In present study, the morphological and physiological characteristics of Sclerotinia sclerotiorum (Lib.) de Bary to a novel succinate dehydrogenase inhibitor (SDHI) fungicide penthiopyrad has been reported. The baseline sensitivity of S. sclerotiorum to penthiopyrad was determined using 119 strains by inhibition of mycelial growth. The median effective concentration (EC₅₀) values for penthiopyrad ranged from 0.0096 to 0.2606 μg/ml, and the mean value was 0.0578 (±0.0626) μg/ml. After 1 μg/ml penthiopyrad treatment, mycelia of S. sclerotiorum strains showed increased apical branching and were denser compared with control, and cell membrane permeability significantly increased. In addition, glycerol content, oxalic acid (OA), and exopolysaccharide (EPS) content decreased markedly and mycelial respiration was distinctly inhibited. The number and dry weight of sclerotia significantly decreased after being treated with 2 μg/ml penthiopyrad. Penthiopyrad exhibited both protective and curative activity on the detached rapeseed leaves. Importantly, the above results will provide us more information on penthiopyrad for management of diseases caused by S. sclerotiorum and increase our understanding of action of penthiopyrad against S. sclerotiorum.

在本研究中，已经报道了巩膜核盘菌（Sclerotiorum de Liy）对新型琥珀酸脱氢酶抑制剂（SDHI）杀真菌剂戊硫吡ase的形态和生理特性。使用119个菌株通过抑制菌丝体生长来确定核盘菌对戊硫吡喃的基线敏感性。苯并吡喃的中位有效浓度（EC ₅₀）值在0.0096至0.2606μg/ ml之间，平均值为0.0578（±0.0626）μg/ ml。经过1μg/ ml的戊硫吡rad处理后，核盘菌的菌丝体菌株显示根尖分支增加，并且与对照相比密度更高，并且细胞膜通透性显着提高。此外，甘油含量，草酸（OA）和胞外多糖（EPS）含量显着降低，并明显抑制了菌丝体呼吸。用2μg/ ml戊硫吡py处理后，菌核的数量和干重显着降低。Penthiopyrad对分离的菜籽叶显示出保护性和治愈性活性。重要的是，以上结果将为我们提供更多有关戊硫吡菌用于治疗由核盘菌引起的疾病的信息，并加深我们对戊硫吡菌对菌核盘菌的作用的了解。