Abstract
The rice water weevil, Oryzophagus oryzae (Coleoptera: Curculionidae), is an economically important pest of flooded rice paddies throughout South America, and species with similar life histories are present in many rice-producing regions globally (collectively referred to here as RWWs). Plant resistance is a key strategy for management of RWWs; however, the mechanisms responsible for rice resistance to RWWs are poorly understood. We investigated morphoanatomical and biochemical plant traits potentially involved in rice resistance to O. oryzae. Resistance-associated traits were characterized in two cultivars, 'Dawn' (resistant) and 'BRS Pampa CL' ('Pamp' = susceptible), which were selected from among six cultivars on 2-year field screenings. Anatomical and morphological traits of leaf tissues from 'Pamp' and 'Dawn' were similar, which perhaps explains the lack of antixenosis during host plant selection. However, significant antibiosis effects were found. The activities of antioxidant enzymes involved in plant defense, as well the content of hydroxycinnamic and hydroxybenzoic acids derivatives and lignin, were higher in roots of 'Dawn' than in 'Pamp', over the period of larval infestation in the field. Additionally, 'Dawn' exhibited a root sclerenchyma arranged in three layers of lignified cells, which differed from the arrangement of cells in 'Pamp', regardless of larval infestation. Our results provide the first evidence for specific resistance-related traits associated with mortality and malnutrition of RWWs in rice.
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Claims 7
Claim · model-written summary
Dawn and Pamp had similar leaf anatomical and morphological traits.
- Taxon
- rice
Oryza sativat0 - Material
- Dawne0
- Organ / stage
- leaf tissuese0
- Outcome
- Anatomical and morphological traitse0
- Direction
- similare0
- Comparator
- Pampe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Anatomical and morphological traits of leaf tissues from 'Pamp' and 'Dawn' were similar”
t0“rice resistance to the South American rice water weevil”
Claim · model-written summary
Significant antibiosis effects were found in the rice resistance evaluation.
- Taxon
- riceOryza sativat0
- Outcome
- antibiosis effectse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant antibiosis effects were found”
t0“rice resistance to the South American rice water weevil”
Claim · model-written summary
Defense antioxidant enzyme activities were higher in Dawn roots than Pamp during larval infestation.
- Taxon
- riceOryza sativat0
- Material
- Dawne0
- Organ / stage
- rootse0
- Outcome
- activities of antioxidant enzymese0
- Direction
- highere0
- Qualifier
- over the period of larval infestation in the fielde0
- Comparator
- Pampe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of antioxidant enzymes involved in plant defense, as well the content of hydroxycinnamic and hydroxybenzoic acids derivatives and lignin, were higher in roots of 'Dawn' than in 'Pamp', over the period of larval infestation in the field”
t0“rice resistance to the South American rice water weevil”
Claim · model-written summary
Hydroxycinnamic and hydroxybenzoic acid derivative content was higher in Dawn roots than Pamp during infestation.
- Taxon
- riceOryza sativat0
- Material
- Dawne0
- Organ / stage
- rootse0
- Outcome
- content of hydroxycinnamic and hydroxybenzoic acids derivativese0
- Direction
- highere0
- Comparator
- Pampe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of hydroxycinnamic and hydroxybenzoic acids derivatives and lignin, were higher in roots of 'Dawn' than in 'Pamp', over the period of larval infestation in the field”
t0“rice resistance to the South American rice water weevil”
Claim · model-written summary
Lignin content was higher in Dawn roots than Pamp during infestation.
- Taxon
- riceOryza sativat0
- Material
- Dawne0
- Organ / stage
- rootse0
- Outcome
- lignine0
- Direction
- highere0
- Comparator
- Pampe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of hydroxycinnamic and hydroxybenzoic acids derivatives and lignin, were higher in roots of 'Dawn' than in 'Pamp', over the period of larval infestation in the field”
t0“rice resistance to the South American rice water weevil”
Claim · model-written summary
Dawn had three layers of lignified root sclerenchyma unlike Pamp, regardless of infestation.
- Taxon
- riceOryza sativat0
- Material
- Dawne0
- Organ / stage
- root sclerenchymae0
- Outcome
- three layers of lignified cellse0
- Qualifier
- regardless of larval infestatione0
- Comparator
- Pampe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Dawn' exhibited a root sclerenchyma arranged in three layers of lignified cells, which differed from the arrangement of cells in 'Pamp', regardless of larval infestation”
t0“rice resistance to the South American rice water weevil”
Claim · model-written summary
Resistance traits were associated with water weevil mortality and malnutrition.
- Taxon
- riceOryza sativae0
- Material
- resistance-related traitse0
- Interactor
- RWWse0pest
- Outcome
- mortality and malnutrition of RWWse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“specific resistance-related traits associated with mortality and malnutrition of RWWs in rice”