Abstract
Abstract Differential tolerance may be observed among rice cultivars with desiccant exposure events during rice reproduction and ripening. Five field studies were established at the Mississippi State University Delta Research and Extension Center in Stoneville, MS, to determine the effects of exposure to sublethal concentrations of common desiccants across multiple rice cultivars. Rice cultivars in the study were ‘CLXL745’, ‘XL753’, ‘CL163’, ‘Rex’, and ‘Jupiter’. Desiccant treatments included no desiccant, paraquat, or glyphosate and were applied at the 50% heading growth stage respective to cultivar. Differential injury estimates among cultivars and desiccant treatments was observed when glyphosate or paraquat was applied at 50% heading. Injury from glyphosate at 50% heading was nondetectable across all cultivars. However, injury following paraquat applications was >7% across all rating intervals and cultivars. Hybrid cultivars exhibited less injury with paraquat applications than the inbred cultivars in the study. Rice following exposure to glyphosate or paraquat at 50% heading growth stage produced rough rice grain yield decreases ranging from 0% to 20% and 9% to 21%, respectively. Rough rice grain yield decreases were observed across all cultivars following paraquat exposure, and all inbred cultivars following glyphosate exposure. Across desiccant treatment, head rice yield was reduced in three of five cultivars in the study. When pooled across cultivar, paraquat applications cause a head rice yield reduction of 10%, whereas rice yield following glyphosate application remained >95%. Although differential tolerance among cultivars to paraquat or glyphosate exposure was observed, impacts on grain quality coupled with yield reductions suggests extreme rice sensitivity to exposure to sublethal concentrations of these desiccants at the 50% heading growth stage.
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Claims 10
Claim · model-written summary
Glyphosate applied at 50% heading caused no detectable injury in any cultivar.
- Taxon
- Rice
Oryza sativat0 - Treatment
- glyphosatee1
- Outcome
- Injurye1
- Qualifier
- nondetectable across all cultivarse1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar response to sublethal concentrations of glyphosate and paraquat”
e1“Injury from glyphosate at 50% heading was nondetectable across all cultivars”
Claim · model-written summary
Paraquat applied at 50% heading caused injury above 7% across all rating intervals and cultivars.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar response to sublethal concentrations of glyphosate and paraquat”
e2“injury following paraquat applications was >7% across all rating intervals and cultivars”
Claim · model-written summary
Hybrid cultivars showed less injury than inbred cultivars after paraquat applications.
- Taxon
- RiceOryza sativat0
- Material
- Hybrid cultivarse3
- Treatment
- paraquate3
- Outcome
- injurye3
- Direction
- lesse3
- Comparator
- inbred cultivarse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar response to sublethal concentrations of glyphosate and paraquat”
e3“Hybrid cultivars exhibited less injury with paraquat applications than the inbred cultivars in the study”
Claim · model-written summary
Glyphosate at 50% heading decreased rough rice grain yield by 0% to 20%.
- Taxon
- RiceOryza sativat0
- Organ / stage
- 50% heading growth stagee4
- Treatment
- glyphosatee4
- Outcome
- rough rice grain yielde4
- Direction
- decreasese4
- Value
- 0% to 20%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar response to sublethal concentrations of glyphosate and paraquat”
e4“Rice following exposure to glyphosate or paraquat at 50% heading growth stage produced rough rice grain yield decreases ranging from 0% to 20% and 9% to 21%, respectively”
Claim · model-written summary
Paraquat at 50% heading decreased rough rice grain yield by 9% to 21%.
- Taxon
- RiceOryza sativat0
- Organ / stage
- 50% heading growth stagee4
- Treatment
- paraquate4
- Outcome
- rough rice grain yielde4
- Direction
- decreasese4
- Value
- 9% to 21%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar response to sublethal concentrations of glyphosate and paraquat”
e4“Rice following exposure to glyphosate or paraquat at 50% heading growth stage produced rough rice grain yield decreases ranging from 0% to 20% and 9% to 21%, respectively”
Claim · model-written summary
Paraquat decreased rough rice grain yield across all cultivars.
- Taxon
- RiceOryza sativat0
- Material
- all cultivarse5
- Treatment
- paraquate5
- Outcome
- Rough rice grain yielde5
- Direction
- decreasese5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar response to sublethal concentrations of glyphosate and paraquat”
e5“Rough rice grain yield decreases were observed across all cultivars following paraquat exposure, and all inbred cultivars following glyphosate exposure”
Claim · model-written summary
Glyphosate decreased rough rice grain yield in all inbred cultivars.
- Taxon
- RiceOryza sativat0
- Material
- all inbred cultivarse5
- Treatment
- glyphosatee5
- Outcome
- Rough rice grain yielde5
- Direction
- decreasese5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar response to sublethal concentrations of glyphosate and paraquat”
e5“Rough rice grain yield decreases were observed across all cultivars following paraquat exposure, and all inbred cultivars following glyphosate exposure”
Claim · model-written summary
Desiccant treatment reduced head rice yield in three of five cultivars.
- Taxon
- RiceOryza sativat0
- Material
- three of five cultivarse6
- Treatment
- desiccante6
- Outcome
- head rice yielde6
- Direction
- reducede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar response to sublethal concentrations of glyphosate and paraquat”
e6“Across desiccant treatment, head rice yield was reduced in three of five cultivars in the study”
Claim · model-written summary
Paraquat applications reduced head rice yield by 10% when pooled across cultivars.
- Taxon
- RiceOryza sativat0
- Treatment
- paraquat applicationse7
- Outcome
- head rice yielde7
- Direction
- reductione7
- Value
- 10%e7
- Qualifier
- When pooled across cultivare7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar response to sublethal concentrations of glyphosate and paraquat”
e7“When pooled across cultivar, paraquat applications cause a head rice yield reduction of 10%, whereas rice yield following glyphosate application remained >95%”
Claim · model-written summary
Rice yield after glyphosate application remained above 95%.
- Taxon
- RiceOryza sativat0
- Treatment
- glyphosate applicatione7
- Outcome
- rice yielde7
- Direction
- remainede7
- Value
- >95%e7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar response to sublethal concentrations of glyphosate and paraquat”
e7“When pooled across cultivar, paraquat applications cause a head rice yield reduction of 10%, whereas rice yield following glyphosate application remained >95%”
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See all 8 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.