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In vitro fungicidal activity and in planta control efficacy of coumoxystrobin against Magnaporthe oryzae
Pesticide Biochemistry and Physiology ( IF 4.2 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.pestbp.2019.09.004
Wenjing Xin 1 , Yushuai Mao 1 , Fei Lu 1 , Tao Li 1 , Jianxin Wang 2 , Yabing Duan 2 , Mingguo Zhou 2
Affiliation  

Rice blast, caused by Magnaporthe oryzae, is a destructive fungal disease in rice, causing serious losses in yield and quality. Coumoxystrobin is a novel methoxyacrylate strobilurin fungicide. In the current study, we determined the sensitivity of 100 M. oryzae strains to coumoxystrobin based on the mycelial growth inhibition method. The EC50 values ranged from 0.0089 to 0.0290 μg mL-1, with a mean EC50 value of 0.0163 ± 0.0036 μg mL-1, indicating that coumoxystrobin exhibits an excellent inhibitory activity in the mycelial growth of M. oryzae. In addition, the EC50 values had no significant difference among four populations from the different geographical regions. After treating with coumoxystrobin, cell membrane permeability increased, respiration decreased, and the hyphal tips were contorted, with offshoot of top increasing. Protective and curative activity tests showed that coumoxystrobin exhibited better protective and curative activities against M. oryzae in detached barley leaves in comparison to the currently used fungicides tricyclazole and azoxystrobin. Also, it was found that the protective activity was better than its curative activity. Furthermore, compared with the currently used fungicides, coumoxystrobin not only exhibited excellent control efficacy on rice blast, but also markedly reduced the dosages of chemical fungicides in the field trials. Overall, these findings provide important references for revealing the pharmacological effect of coumoxystrobin against M. oryzae and managing rice blast caused by M. oryzae.

中文翻译:

嘧菌酯对稻瘟病菌的体外杀菌活性和植物防治功效

稻瘟病是由稻瘟病菌引起的一种水稻破坏性真菌病害,严重影响水稻产量和品质。嘧菌酯是一种新型的甲氧基丙烯酸酯嗜球果伞素杀菌剂。在当前的研究中,我们基于菌丝体生长抑制方法确定了 100 M. oryzae 菌株对嘧菌酯的敏感性。EC50 值范围为 0.0089 至 0.0290 μg mL-1,平均 EC50 值为 0.0163 ± 0.0036 μg mL-1,表明嘧菌酯对米曲霉菌丝体生长具有极好的抑制活性。此外,来自不同地理区域的四个人群的EC50值没有显着差异。用嘧菌酯处理后,细胞膜通透性增加,呼吸减少,菌丝尖端扭曲,顶端分支增加。保护和治疗活性测试表明,与目前使用的杀菌剂三环唑和嘧菌酯相比,嘧菌酯对离体大麦叶片中的米菌表现出更好的保护和治疗活性。此外,发现保护活性优于其治疗活性。此外,与目前使用的杀菌剂相比,嘧菌酯不仅对稻瘟病表现出优异的防治效果,而且在田间试验中显着降低了化学杀菌剂的用量。总体而言,这些发现为揭示嘧菌酯对稻瘟病菌的药理作用和防治稻瘟病菌引起的稻瘟病提供了重要参考。与目前使用的杀菌剂三环唑和嘧菌酯相比,大麦分离叶中的稻瘟病菌。此外,发现保护活性优于其治疗活性。此外,与目前使用的杀菌剂相比,嘧菌酯不仅对稻瘟病表现出优异的防治效果,而且在田间试验中显着降低了化学杀菌剂的用量。总体而言,这些发现为揭示嘧菌酯对稻瘟病菌的药理作用和防治稻瘟病菌引起的稻瘟病提供了重要参考。与目前使用的杀菌剂三环唑和嘧菌酯相比,大麦分离叶中的稻瘟病菌。此外,发现保护活性优于其治疗活性。此外,与目前使用的杀菌剂相比,嘧菌酯不仅对稻瘟病表现出优异的防治效果,而且在田间试验中显着降低了化学杀菌剂的用量。总体而言,这些发现为揭示嘧菌酯对稻瘟病菌的药理作用和防治稻瘟病菌引起的稻瘟病提供了重要参考。嘧菌酯不仅对稻瘟病表现出优异的防治效果,而且在田间试验中显着降低了化学杀菌剂的用量。总体而言,这些发现为揭示嘧菌酯对稻瘟病菌的药理作用和防治稻瘟病菌引起的稻瘟病提供了重要参考。嘧菌酯不仅对稻瘟病表现出优异的防治效果,而且在田间试验中显着降低了化学杀菌剂的用量。总体而言,这些发现为揭示嘧菌酯对稻瘟病菌的药理作用和防治稻瘟病菌引起的稻瘟病提供了重要参考。
更新日期:2020-01-01
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