Effects of Flubeneteram on Inhibiting the Development of Puccinia striiformisf. sp. triticiin Wheat Leaves

Stripe rust caused by Puccinia striiformisf. sp. tritici(Pst) is a serious threat to wheat production, and the application of fungicides is one of the most important means for controlling the disease. The purpose of this study is to determine the effects of a new succinate dehydrogenase inhibitor (SDHI) fungicide, flubeneteram, on reducing stripe rust. The baseline sensitivity of 173 Pstisolates from 13 provinces of China to flubeneteram was determined. Flubeneteram displayed significant effects on inhibiting SDH enzymes of Pst. Histological observations showed that after flubeneteram application, the formation and development of Psthyphae and haustoria were significantly inhibited, and the structures were destroyed. Flubeneteram primed wheat for salicylic acid-induced defenses via upregulating pathogenesis-related genes (PR1and PR2). Altogether, our study is the first to provide evidence that flubeneteram induces wheat defense against Pstinfection. The findings indicate that flubeneteram could be an effective fungicide for managing stripe rust.