Abstract
Key message
A frame shift invoked by a single-base deletion in the gene encoding a cytochrome P450 hydroxylase, CYP81E22, causes the loss of bentazon detoxification function in soybean.
Abstract
Bentazon is an effective herbicide in soybean cultivation applied at post-emergence stages for control of several broadleaf weeds. However, some soybean cultivars are highly sensitive to bentazon and are killed upon application. In this study, the gene related to the high sensitivity of soybean cultivars to bentazon was mapped to chromosome 16, and its location was narrowed down to a 257-kb region where three cytochrome P450 genes were located. In these genes, a single-base deletion of cytosine was detected in the coding region of Glyma.16G149300, CYP81E22, at + 1465 bp downstream from the translation start codon, leading to a frame shift in the open reading frame and creating a premature stop codon. This stop codon resulted in the loss of more than half of the P450, and consequently, the remaining molecule failed to form a functioning protein. This single-base deletion was common among the highly sensitive cultivars screened from the soybean mini-core collection and other previously reported highly sensitive cultivars. Furthermore, we screened plant lines from the targeting-induced local lesions in genomes library of the soybean cultivar Enrei based on a modelled 3D structure of CYP81E22. The lines with mutations in Glyma.16G149300 were highly sensitive to bentazon, which provides strong evidence that Glyma.16G149300 is the gene responsible for high sensitivity to bentazon.
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Acknowledgements
We thank Hitoshi Sato, Osamu Fujii, Yuko Sato, Akihiro Takahashi, Kosei Awatsu, Hisaho Takagai, and Kenei Takahashi (NARO) for the field management of yield trials and Fumiyo Ito for technical assistance in the experiments.
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SK and MI planned and designed the overall research. SK, YY, TS, KK, and NO performed the positional cloning. SK, YY, and AK evaluated the reactions of plant materials to bentazon. SK, YY, RS, AK, and TA screened the mutant lines with the mutation in the candidate gene. SK, YY, YF, and MI determined and compared the sequences of the candidate genes.
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Kato, S., Yokota, Y., Suzuki, R. et al. Identification of a cytochrome P450 hydroxylase, CYP81E22, as a causative gene for the high sensitivity of soybean to herbicide bentazon. Theor Appl Genet 133, 2105–2115 (2020). https://doi.org/10.1007/s00122-020-03580-6
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DOI: https://doi.org/10.1007/s00122-020-03580-6