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Acta Agronomica Sinica ›› 2025, Vol. 51 ›› Issue (5): 1338-1346.doi: 10.3724/SP.J.1006.2025.42048

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Study on the sensitivity of various physiological races of Magnaporthe oryzae to isoprothiolane in Anhui province, China

SHEN Wen-Jie1(), CHEN Qing-Qing1, HU Yi-Qun1, ZHANG Ai-Fang1,*(), ZHANG Man-Yu2   

  1. 1Institute of Plant Protection and Agricultural Product Quality Safety, Anhui Academy of Agricultural Sciences / Anhui Province Key Laboratory of Pesticide Resistance Management on Grain and Vegetable Pests, Hefei 230001, Anhui, China
    2Suzhou Academy of Agricultural Sciences, Suzhou 234099, Anhui, China
  • Received:2024-10-28 Accepted:2025-01-23 Online:2025-05-12 Published:2025-02-11
  • Contact: *E-mail: aifangz@163.com
  • Supported by:
    2025 Agricultural Research Special Project-Youth Foundation Program (Shen Wenjie)

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Abstract:

To investigate variations in the sensitivity of different physiological races of Magnaporthe oryzae to isoprothiolane in Anhui Province, 173 M. oryzae isolates were collected from 17 regions across the province during 2021-2022. The physiological races of these isolates were identified using seven differential rice hosts from China. The sensitivity of M. oryzae to isoprothiolane, along with potential cross-resistance to other fungicides, was assessed by measuring mycelial growth rates. The results showed that the 173 M. oryzae isolates belonged to five populations: ZA, ZB, ZC, ZG, and ZH. Among these, the ZB population was predominant, with ZB13 identified as the dominant physiological race. The EC50 values of the isolates ranged from 1.68 to 28.83 μg mL-1, and a baseline sensitivity value of 5.54 μg mL-1 was established for isoprothiolane in Anhui province. Among the isolates, 102 were classified as sensitive, 70 as low-resistant, and 1 as moderately resistant. The resistance levels of the dominant physiological races ZB13, ZB15, and ZB16, identified in regions such as Fengtai County and Xuancheng District, were significantly lower than those observed in regions such as Nanling County and Shitai County. This finding suggests that variations in the sensitivity of M. oryzae to isoprothiolane in Anhui Province are primarily influenced by geographic location rather than physiological race. Furthermore, no significant correlation was found between sensitivity to isoprothiolane and sensitivity to pyraclostrobin or prochloraz. These results indicate that, under the premise of rational rotation with other fungicides, isoprothiolane can continue to serve as a key fungicide for managing rice blast disease in Anhui province.

Key words: Anhui province, Magnaporthe oryzae, physiological races, isoprothiolane, resistance

Table 1

Identification of physiological races of Magnaporthe oryzae in Anhui province"

种群
Group		 菌株数量
Number of strains		 占比
Frequency (%)		 生理小种
Physiological race		 生理小种数量
Number of physiological race		 占比
Frequency (%)
ZA 2 1.16 ZA15 1 0.58
ZA5 1 0.58
ZB 128 73.99 ZB13 69 39.88
ZB9 19 10.98
ZB15 17 9.83
ZB16 13 7.51
ZB5 3 1.73
ZB14 3 1.73
ZB1 2 1.16
ZB29 1 0.58
ZB8 1 0.58
ZC 36 20.81 ZC16 18 10.40
ZC15 15 8.67
ZC1 1 0.58
ZC11 1 0.58
ZC14 1 0.58
ZG 5 2.89 ZG 5 2.89
ZH 2 1.16 ZH 2 1.16

Table 2

Detail information of physiological races of M. oryzae in 17 districts of Anhui province"

地区
District		 合计
Summation		 生理小种(数量)
Physiological race (number of strain)
当涂县Dangtu 5 ZB13(5)
凤台县Fengtai 17 ZB13(2), ZB15(4), ZB16(5), ZC15(3), ZC16(3)
贵池区Guichi 8 ZB13(8)
肥西县Feixi 6 ZA5(1), ZB1(1), ZB5(1), ZB9(1), ZB13(2)
怀远县Huaiyuan 6 ZB9(6)
潘集区Panji 7 ZB9(6), ZB13(1)
黄山区Huangshan 5 ZB9(1), ZB13(4)
金寨县Jinzhai 14 ZB13(13), ZB16(1)
南陵县Nanling 16 ZB13(4), ZB14(3), ZB15(1), ZB16(1), ZC11(1), ZC15(4), ZC16(2)
中溪镇Zhongxi 4 ZB5(1), ZB9(1), ZB13(2)
歙县Shexian 4 ZC16(4)
石台县Shitai 16 ZB8(1), ZB13(2), ZB15(3), ZB16(3), ZC1(1), ZC16(4), ZG(1), ZH(1)
寿县Shouxian 10 ZB1(1), ZB5(1), ZB9(2), ZB13(5), ZB15(1)
开城镇Kaicheng 5 ZB9(2), ZB13(3)
休宁县Xiuning 19 ZB13(1), ZB15(1), ZB16(2), ZC14(1), ZC15(5), ZC16(4), ZG(4), ZH(1)
宣州区Xuanzhou 25 ZA15(1), ZB13(11), ZB15(7), ZB16(1), ZB29(1), ZC15(3), ZC16(1)
岳西县Yuexi 6 ZB13(6)

Fig. 1

Frequency distribution of sensitivity to isoprothiolane among M. oryzae in Anhui province"

Table 3

Sensitivities of M. oryzae to isoprothiolane in different physiological races"

生理小种
Physiological race		 菌株数量Number of strains 敏感
S		 低抗
LR		 中抗
MR		 EC50范围
EC50 range
(μg mL-1)		 平均EC50
Average EC50 value (μg mL-1)		 差异倍数
Difference multiplier		 抗性菌株占比Frequency of
resistant strains (%)
ZB13 69 49 20 — 2.08-11.34 4.72 5.45 28.99
ZB9 19 10 8 1 2.11-28.83 6.98 13.66 47.37
ZC16 18 9 9 — 3.65-11.72 6.60 3.21 50.00
ZB15 17 13 4 — 2.67-9.11 6.23 3.41 23.53
ZC15 15 5 10 — 2.98-10.54 6.80 3.54 66.67
ZB16 13 8 5 — 2.52-8.97 6.55 3.56 38.46
ZG 5 — 5 — 7.01-8.74 7.60 1.25 100.00
ZB14 3 — 3 — 6.29-12.84 9.05 2.04 100.00
ZB5 3 2 1 — 3.77-6.94 5.01 1.84 33.33
ZB1 2 1 1 — 3.88-7.00 5.44 1.80 50.00
ZH 2 1 1 — 4.20-5.78 4.99 1.38 50.00
ZA15 1 1 — — — 3.60 — 0
ZA5 1 — 1 — — 9.96 — 100.00
ZB29 1 1 — — — 4.54 — 0
ZB8 1 — 1 — — 10.62 — 100.00
ZC1 1 1 — — — 3.43 — 0
ZC11 1 — 1 — — 11.71 — 100.00
ZC14 1 1 — — — 4.14 — 0
合计Total 173 102 70 1
占比Frequency (%) 100.00 58.96 40.46 0.58

Table 4

Sensitivity of M. oryzae to isoprothiolane in different districts of Anhui province"

地区
District		 菌株数量
Number of strains		 EC50范围
EC50 range
(μg mL-1)		 差异倍数Difference multiplier 平均EC50值
Average EC50 value
(μg mL-1)		 抗性菌株占比
Frequency of resistant strains (%)
当涂县Dangtu 5 6.14-6.89 1.12 6.38 100.00
凤台县Fengtai 17 2.52-8.32 3.31 4.52 11.76
贵池区Guichi 8 1.68-4.07 2.42 2.95 0
肥西县Feixi 6 5.86-9.96 1.70 7.50 100.00
怀远县Huaiyuan 6 6.53-28.83 4.11 13.82 100.00
潘集区Panji 7 1.83-4.08 2.24 3.26 0
黄山区Huangshan 5 3.49-7.44 2.13 4.95 20.00
金寨县Jinzhai 14 2.67-6.56 2.45 3.93 7.14
南陵县Nanling 16 5.29-12.84 2.43 8.86 93.75
中溪镇Zhongxi 4 3.35-4.34 1.30 3.88 0
歙县Shexian 4 4.39-6.33 1.44 5.69 75.00
石台县Shitai 16 3.43-11.72 3.42 7.41 75.00
寿县Shouxian 10 2.36-4.64 1.97 3.64 0
开城镇Kaicheng 5 5.72-7.02 1.23 6.27 100.00
休宁县Xiuning 19 3.76-10.52 2.80 6.22 52.63
宣州区Xuanzhou 25 2.51-6.22 2.48 4.20 8.00
岳西县Yuexi 6 2.68-9.80 3.66 4.98 33.33

Table 5

Average EC50 values of major physiological races of M. oryzae in different districts of Anhui province (μg mL-1)"

地区
District		 生理小种Physiological races
ZB9 ZB13 ZB15 ZB16 ZC15 ZC16
凤台县Fengtai — 4.17 3.81 4.44 5.70 4.64
休宁县Xiuning — 4.39 3.99 5.14 5.12 7.30
宣州区Xuanzhou — 3.76 4.57 3.39 5.40 4.54
南陵县Nanling — 9.14 7.68 6.65 8.88 8.23
石台县Shitai — 6.09 9.34 9.07 — 6.05
寿县Shouxian 4.02 3.35 3.93 — — —
中溪镇Zhongxi 3.35 3.93 — — — —
开城镇Kaicheng 6.76 5.94 — — — —
金寨县Jinzhai — 3.96 — 3.57 — —
肥西县Feixi 5.87 7.61 — — — —
潘集区Panji 3.19 3.72 — — — —
黄山区Huangshan 3.49 5.31 — — — —

Fig. 2

Correlation between the sensitivity of M. oryzae to isoprothiolane and pyraclostrobin"

Fig. 3

Correlation between the sensitivity of M. oryzae to isoprothiolane and prochloraz"

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