American sloughgrass (Beckmannia syzigachne Steud.) has become a dominant weed in fields with rice-wheat rotation. Moreover, herbicide resistance has rendered weed control difficult. We identified a biotype showing resistance to ALS inhibitor mesosulfuron-methyl with a resistant index 3.3, but without any ALS mutation. This study aims to identify and confirm the factors associated with non-target site resistance of this biotype to mesosulfuron-methyl using RNA-Seq. 118,111 unigenes were assembled, and 50.9% of these were annotated across seven databases. Eleven contigs related to metabolic resistance were identified based on differential expression via RNA-Seq which include a novel resistance-related transcription factor (MYC3) and two disease resistance proteins were also identified (At1g58602 and At1g15890). Fold changes in expression of these genes in comparison M-R vs. M-S ranged from 3.9 to 11.6, as confirmed by qPCR. The expression of a contig annotated as cytochrome P450 (CYP86B1) in resistant individuals was over 3 times higher than that in sensitive individuals at 0-72 h after mesosulfuron-methyl treatment. A similar trend was noted for three other genes annotated as glutathione S-transferase (GST), namely GST-T3, GST-U6, and GST-U14; the expression of GST-U6 in resistant individuals was up to 142.3 times higher than that in sensitive individuals at 24 h after mesosulfuron-methyl treatment. In addition, GST activity in resistant individuals was 2.1 to 5.3 times higher than that in sensitive individuals. The GR of resistant biotype decreased from 24.4 to 11.3 g a.i. ha after P450 inhibitor malathion treatment. This study identified a cytochrome P450 gene CYP86B1 and three GST genes GST-T3, GST-U6, and GST-U14 that have higher expression in mesosulfuron-methyl resistant B. syzigachne, suggesting that both P450- and GST-based activities could be involved in resistance.
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