The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Fitness is Recovered with the Decline of Dimethachlon Resistance in Laboratory-induced Mutants of Sclerotinia sclerotiorum after Long-term Cold Storage

  • Li, Jin-Li (College of Plant Science and Technology, Huazhong Agricultural University) ;
  • Wu, Feng-Ci (Agro-Biotechnology Institute of Jilin Academy of Agricultural Sciences) ;
  • Zhu, Fu-Xing (College of Plant Science and Technology, Huazhong Agricultural University)
  • Received : 2015.04.27
  • Accepted : 2015.07.05
  • Published : 2015.09.01
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Abstract

After four years of cold storage, dimethachlon resistance of two laboratory-induced resistant Sclerotinia sclerotiorum isolates SCG7 and LA50 declined by 99.5% and 98.9%, respectively, and cross resistance to iprodione and procymidone also declined dramatically. Along with the decline of fungicide resistance, osmotic sensitivity to sodium chloride and glucose decreased tremendously; mycelial growth rate, sclerotia number and weight per potato dextrose agar (PDA) plate increased on average by 118.6%, 85. 5% and 64.5%, respectively; and virulence to detached leaves of oilseed rape increased by 72.7% on average. Significant negative correlations were detected between dimethachlon resistance levels and mycelial growth rate on PDA (r = -0.980, P = 0.021), and between resistance levels and lesion diameters on detached leaves of oilseed rape plants (r = -0.997, P = 0.002). These results have profound implications for assessing the potential risk for resistance development to dicarboximide fungicides in S. sclerotiorum.

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References

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