Abstract
Aerobic rice is a production system where adapted rice varieties are established via direct seeding in non-puddled, non-flooded, non-saturated fields and grown under conditions similar to upland conditions. On land cultivated continuously with aerobic rice, a yield reduction has been observed. The rice root-knot nematode Meloidogyne graminicola is considered one of the possible causes of these yield reductions. Resistance to and tolerance for M. graminicola are essential traits for aerobic rice cultivars in alleviating this problem. In our study, the host response of nineteen aerobic, seven upland and four lowland rice genotypes which are either being used in the International Rice Research Institute’s aerobic rice breeding programme or already cultivated by farmers in Asia was evaluated under aerobic soil conditions in an outdoor raised-bed experiment. Our study showed a large variation in susceptibility and sensitivity to M. graminicola infection among the rice genotypes examined. Resistance comparable to the resistant reference genotypes included in the experiment (CG14, TOG5674, TOG7235) was not found but in terms of susceptibility, the upland genotype Morobereken may be an interesting less-susceptible genotype. Tolerance was found and in terms of sensitivity, the high yielding aerobic genotype IR78877-208-B-1-2 may be an interesting tolerant genotype. Our study also allowed the identification of rice genotypes that are either highly susceptible or sensitive to M. graminicola infection and of which the cultivation should be discouraged. On average, M. graminicola caused an almost 30% reduction in yield. Excluding the two susceptible and three resistant reference genotypes included in the experiment, most affected was dry-shoot biomass (23.6% reduction) followed by root length, which was more affected than fresh-root weight (19.8 vs. 8%) and grain filling (17.3%), while plant height and the number of spikelets/panicle were less affected (10.2 and 8.1%, respectively). Neither tillering nor the number of panicles/plant were affected.
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Claims 14
Claim · model-written summary
Rice genotypes varied widely in susceptibility and sensitivity to nematode infection.
- Taxon
- rice
Oryza sativat0 - Interactor
- M. graminicolaMeloidogyne graminicolae0pathogen
- Outcome
- susceptibility and sensitivity to M. graminicola infectione0
- Direction
- large variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our study showed a large variation in susceptibility and sensitivity to M. graminicola infection among the rice genotypes examined”
t0“Host response of rice genotypes”
Claim · model-written summary
No tested genotype matched the resistance of reference genotypes CG14, TOG5674 and TOG7235.
- Taxon
- riceOryza sativat0
- Outcome
- Resistance comparable to the resistant reference genotypese0
- Direction
- not founde0
- Comparator
- CG14, TOG5674, TOG7235e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Resistance comparable to the resistant reference genotypes included in the experiment (CG14, TOG5674, TOG7235) was not found”
t0“rice genotypes”
Claim · model-written summary
Morobereken may be a less susceptible genotype.
- Taxon
- riceOryza sativat0
- Material
- Moroberekene0
- Outcome
- less-susceptible genotypee0
- Direction
- less-susceptiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the upland genotype Morobereken may be an interesting less-susceptible genotype”
t0“rice genotypes”
Claim · model-written summary
Tolerance to nematode infection was found among the rice genotypes.
- Taxon
- riceOryza sativat0
- Outcome
- Tolerancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tolerance was found and in terms of sensitivity, the high yielding aerobic genotype IR78877-208-B-1-2 may be an interesting tolerant genotype”
t0“rice genotypes”
Claim · model-written summary
IR78877-208-B-1-2 may be a tolerant genotype.
- Taxon
- riceOryza sativat0
- Material
- IR78877-208-B-1-2e0
- Outcome
- tolerant genotypee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tolerance was found and in terms of sensitivity, the high yielding aerobic genotype IR78877-208-B-1-2 may be an interesting tolerant genotype”
t0“rice genotypes”
Claim · model-written summary
The authors discourage cultivating the highly susceptible or sensitive genotypes.
- Taxon
- riceOryza sativat0
- Interactor
- M. graminicolaMeloidogyne graminicolae0pathogen
- Outcome
- cultivation should be discouragede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice genotypes that are either highly susceptible or sensitive to M. graminicola infection and of which the cultivation should be discouraged”
t0“Host response of rice genotypes”
Claim · model-written summary
Nematode infection reduced rice yield by almost 30% on average.
- Taxon
- riceOryza sativat0
- Treatment
- M. graminicolae0
- Interactor
- M. graminicolaMeloidogyne graminicolae0pathogen
- Outcome
- yielde0
- Direction
- reductione0
- Value
- almost 30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On average, M. graminicola caused an almost 30% reduction in yield”
t0“rice genotypes”
Claim · model-written summary
Nematode infection affected dry-shoot biomass, with a reported magnitude of 23.6%.
- Taxon
- riceOryza sativat0
- Outcome
- dry-shoot biomasse0
- Direction
- reductione0
- Value
- 23.6%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most affected was dry-shoot biomass (23.6% reduction) followed by root length, which was more affected than fresh-root weight (19.8 vs. 8%) and grain filling (17.3%), while plant height and the number of spikelets/panicle were less affected (10.2 and 8.1%, respectively)”
t0“rice genotypes”
Claim · model-written summary
Nematode infection affected root length, with a reported magnitude of 19.8.
- Taxon
- riceOryza sativat0
- Outcome
- root lengthe0
- Direction
- more affectede0
- Value
- 19.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most affected was dry-shoot biomass (23.6% reduction) followed by root length, which was more affected than fresh-root weight (19.8 vs. 8%) and grain filling (17.3%), while plant height and the number of spikelets/panicle were less affected (10.2 and 8.1%, respectively)”
t0“rice genotypes”
Claim · model-written summary
Nematode infection affected fresh-root weight, with a reported magnitude of 8%.
- Taxon
- riceOryza sativat0
- Outcome
- fresh-root weighte0
- Direction
- more affectede0
- Value
- 8%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most affected was dry-shoot biomass (23.6% reduction) followed by root length, which was more affected than fresh-root weight (19.8 vs. 8%) and grain filling (17.3%), while plant height and the number of spikelets/panicle were less affected (10.2 and 8.1%, respectively)”
t0“rice genotypes”
Claim · model-written summary
Nematode infection affected grain filling, with a reported magnitude of 17.3%.
- Taxon
- riceOryza sativat0
- Outcome
- grain fillinge0
- Direction
- more affectede0
- Value
- 17.3%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most affected was dry-shoot biomass (23.6% reduction) followed by root length, which was more affected than fresh-root weight (19.8 vs. 8%) and grain filling (17.3%), while plant height and the number of spikelets/panicle were less affected (10.2 and 8.1%, respectively)”
t0“rice genotypes”
Claim · model-written summary
Nematode infection affected plant height, with a reported magnitude of 10.2.
- Taxon
- riceOryza sativat0
- Outcome
- plant heighte0
- Direction
- less affectede0
- Value
- 10.2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most affected was dry-shoot biomass (23.6% reduction) followed by root length, which was more affected than fresh-root weight (19.8 vs. 8%) and grain filling (17.3%), while plant height and the number of spikelets/panicle were less affected (10.2 and 8.1%, respectively)”
t0“rice genotypes”
Claim · model-written summary
Nematode infection affected number of spikelets/panicle, with a reported magnitude of 8.1%.
- Taxon
- riceOryza sativat0
- Outcome
- number of spikelets/paniclee0
- Direction
- less affectede0
- Value
- 8.1%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most affected was dry-shoot biomass (23.6% reduction) followed by root length, which was more affected than fresh-root weight (19.8 vs. 8%) and grain filling (17.3%), while plant height and the number of spikelets/panicle were less affected (10.2 and 8.1%, respectively)”
t0“rice genotypes”
Claim · model-written summary
Nematode infection did not affect tillering or panicles per plant.
- Taxon
- riceOryza sativat0
- Outcome
- tillering nor the number of panicles/plante0
- Direction
- Neithere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither tillering nor the number of panicles/plant were affected”
t0“rice genotypes”
The same questions in other papers
Meloidogyne graminicola · yield · Oryza sativa (rice)Results agree
5 papers in the same direction as this paper
- negative
- no effect
- negative
2 papers more in this group
See all 6 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.