Comprehensive study of chiral herbicide flusulfinam uptake, translocation, degradation, and subcellular distribution in rice (Oryza sativa L.)

• Published in: Pesticide biochemistry and physiology 2024-09, Vol.204, p.106018, Article 106018
• Main Authors: Liu, Shiling, Li, Xiaoli, Zhang, Heng, Qin, Siying, Liang, Liying, Liao, Ying, Zhu, Junqi, Tan, Huihua, Zhao, Feng
• Format: Article
• Language: English
• Subjects: Biological Transport; Degradation; Enantioselectivity; Flusulfinam; Herbicides - metabolism; Oryza - metabolism; Plant Roots - metabolism; Plant Shoots - metabolism; Stereoisomerism; Subcellular distribution; Transporter; Uptake mechanism
• ISSN: 0048-3575; 1095-9939; 1095-9939
• DOI: 10.1016/j.pestbp.2024.106018

The biological behavior of flusulfinam, a potential commercial chiral herbicide for rice, has not been well explored. Herein, the uptake of chiral flusulfinam by rice and its transport, degradation, and subcellular distribution in rice (Oryza sativa L.) were investigated. The enantiomeric fraction (EF) in roots was 0.54 during 0 d to 7 d in hydroponic laboratory conditions. The bioconcentration factor of flusulfinam enantiomers was 2.1, suggesting an absence of observed enantioselectivity in the absorption process. Notably, the EF in the shoots decreased to 0.35 on the 7th day. The translocation factors of R- and S-flusulfinam were 0.12 and 0.27, respectively, indicating a preferential transfer of the S-flusulfinam from the root to the shoot. Flusulfinam was identified in the root after spraying. The translocation factors of R- and S-flusulfinam were consistently similar, signifying the capacity for downward movement without enantioselectivity. Interestingly, the degradation half-lives of R- and S-flusulfinam in the total plant were 5.50 and 5.06 d (p