Abstract
Water saving technologies without reduction on grain yield, like alternate wetting and drying (AWD), have been implemented successfully in irrigated rice fields. It is now needed to identify key crop traits under more pronounced water constraint for genetic improvement and further increase in water productivity. Five contrasted genotypes were grown under three water treatments in 2006 (AWD30 with irrigation set up whenever soil water potential reached -30 kPa at 15 cm deep, AWD60, and CF as continuous flooding) while nine genotypes were grown under two water treatments in 2008 (AWD30 and CF). While water use decreased significantly for all genotypes by 29% to 37% under AWD30 and by 22% to 34% under AWD60 in 2006DS, and by 17% to 25% in 2008DS, grain yield was maintained only in rare cases which expressed high contrast among genotypes' responses: grain yield of PSBRc80 was maintained in all situations while that of IR64 was significantly and systematically affected. The response of yield components to AWD was, however, not consistent with regard to the performance: cases with stable grain yield included some with unaffected yield components (three genotypes) and others with compensation between panicle number and filled grain number per panicle (PSBRc80). Cases with reduced grain yield included some with reduced grain size (two genotypes including IR64) and others with reduced filled grain number per panicle (two genotypes). Tiller emergence rate and maximum tillering increased under AWD for all genotypes, however, effect on LAI and biomass accumulation was inconsistent. Partitioning to culm was favored under AWD to the detriment of blade during the reproductive phase of the most adapted genotypes in 2008 although this was not reported in 2006. Under CF, the root/shoot ratio, total root dry matter and root dry matter below 25 cm deep were consistently higher, but for the most three adapted genotypes only. As a response to AWD, the root/shoot ratio and total root dry matter of these genotypes were maintained (in 2006) or even increased (in 2008) while those of a genotype bred for aerobic conditions were rather low under CF, but its partitioning to root dry matter at deep layers increased strongly under AWD. Although the plant type and traits responsible to AWD adaptation were not clearly consistent among the promising genotypes under study, the size, distribution and adaptation of the rooting system were clearly identified as key crop traits for adaptation to alternate wetting and drying. (Texte intégral)
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 20
Claim · model-written summary
Under AWD30 in the 2006 dry season, water use decreased significantly by 29% to 37% across all genotypes.
- Taxon
- rice
Oryza sativat0 - Material
- all genotypese2
- Treatment
- AWD30e2
- Outcome
- water usee2
- Direction
- decreasede2
- Value
- 29% to 37%e2
- Setting
- 2006DSe2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e2“water use decreased significantly for all genotypes by 29% to 37% under AWD30 and by 22% to 34% under AWD60 in 2006DS”
Claim · model-written summary
Under AWD60 in the 2006 dry season, water use decreased significantly by 22% to 34% across all genotypes.
- Taxon
- riceOryza sativat0
- Material
- all genotypese2
- Treatment
- AWD60e2
- Outcome
- water usee2
- Direction
- decreasede2
- Value
- 22% to 34%e2
- Setting
- 2006DSe2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e2“water use decreased significantly for all genotypes by 29% to 37% under AWD30 and by 22% to 34% under AWD60 in 2006DS”
Claim · model-written summary
In the 2008 dry season, water use decreased by 17% to 25% across genotypes.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e2“water use decreased significantly for all genotypes by 29% to 37% under AWD30 and by 22% to 34% under AWD60 in 2006DS”
e3“by 17% to 25% in 2008DS”
Claim · model-written summary
Grain yield was maintained only in rare cases showing high contrast among genotypes responses.
- Taxon
- riceOryza sativat0
- Outcome
- grain yielde4
- Direction
- maintainede4
- Qualifier
- only in rare casese4
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e4“grain yield was maintained only in rare cases which expressed high contrast among genotypes' responses”
Claim · model-written summary
Grain yield of PSBRc80 was maintained in all situations.
- Taxon
- riceOryza sativat0
- Material
- PSBRc80e5
- Outcome
- grain yielde5
- Direction
- maintainede5
- Qualifier
- in all situationse5
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e5“grain yield of PSBRc80 was maintained in all situations while that of IR64 was significantly and systematically affected”
Claim · model-written summary
Grain yield of IR64 was significantly and systematically affected under the water treatments.
- Taxon
- riceOryza sativat0
- Material
- IR64e5
- Outcome
- grain yielde5
- Qualifier
- significantly and systematicallye5
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e5“grain yield of PSBRc80 was maintained in all situations while that of IR64 was significantly and systematically affected”
Claim · model-written summary
Tiller emergence rate increased under AWD in all genotypes.
- Taxon
- riceOryza sativat0
- Material
- all genotypese6
- Treatment
- AWDe6
- Outcome
- Tiller emergence ratee6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e6“Tiller emergence rate and maximum tillering increased under AWD for all genotypes”
Claim · model-written summary
Maximum tillering increased under AWD in all genotypes.
- Taxon
- riceOryza sativat0
- Material
- all genotypese6
- Treatment
- AWDe6
- Outcome
- maximum tilleringe6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e6“Tiller emergence rate and maximum tillering increased under AWD for all genotypes”
Claim · model-written summary
The effect of AWD on LAI and biomass accumulation was inconsistent.
- Taxon
- riceOryza sativat0
- Outcome
- LAI and biomass accumulatione7
- Qualifier
- inconsistente7
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e7“effect on LAI and biomass accumulation was inconsistent”
Claim · model-written summary
Partitioning to culm was favored under AWD over blade during the reproductive phase of the most adapted genotypes in 2008.
- Taxon
- riceOryza sativat0
- Organ / stage
- culme1
- Treatment
- AWDe1
- Outcome
- Partitioning to culme1
- Direction
- favorede1
- Qualifier
- during the reproductive phasee1
- Comparator
- bladee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e1“Partitioning to culm was favored under AWD to the detriment of blade during the reproductive phase of the most adapted genotypes in 2008”
Claim · model-written summary
Under CF, root/shoot ratio, total root dry matter and root dry matter below 25 cm were consistently higher, for the three most adapted genotypes only.
- Taxon
- riceOryza sativat0
- Organ / stage
- roote2
- Treatment
- CFe2
- Outcome
- root/shoot ratio, total root dry matter and root dry matter below 25 cm deepe2
- Direction
- highere2
- Qualifier
- for the most three adapted genotypes onlye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e2“Under CF, the root/shoot ratio, total root dry matter and root dry matter below 25 cm deep were consistently higher, but for the most three adapted genotypes only”
Claim · model-written summary
Root/shoot ratio and total root dry matter of these genotypes were maintained under AWD in 2006.
- Taxon
- riceOryza sativat0
- Organ / stage
- roote3
- Treatment
- AWDe3
- Outcome
- the root/shoot ratio and total root dry mattere3
- Direction
- maintainede3
- Setting
- 2006e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e3“As a response to AWD, the root/shoot ratio and total root dry matter of these genotypes were maintained (in 2006) or even increased (in 2008)”
Claim · model-written summary
Root/shoot ratio and total root dry matter of these genotypes increased under AWD in 2008.
- Taxon
- riceOryza sativat0
- Organ / stage
- roote3
- Treatment
- AWDe3
- Outcome
- the root/shoot ratio and total root dry mattere3
- Direction
- increasede3
- Setting
- 2008e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e3“As a response to AWD, the root/shoot ratio and total root dry matter of these genotypes were maintained (in 2006) or even increased (in 2008)”
Claim · model-written summary
The aerobic-bred genotype had rather low root/shoot ratio and total root dry matter under CF.
- Taxon
- riceOryza sativat0
- Material
- a genotype bred for aerobic conditionse4
- Treatment
- CFe4
- Outcome
- root/shoot ratio and total root dry mattere3
- Direction
- rather lowe4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e3“As a response to AWD, the root/shoot ratio and total root dry matter of these genotypes were maintained (in 2006) or even increased (in 2008)”
e4“those of a genotype bred for aerobic conditions were rather low under CF, but its partitioning to root dry matter at deep layers increased strongly under AWD”
Claim · model-written summary
Partitioning to root dry matter at deep layers of the aerobic-bred genotype increased strongly under AWD.
- Taxon
- riceOryza sativat0
- Material
- a genotype bred for aerobic conditionse4
- Treatment
- AWDe4
- Outcome
- partitioning to root dry matter at deep layerse4
- Direction
- increasede4
- Qualifier
- stronglye4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e4“those of a genotype bred for aerobic conditions were rather low under CF, but its partitioning to root dry matter at deep layers increased strongly under AWD”
Claim · model-written summary
Size and distribution of the rooting system were identified as key crop traits for adaptation to alternate wetting and drying.
- Taxon
- riceOryza sativat0
- Organ / stage
- rooting systeme5
- Outcome
- adaptation to alternate wetting and dryinge5
- Qualifier
- size, distributione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e5“the size, distribution and adaptation of the rooting system were clearly identified as key crop traits for adaptation to alternate wetting and drying”
Claim · model-written summary
PSBRc80 compensated between panicle number and filled grain number per panicle.
- Taxon
- riceOryza sativat0
- Material
- PSBRc80e6
- Outcome
- compensation between panicle number and filled grain number per paniclee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e6“others with compensation between panicle number and filled grain number per panicle (PSBRc80)”
Claim · model-written summary
In cases of reduced grain yield, grain size was reduced in two genotypes including IR64.
- Taxon
- riceOryza sativat0
- Material
- two genotypes including IR64e7
- Outcome
- grain sizee7
- Direction
- reducede7
- Qualifier
- Cases with reduced grain yielde7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e7“Cases with reduced grain yield included some with reduced grain size (two genotypes including IR64) and others with reduced filled grain number per panicle (two genotypes)”
Claim · model-written summary
In cases of reduced grain yield, filled grain number per panicle was reduced in two genotypes.
- Taxon
- riceOryza sativat0
- Material
- two genotypese7
- Outcome
- filled grain number per paniclee7
- Direction
- reducede7
- Qualifier
- Cases with reduced grain yielde7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e7“Cases with reduced grain yield included some with reduced grain size (two genotypes including IR64) and others with reduced filled grain number per panicle (two genotypes)”
Claim · model-written summary
In cases of stable grain yield, yield components were unaffected in three genotypes.
- Taxon
- riceOryza sativat0
- Material
- three genotypese1
- Outcome
- yield componentse1
- Qualifier
- unaffectede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“contrasted rice genotypes”
e1“Cases with stable grain yield included some with unaffected yield components (three genotypes)”
The same questions in other papers
irrigation · growth · Oryza sativa (rice)Positive and negative results
221 papers in the same direction as this paper · 62 in the opposite direction · 7 reporting no difference from an alternative
- negative
- negative
- negative
287 papers more in this group
See all 291 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.