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| Identification and Evaluation of New Watermelon Cultivar for Its Resistance to Fusarium Wilt by Artificial Inoculation Method |
| KANG Baoshan1，WU Huijie1，LI Chaohan2，BAI Erjun1，GU Weihong2，GU Qinsheng1* |
| 1Zhengzhou Fruit Research Institute，Chinese Academy of Agricultural Sciences，Zhengzhou 450009，Henan，China；2Horticultural Research Institute，Shanghai Academy of Agricultural Sciences，Shanghai Key Lab of Protected Horticultural Technology，Shanghai 201403，China |
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Abstract Watermelon Fusarium wilt，caused by Fusarium oxysporum f. sp. niveurn，is one of the severe soil-borne fungal diseases in watermelon industry．Breeding disease resistant cultivars is still an ideal approach for controlling this disease．However，when the newly bred cultivars are introduced into the other areas，their resistances are easily lost．Therefore，understanding the characteristics of resistance is helpful for cultivar popularization and application．In this study，8 watermelon cultivars were evaluated for their resistances against Fusarium oxysporum f. sp. niveum Race 1 by fungus soil inoculation method，and verified through molecular marker．The results showed that the 6 tested new watermelon cultivars expressed middle resistance to Fusarium oxysporum f. sp. niveum Race 1，matching with the testing results by molecular marker．Among them，the resistances of‘Shenxuan 958’，‘Shenmi 968’and‘Shenmi No.6’expressed bigger differences in 3 repeated experiments at different times，indicating their resistances were more sensitive to environment factors，especially temperature and humidity．‘Shenxuan 958’and‘Shenkang 988’had the same resistence-parent，their genotype tested by molecular marker was the same．But，under the same environment conditions，their resistances expressed larger differences，indicating that owing to different parents，there might existed different minor gene or gene interaction mode．
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Received: 13 January 2020
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