Abstract
The effects of different water regimes on the pathogenicity of Meloidogyne graminicola on six rice cultivars were determined in two soil types in three greenhouse experiments. Two water regimes, simulating continuous flooding and intermittent flooding, were used with five of the cultivars. All cultivars were susceptible to the nematode, but IR72 and IR74 were more tolerant than IR20 and IR29 under intermittent flooding. All were tolerant under continuous flooding. UPLRi-5 was grown under multiple water regimes: no flooding; continuous flooding; flooding starting at maximum tillering, panicle initiation, or booting stage; and flooding from sowing until maximum tillering or booting. In sandy loam soil, M. graminicola reduced stem and leaf dry weight, root dry weight, and grain weight under all water regimes. In clay loam soil, the nematode reduced root weight when the soil was not flooded or flooded only for a short time, from panicle initiation, or booting to maturity, and from sowing to maximum tillering. In clay loam soil, stem and leaf dry weight, as well as grain weight, were reduced by the nematode under all water regimes except continuous flooding or when the soil was flooded from sowing to booting stage. These results indicate that rice cultivar tolerance of M. graminicola varies with water regime and that yield losses due to M. graminicola may be prevented or minimized when the rice crop is flooded early and kept flooded until a late stage of development.
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Claims 8
Claim · model-written summary
All rice cultivars tested were susceptible to Meloidogyne graminicola.
- Taxon
- rice cultivars
Oryza sativae0 - Interactor
- Meloidogyne graminicolaMeloidogyne graminicolae0pathogen
- Outcome
- susceptible to the nematodee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of different water regimes on the pathogenicity of Meloidogyne graminicola on six rice cultivars”
e1“All cultivars were susceptible to the nematode”
Claim · model-written summary
IR72 and IR74 were more tolerant of Meloidogyne graminicola than IR20 and IR29 under intermittent flooding.
- Taxon
- rice cultivarsOryza sativae0
- Material
- IR72 and IR74e2
- Treatment
- intermittent floodinge2
- Interactor
- Meloidogyne graminicolaMeloidogyne graminicolae0pathogen
- Outcome
- tolerante2
- Direction
- more tolerante2
- Comparator
- IR20 and IR29e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of different water regimes on the pathogenicity of Meloidogyne graminicola on six rice cultivars”
e2“IR72 and IR74 were more tolerant than IR20 and IR29 under intermittent flooding”
Claim · model-written summary
All rice cultivars were tolerant of Meloidogyne graminicola under continuous flooding.
- Taxon
- rice cultivarsOryza sativae0
- Treatment
- continuous floodinge3
- Interactor
- Meloidogyne graminicolaMeloidogyne graminicolae0pathogen
- Outcome
- tolerante3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of different water regimes on the pathogenicity of Meloidogyne graminicola on six rice cultivars”
e3“All were tolerant under continuous flooding”
Claim · model-written summary
Meloidogyne graminicola reduced stem and leaf dry weight, root dry weight and grain weight of rice in sandy loam soil under all water regimes.
- Taxon
- rice cultivarsOryza sativae0
- Treatment
- M. graminicolae4
- Interactor
- M. graminicolaMeloidogyne graminicolae4pathogen
- Outcome
- stem and leaf dry weight, root dry weight, and grain weighte4
- Direction
- reducede4
- Qualifier
- under all water regimese4
- Setting
- sandy loam soile4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of different water regimes on the pathogenicity of Meloidogyne graminicola on six rice cultivars”
e4“In sandy loam soil, M. graminicola reduced stem and leaf dry weight, root dry weight, and grain weight under all water regimes”
Claim · model-written summary
The nematode reduced rice root weight in clay loam soil when the soil was not flooded or flooded only briefly or at later stages.
- Taxon
- rice cultivarsOryza sativae0
- Treatment
- the nematodee5
- Interactor
- Meloidogyne graminicolaMeloidogyne graminicolae0pathogen
- Outcome
- root weighte5
- Direction
- reducede5
- Qualifier
- when the soil was not flooded or flooded only for a short timee5
- Setting
- clay loam soile5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of different water regimes on the pathogenicity of Meloidogyne graminicola on six rice cultivars”
e5“In clay loam soil, the nematode reduced root weight when the soil was not flooded or flooded only for a short time, from panicle initiation, or booting to maturity, and from sowing to maximum tillering”
Claim · model-written summary
In clay loam soil the nematode reduced stem and leaf dry weight and grain weight under most water regimes, except continuous flooding or flooding from sowing to booting.
- Taxon
- rice cultivarsOryza sativae0
- Treatment
- the nematodee6
- Interactor
- Meloidogyne graminicolaMeloidogyne graminicolae0pathogen
- Outcome
- stem and leaf dry weight, as well as grain weighte6
- Direction
- reducede6
- Qualifier
- except continuous flooding or when the soil was flooded from sowing to booting stagee6
- Setting
- clay loam soile6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of different water regimes on the pathogenicity of Meloidogyne graminicola on six rice cultivars”
e6“In clay loam soil, stem and leaf dry weight, as well as grain weight, were reduced by the nematode under all water regimes except continuous flooding or when the soil was flooded from sowing to booting stage”
Claim · model-written summary
Rice cultivar tolerance of Meloidogyne graminicola varies with water regime.
- Taxon
- rice cultivarOryza sativae7
- Treatment
- water regimee7
- Interactor
- M. graminicolaMeloidogyne graminicolae7pathogen
- Outcome
- rice cultivar tolerancee7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“These results indicate that rice cultivar tolerance of M. graminicola varies with water regime”
Claim · model-written summary
Yield losses due to Meloidogyne graminicola may be prevented or minimized by flooding the rice crop early and keeping it flooded until a late stage of development.
- Taxon
- rice cropOryza sativae1
- Treatment
- flooded early and kept flooded until a late stage of developmente1
- Interactor
- M. graminicolaMeloidogyne graminicolae1pathogen
- Outcome
- yield losses due to M. graminicolae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“yield losses due to M. graminicola may be prevented or minimized when the rice crop is flooded early and kept flooded until a late stage of development”
The same questions in other papers
Meloidogyne graminicola · yield · Oryza sativa (rice)Results agree
5 papers in the same direction as this paper
- negative
- negative
- no effect
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.