Pestic Biochem Physiol
State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100086, China. Electronic address:
Published: January 2024
Corynespora leaf spot, caused by Corynespora cassiicola, is a foliar disease in cucumber. While the application of quinone outside inhibitors (QoIs) is an effective measure for disease control, it carries the risk of resistance development. In our monitoring of trifloxystrobin resistance from 2008 to 2020, C. cassiicola isolates were categorized into three populations: sensitive isolates (S, 0.01 < EC < 0.83 μg/mL), moderately resistant isolates (MR, 1.18 < EC < 55.67 μg/mL), and highly resistant isolates (HR, EC > 56.98 μg/mL). The resistance frequency reached up to 90% during this period, with an increasing trend observed in the annual average EC values of all the isolates. Analysis of the CcCytb gene revealed that both MR and HR populations carried the G143A mutation. Additionally, we identified mitochondrial heterogeneity, with three isolates carrying both G143 and A143 in MR and HR populations. Interestingly, isolates with the G143A mutation (G143A-MR and G143A-HR) displayed differential sensitivity to QoIs. Further experiments involving gene knockout and complementation demonstrated that the major facilitator superfamily (MFS) transporter (CcMfs1) may contribute to the disparity in sensitivity to QoIs between the G143A-MR and G143A-HR populations. However, the difference in sensitivity caused by the CcMfs1 transporter is significantly lower than the differences observed between the two populations. This suggests additional mechanisms contributing to the variation in resistance levels among C. cassiicola isolates. Our study highlights the alarming level of trifloxystrobin resistance in C. cassiicola in China, emphasizing the need for strict prohibition of QoIs use. Furthermore, our findings shed light on the occurrence of both target and non-target resistance mechanisms associated with QoIs in C. cassiicola.
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http://dx.doi.org/10.1016/j.pestbp.2023.105760 | DOI Listing |
Front Biosci (Elite Ed)
December 2024
Centro de Apoio Multidisciplinar, Universidade Federal do Amazonas, Manaus, AM 69067-005, Brasil.
Background: Actinobacteria are major producers of antibacterial and antifungal metabolites and are growing their search for substances of biotechnological interest, especially for use in agriculture, among other applications. The Amazon is potentially rich in actinobacteria; however, almost no research studies exist. Thus, we present a study of the occurrence and antifungal potential of actinobacteria from the rhizosphere of , a native South American plant and one that is economically useful in the whole of the Amazon.
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November 2024
Jiangsu Provincial Key Laboratory for Horticultural Crop Genetics and Improvement, Institute of Leisure Agriculture, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
Background: Bigleaf hydrangea (Hydrangea macrophylla) is a widely cultivated ornamental plant species. Leaf spot disease, caused by Corynespora cassiicola, poses a significant threat to the ornamental quality and economic value of hydrangeas. However, the disease resistance breeding of hydrangea is limited due to the lacking of resistant varieties and genes.
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November 2024
Guangzhou University of Chinese Medicine, Research Center of Chinese Herbal Resource Science and Engineering, School of Pharmaceutical Sciences, Guangzhou, Guangdong, China.
Pestic Biochem Physiol
November 2024
College of Plant Protection, Shenyang Agricultural University, No. 120 Dongling Road, Shenhe District, Shenyang City 110866, People's Republic of China. Electronic address:
Cucumber Corynespora leaf spot caused by Corynespora cassiicola is the primary disease responsible for reducing cucumber yield, and prochloraz is the main fungicide used to control C. cassiicola. This study investigated the sensitivity and resistance mechanism of C.
View Article and Find Full Text PDFPlant Dis
October 2024
University of Tsukuba, Fac. Life & Environ., 1-1-1 Tennoudai, Tsukuba, Ibaraki, Japan, 305-8572;
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