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- W3045588180 abstract "Abstract Postemergence grass weed control continues to be a big challenge in grain sorghum ( Sorghum bicolor L. Moench), primarily due to a lack of herbicide options registered for use in this crop. The development of herbicide-resistant sorghum technology to facilitate broad-spectrum postemergence weed control is an economical and viable solution. The 4-hydroxyphenylpyruvate dioxygenase-inhibitor herbicides (e.g. mesotrione or tembotrione) can control broad-spectrum of weeds including grasses, which, however, is not registered for postemergence application in sorghum due to crop injury. In this study we identified two tembotrione-resistant sorghum genotypes (G-200, G-350) and one highly susceptible genotype (S-1) through screening 317 sorghum lines from the sorghum association panel (SAP). Compared to S-1, G-200 and G-350 exhibited 10- and 7-fold more resistance to tembotrione, respectively. Genetic analyses of the F 1 and F 2 progeny generated from a cross between tembotrione-resistant and -susceptible genotypes demonstrated that the resistance is a semi-dominant polygenic trait. Furthermore, cytochrome P450 (CYP)-inhibitor assay using malathion and piperonyl butoxide suggested possible CYP-mediated metabolism of tembotrione in G-200 and G-350. Genotype-by-sequencing based quantitative trait loci (QTL) mapping revealed eight QTLs associated with tembotrione resistance in grain sorghum. Sorghum genotypes G-200 and G-350 confer a high level of metabolic resistance to tembotrione and controlled by a polygenic trait. There is an enormous potential to introgress the tembotrione resistance into breeding lines to develop agronomically desirable sorghum hybrids. One-sentence summary This research focuses on characterization, genetic analyses, identification of QTLs-linked to metabolic resistance to tembotrione in Sorghum bicolor, for improved weed control and increased yield" @default.
- W3045588180 created "2020-08-03" @default.
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- W3045588180 date "2020-07-30" @default.
- W3045588180 modified "2023-09-27" @default.
- W3045588180 title "Resistance to tembotrione, a 4- Hydroxyphenylpyruvate Dioxygenase-Inhibitor in Sorghum bicolor" @default.
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- W3045588180 doi "https://doi.org/10.1101/2020.07.29.227512" @default.
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