Abstract
Mutation of a cytochrome P450 ( CYP ) allele on the short arm of chromosome 5 affects sensitivity in sweet corn to mesotrione and to tembotrione plus isoxadifen applied POST. Hybrids that are homozygous for the functional allele (i.e., CYPCYP ) are rarely injured at registered use rates, hybrids that are homozygous for mutant alleles (i.e., cypcyp ) are frequently injured, and hybrids that are heterozygous for a functional and mutant allele (i.e., CYPcyp ) have more variable responses over trials. The objectives of this work were (1) to conduct side-by-side comparisons of sweet corn hybrid responses to mesotrione, tembotrione plus isoxadifen, and topramezone under field conditions; and (2) to compare dose–response relationships among CYPCYP , CYPcyp , and cypcyp hybrids. Among 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitors used POST in sweet corn, topramezone was safe on the 746 hybrids tested. When environmental conditions favored crop growth, mesotrione injured the largest number of hybrids, and these hybrids were almost exclusively cypcyp or CYPcyp . The safener isoxadifen added to the tembotrione product greatly reduced occurrence of injury to the CYPcyp genotypic class but not to the cypcyp hybrids. Despite a common genetic basis for herbicide metabolism, genotypic classes of sweet corn hybrids did not have identical field responses to mesotrione, tembotrione plus isoxadifen, and topramezone.
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Claims 5
Claim · model-written summary
Topramezone was safe on all 746 tested sweet corn hybrids.
Not reportedComparatorDirection
Verbatim
e0“topramezone was safe on the 746 hybrids tested”
t0“Factors Affecting Differential Sensitivity of Sweet Corn to HPPD-Inhibiting Herbicides”
Claim · model-written summary
Mesotrione injured the largest number of hybrids under growth-favorable conditions.
- Taxon
- Sweet Cornt0
- Material
- cypcyp or CYPcype0
- Treatment
- mesotrionee0
- Outcome
- injured the largest number of hybridse0
- Direction
- largeste0
- Qualifier
- When environmental conditions favored crop growthe0
Not reportedComparator
Verbatim
e0“When environmental conditions favored crop growth, mesotrione injured the largest number of hybrids, and these hybrids were almost exclusively cypcyp or CYPcyp”
t0“Factors Affecting Differential Sensitivity of Sweet Corn to HPPD-Inhibiting Herbicides”
Claim · model-written summary
Isoxadifen added to tembotrione greatly reduced injury among CYPcyp hybrids.
- Taxon
- Sweet Cornt0
- Material
- CYPcype0
- Treatment
- isoxadifen added to the tembotrione producte0
- Outcome
- occurrence of injurye0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“The safener isoxadifen added to the tembotrione product greatly reduced occurrence of injury to the CYPcyp genotypic class but not to the cypcyp hybrids”
t0“Factors Affecting Differential Sensitivity of Sweet Corn to HPPD-Inhibiting Herbicides”
Claim · model-written summary
Isoxadifen added to tembotrione did not reduce injury among cypcyp hybrids.
- Taxon
- Sweet Cornt0
- Material
- cypcyp hybridse0
- Treatment
- isoxadifen added to the tembotrione producte0
- Outcome
- occurrence of injurye0
- Direction
- no_changeinferrede0
Not reportedComparator
Verbatim
e0“The safener isoxadifen added to the tembotrione product greatly reduced occurrence of injury to the CYPcyp genotypic class but not to the cypcyp hybrids”
t0“Factors Affecting Differential Sensitivity of Sweet Corn to HPPD-Inhibiting Herbicides”
Claim · model-written summary
Sweet corn genotype classes differed in field response across three HPPD inhibitors.
Verbatim
e0“genotypic classes of sweet corn hybrids did not have identical field responses to mesotrione, tembotrione plus isoxadifen, and topramezone”
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