CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2020, Vol. 42 ›› Issue (3): 480-.doi: 10.19802/j.issn.1007-9084.2019145

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Effects of soybean as pre-cropping plant on occurrence of clubroot in oilseed rape


  1. 1. Institute of Plant Protection, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China; 2. Key Labora⁃tory of Integrated Pest Management on Crops in Southwest, Ministry of Agriculture, Chengdu 610066, China
  • Online:2020-06-28 Published:2020-06-08


To investigate the effects of soybean as previous crop on clubroot disease of oilseed rape, and to ex⁃plore new way for clubroot control, occurrence of oilseed rape clubroot was investigated on resting spores in rotating field. Root exudates of different previous crops on germination of resting spores of the pathogen Plasmodiophora brassicae were also tested by spore germination method. Results showed that soybean planting significantly reduced the occurrence and damage of clubroot on oilseed rape as succeeding crop, and resting spores in soil were also re⁃duced. The incidence and disease index were 34.00% and 19.26 respectively. Soil dormant spore content was 1.45× 106/g soil. These were significantly lower than those of rapeseed (71.33%, 50.15, 2.92 × 106/g soil), Chinese cab⁃bage (73.33%, 49.48, 2.68 × 106/g soil) and uncultivated field (70.67%, 48.00, 2.82 × 106/g soil) as previous crop or treatment. Root exudates of soybean, oilseed rape and Chinese cabbage stimulated resting spores germination of P. brassicae. After 6 days co-culture with root exudates, the germination rate of resting spores was 29.82% for soybean root exudates, which was significantly higher than those from Chinese cabbage (15.52%), oilseed rape (14.83%) and
blank nutrient solution (6.48%). Thus the mechanism of clubroot occurrence reduction by soybean pre-cropping plants might be preliminarily clarified as: soybean root exudates could stimulate resting spores germination of P. brassicae, and then lead to zoospores death due to lack of host plants, and consequently reduce the primary infection for succession crop rapeseed.

Key words: oilseed rape, clubroot disease, soybean, crop rotation, content of resting spores, root exudates

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