed that the SUB1 introgression rice lines had higher survival compared to the non-SUB1 and did not much elongate their shoots during submergence”
e1“The rice genotypes were planted at field ponds at Los Banos, Philippines, in the wet season (WS) of 2009”
Claim · model-written summary
SUB1 introgression rice lines did not much elongate their shoots during submergence.
- Taxon
- riceOryza sativat0
- Treatment
- submergencee0
- Gene
- SUB1e0
- Outcome
- elongate their shootse0
- Direction
- did not much elongatee0
- Setting
- field ponds at Los Banos, Philippinese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e0“The results showed that the SUB1 introgression rice lines had higher survival compared to the non-SUB1 and did not much elongate their shoots during submergence”
e1“The rice genotypes were planted at field ponds at Los Banos, Philippines, in the wet season (WS) of 2009”
Claim · model-written summary
Under stagnant flooding, rice shoots should elongate to restore contact with the air.
- Taxon
- riceOryza sativat0
- Treatment
- SFe2
- Outcome
- elongates their shootse2
- Qualifier
- to allow restoring contact with the aire2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e2“Nevertheless, under SF the rice genotypes should elongates their shoots to allow restoring contact with the air”
Claim · model-written summary
Stagnant flooding and stagnant flooding followed by submergence decreased panicle number, grain number per panicle and panicle fertility.
- Taxon
- riceOryza sativat0
- Treatment
- SF and SF follows submergencee3
- Outcome
- panicle number, grain number per panicle and panicle fertilitye3
- Direction
- decreasede3
- Setting
- field ponds at Los Banos, Philippinese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e3“SF and SF follows submergence decreased the panicle number, grain number per panicle and panicle fertility. Consequently, the yield declined”
e1“The rice genotypes were planted at field ponds at Los Banos, Philippines, in the wet season (WS) of 2009”
Claim · model-written summary
Yield declined under stagnant flooding and stagnant flooding followed by submergence.
- Taxon
- riceOryza sativat0
- Treatment
- SF and SF follows submergencee3
- Outcome
- yielde3
- Direction
- declinede3
- Setting
- field ponds at Los Banos, Philippinese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e3“SF and SF follows submergence decreased the panicle number, grain number per panicle and panicle fertility. Consequently, the yield declined”
e1“The rice genotypes were planted at field ponds at Los Banos, Philippines, in the wet season (WS) of 2009”
Claim · model-written summary
Sensitive genotypes are mostly source-limited during grain filling.
- Taxon
- riceOryza sativat0
- Material
- sensitive genotypese4
- Organ / stage
- grain fillinge4
- Outcome
- mostly sourcelimitede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e4“It suggests that sensitive genotypes are mostly sourcelimited during grain filling”
Claim · model-written summary
SUB1 introgression lines had higher chlorophyll concentration after submergence.
- Taxon
- riceOryza sativat0
- Material
- SUB1 introgression linese5
- Treatment
- after submergencee5
- Outcome
- chlorophyll concentratione5
- Direction
- highere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e5“The SUB1 introgression lines had higher chlorophyll concentration and less depletion in soluble sugar and starch after submergence”
Claim · model-written summary
SUB1 introgression lines had less depletion of soluble sugar and starch after submergence.
- Taxon
- riceOryza sativat0
- Material
- SUB1 introgression linese5
- Treatment
- after submergencee5
- Outcome
- depletion in soluble sugar and starche5
- Direction
- lesse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e5“The SUB1 introgression lines had higher chlorophyll concentration and less depletion in soluble sugar and starch after submergence”
Claim · model-written summary
Under stagnant flooding, soluble sugar and starch contents did not differ between SUB1 NILs and non-SUB1 lines.
- Taxon
- riceOryza sativat0
- Material
- SUB1 NILse6
- Treatment
- Under SFe6
- Outcome
- soluble sugar and starch contentse6
- Direction
- no_changeinferrede6
- Comparator
- non-SUB1 linese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e6“Under SF, soluble sugar and starch contents between the SUB1 NILs and non-SUB1 lines were not significantly different”
Claim · model-written summary
Introgression of SUB1 into high-yielding varieties improved submergence tolerance.
- Taxon
- riceOryza sativat0
- Treatment
- Introgression of the SUB1 into high-yielding varietiese7
- Outcome
- submergence tolerancee7
- Direction
- improvede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e7“Introgression of the SUB1 into high-yielding varieties improved submergence tolerance without affecting yield potential”
Claim · model-written summary
Introgression of SUB1 into high-yielding varieties did not affect yield potential.
- Taxon
- riceOryza sativat0
- Treatment
- Introgression of the SUB1 into high-yielding varietiese7
- Outcome
- yield potentiale7
- Direction
- no_changeinferrede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e7“Introgression of the SUB1 into high-yielding varieties improved submergence tolerance without affecting yield potential”
Claim · model-written summary
SUB1 introgression should be done into taller rice varieties to compensate for suppressed elongation.
- Taxon
- riceOryza sativat0
- Outcome
- introgression of the SUB1 into taller type rice varietiese7
- Qualifier
- to compensate the effect of suppressed elongatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE TO VARIOUS FLOODING CONDITIONS”
e7“The study indicates that introgression of the SUB1 into taller type rice varieties should be done to compensate the effect of suppressed elongation”
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