Abstract
Potato (Solanum tuberosum), an important food crop worldwide, is threatened by broadleaf weeds. Bentazone is an effective herbicide for controlling weeds; however, as a photosynthesis inhibitor, it can also affect potato plants. Therefore, screening potato seedlings for bentazone resistance and determining the genes involved is essential. Herein, we selected potato varieties with tolerance and sensitivity to bentazone. The photosynthetic rate of sensitive plants was notably affected by bentazone application, whereas the tolerant plants showed a significantly higher photosynthetic rate. We observed 95.7% bentazone degradation within 24 d after application in the tolerant plants. Transcriptome sequencing revealed that the numbers of differentially expressed genes (DEGs) between the tolerant and sensitive potato seedlings were 2703 and 11,024 before and after bentazone application, respectively. Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis revealed that the majority of DEGs were enriched in metabolic pathways, biosynthesis of secondary metals, carbon metabolism, glutathione metabolism, and photosynthesis. Polyphenol oxidase (PPO), flavonoid 3′,5′-methyltransferase-like (AOMT3), ribulose bisphosphate carboxylase small chain C (RBCS-C), and chalcone synthase 2 (CHS2) were identified as candidates contributing to bentazone tolerance. These results provide a theoretical basis for selecting potato stress-resistant resources in the future.
Highlights
Potato (Solanum tuberosum L.) is the most important non-grain food crop worldwide and is central to maintaining global food security
Bentazone is a selective-contact herbicide that is widely used as a postemergence treatment on soybean, wheat, and rice fields
Bentazone is readily absorbed by leaves; the absorption and translocation rate varies among plant species and varieties
Summary
Potato (Solanum tuberosum L.) is the most important non-grain food crop worldwide and is central to maintaining global food security. As the fourth major food crop worldwide, S. tuberosum provides an important source of high-quality starch in addition to being a nutritious food staple. Bentazone (C10H12N2O3S), which is an important component of chemical herbicides used in potato fields, is applied to control broadleaf weeds such as Galium spp. For bentazone to be an effective herbicide, the crop plants must not be sensitive to bentazone. Bentazone can produce phytotoxic effects in some potato crops, which limits its usefulness for controlling broadleaf weeds in potato fields. Screening potato seedlings for bentazone resistance can effectively solve this problem, allowing for further development of bentazone as an efficient herbicide for potato fields
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