Abstract
The herbicide mesotrione inhibits a critical enzyme, phytoene desaturase, in plant carotenoid biosynthesis. Mesotrione is currently labeled for selective weed control in sweet corn ( Zea mays var. rugosa). Mesotrione applied alone, or in mixtures with the photosystem II inhibitor atrazine, acted to increase concentrations of kernel antheraxanthin, lutein, and zeaxanthin carotenoids in several sweet corn genotypes. Kernel lutein and zeaxanthin levels significantly increased 15.6% after mesotrione + atrazine early postemergence applications, as compared to the control treatment. It appears that mesotrione applications resulted in greater pools of kernel carotenoids once the sweet corn genotypes expressing moderate injury overcame the initial herbicidal photo-oxidative stress. This is the first report of herbicides directly up-regulating the carotenoid biosynthetic pathway in corn kernels, which is associated with the nutritional quality of sweet corn. Enhanced accumulation of lutein and zeaxanthin is important because dietary carotenoids function in suppressing aging eye diseases such as macular degeneration, now affecting 1.75 million older Americans.
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Claims 5
Claim · model-written summary
Mesotrione alone increased kernel antheraxanthin, lutein and zeaxanthin in several sweet corn genotypes.
- Taxon
- sweet corne0
- Treatment
- Mesotrione applied alonee0
- Outcome
- concentrations of kernel antheraxanthin, lutein, and zeaxanthin carotenoidse0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“Mesotrione applied alone, or in mixtures with the photosystem II inhibitor atrazine, acted to increase concentrations of kernel antheraxanthin, lutein, and zeaxanthin carotenoids in several sweet corn genotypes.”
Claim · model-written summary
Mesotrione mixed with atrazine increased kernel antheraxanthin, lutein and zeaxanthin in several sweet corn genotypes.
- Taxon
- sweet corne0
- Treatment
- mixtures with the photosystem II inhibitor atrazinee0
- Outcome
- concentrations of kernel antheraxanthin, lutein, and zeaxanthin carotenoidse0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“Mesotrione applied alone, or in mixtures with the photosystem II inhibitor atrazine, acted to increase concentrations of kernel antheraxanthin, lutein, and zeaxanthin carotenoids in several sweet corn genotypes.”
Claim · model-written summary
Early postemergence mesotrione plus atrazine increased kernel lutein significantly by 15.6% relative to control.
Verbatim
e0“Kernel lutein and zeaxanthin levels significantly increased 15.6% after mesotrione + atrazine early postemergence applications, as compared to the control treatment.”
t0“Sweet Corn Kernel Carotenoids”
Claim · model-written summary
Early postemergence mesotrione plus atrazine increased kernel zeaxanthin significantly by 15.6% relative to control.
Verbatim
e0“Kernel lutein and zeaxanthin levels significantly increased 15.6% after mesotrione + atrazine early postemergence applications, as compared to the control treatment.”
t0“Sweet Corn Kernel Carotenoids”
Claim · model-written summary
The authors suggest mesotrione led to larger kernel carotenoid pools after moderately injured genotypes recovered from initial stress.
Verbatim
e0“It appears that mesotrione applications resulted in greater pools of kernel carotenoids once the sweet corn genotypes expressing moderate injury overcame the initial herbicidal photo-oxidative stress.”
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