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Identification of Pathogen Causing Brown Spot in Leaves of Cycas and Its Chemical Control Agent Screening
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Qian QIN1, Liqiong DING1, Zhaojin CHI1, Zuzheng LU1, Bin SHAN1, Zhenxing XIE1, Xinyi HUANG1, Tian XU2, *
Chinese Journal of Tropical Crops | 2024, 45(8) : 1677 - 1684
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Chinese Journal of Tropical Crops | 2024, 45(8): 1677-1684
• Plant Protection & Bio-safety •
Identification of Pathogen Causing Brown Spot in Leaves of Cycas and Its Chemical Control Agent Screening
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Qian QIN1, Liqiong DING1, Zhaojin CHI1, Zuzheng LU1, Bin SHAN1, Zhenxing XIE1, Xinyi HUANG1, Tian XU2, *
Affiliations
  • 1.Guangxi Subtropical Crops Research Institute, Nanning, Guangxi 530001, China
  • 2.Nanning Botanical Garden, Nanning, Guangxi 530029, China
Published: 2024-08-25 doi: 10.3969/j.issn.1000-2561.2024.08.017
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This research aimed to identify a pathogenic fungus of the brown spot disease in the leaves of Cycas and screen for its chemical control agents, which provides a theoretical basis for the protection of Cycas. The pathogenic fungus was isolated from the lesion spots in some Cycas leaves. The pathogenicity of the fungus was confirmed by isolating and purifying the infected leaf tissues and reintroduced to the healthy leaves of Cycas diannanensis following Koch’s postulates. Morphological identification of the pathogenic fungus was conducted. To further confirm the identification, a phylogenetic tree was constructed using eight gene sequences: SSU, LSU, GAPDH, tef1, rpb2, Alt, OPA10-2 and ITS. Effective chemical control agents were screened from seven chemical agents by inhibition assay in vitro. Phylogenetic analyses showed that this pathogen was Alternaria burnsii. Among the tested chemical agents, the most effective inhibition was fluoxastrobin, which displayed 73.48% inhibition rate at a concentration of 0.67 mg/L.

Cycas  /  brown spot  /  pathogen identification  /  Alternaria burnsii  /  the inhibition assay in vitro
覃茜, 丁丽琼, 池昭锦, 陆祖正, 单彬, 谢振兴, 黄歆怡, 许恬. 苏铁羽叶褐斑病病原菌鉴定及其化学防治药剂的筛选. 热带作物学报, 2024 , 45 (8) : 1677 -1684 . DOI: 10.3969/j.issn.1000-2561.2024.08.017
Qian QIN, Liqiong DING, Zhaojin CHI, Zuzheng LU, Bin SHAN, Zhenxing XIE, Xinyi HUANG, Tian XU. Identification of Pathogen Causing Brown Spot in Leaves of Cycas and Its Chemical Control Agent Screening[J]. Chinese Journal of Tropical Crops, 2024 , 45 (8) : 1677 -1684 . DOI: 10.3969/j.issn.1000-2561.2024.08.017
Appendix
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Year 2024 volume 45 Issue 8
531
271
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Article Info
doi: 10.3969/j.issn.1000-2561.2024.08.017
  • Receive Date：2023-06-30
  • Online Date：2026-06-23
  • Published：2024-08-25
Article Data
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History
  • Received：2023-06-30
  • Revised：2023-10-18
Funding
Affiliations
    1.Guangxi Subtropical Crops Research Institute, Nanning, Guangxi 530001, China
    2.Nanning Botanical Garden, Nanning, Guangxi 530029, China
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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