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| Evaluation of Several Resistance Inducers’ Control Effects on ZYMV in Watermelon |
| HAO Xiaoyuan1，LIU Zhuowen1，LIU Fengnan1，LIU Liming1，WU Huijie1，GU Qinsheng1，KANG Baoshan1，2* |
| 1Zhengzhou Fruit Research Institute，Chinese Academy of Agricultural Sciences，Henan Key Laboratory of Fruit and Cucurbit Biology，Zhengzhou 450009，Henan，China；2Zhongyuan Research Center，Chinese Academy of Agricultural Sciences，Xinxiang 453500，Henan，China |
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Abstract In order to explore plant immunoinducer with control effect to watermelon virus disease，taking zucchini yellow mosaic virus（ZYMV）as control object，plant pathogenicity and relative control efficiency as indicators，this paper evaluated 6 agents with different concentrations，including picolinic acid（Pip），N-hydroxy-picolinic acid（NHP），gallic acid，benzothiadiazole（BTH），chitosan，β-aminobutyric acid（BABA），and their two-agent and three-agent combinations for their control effects on this virus disease．The results showed that the control effect of single-agent on ZYMV in watermelon ranked from high to low as follows：NHP（0.5 mmol·L-1），Pip（2 mmol·L-1），chitosan（1 g·L-1），gallic acid（0.5 g·L-1），BABA（1 mmol·L-1），BTH（0.1 mmol·L-1）．In the combination agent experiment，the best control effect of the twoagent combination was 2- Ⅶ（NHP 0.5 mmol·L-1 + Pip 2 mmol·L-1）．Eleven days after inoculation，when incidence rate of the plant by control-treated water reached 100.00%，the incidence rate of the combinationtreated plants was 10.00%，and relative control effect was 89.99%．However，this combination agent would affect plant growth．The combination of 3 agents with better control effect were 3-Ⅰ（gallic acid 0.5 g·L-1 + NHP 0.5 mmol·L-1 + BABA 1 mmol·L-1）and 3- Ⅱ（gallic acid 0.5 g·L-1 + NHP 0.5 mmol·L-1 + Pip 2 mmol·L-1）．Their incidence rates were 27.27% and 33.33%，respectively，and their relative control effects were 79.49% and 68.27%，respectively，significantly higher than those of the other combinations．Among them，the incidence rate of the plants treated with 3-Ⅱ increased slowly，and disease control effect was more lasting than that of the other treatments．Thus，3-Ⅶ had the best control effect on ZYMV．The results indicate that NHP，Pip and gallic acid had potential application value in preventing watermelon virus diseases．
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Received: 27 July 2023
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MA Jianxiang，ZHANG Yong，LI Hao，WEI Chunhua，YANG Jianqiang，BAI Ruyi，SHEN Jian，WEN Ruiqi，FU Yuhang，WANG Xiang，YANG Tian，ZHANG Xian*. A New Watermelon F1 Hybrid —‘Nongkeda No.14’[J]. China Vegetables, 2024, 1(1): 121-123. |
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