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| Identification of Hot-humid Tolerance of Different Ecotype Cucumber Cultivars |
| TONG Peijiang1，XU Wenjun2，PAN Yupeng1，LIU Hanqiang1，MENG Huanwen1*，CHENG Zhihui1* |
| 1College of Horticulture，Northwest Agricultural & Forestry University，Yangling 712100，Shaanxi，China；2Inner Mongolia Zhongtian Science and Technology Co.，Ltd.，Hohhot 010020，Inner Mongolia，China |
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Abstract Aiming at the scientific and industrial issues including no systematic identification for humidity resistance of cucumber varieties，restriction for humidity breeding，and choice for producing varieties，this study carried out identification on humidity resistance of 71 cucumber varieties from 3 ecotypes by using identification method established earlier．The results showed that the humidity resistance values of these experimental varieties were between 1.940-3.084．Among them，the humidity resistance values of 3 varieties were lower than 2.0，showing extrame sensitive to humidity. There were 16 varieties with humidity resistance values between 2.0-2.4，showing sensitive to humidity．There were 46 varieties with humidity resistance values between 2.4-3.0，showing resistance to humidity．There were 6 varieties with humidity resistance values higher than 3.0，showing extreme resistance to humidity．These 71 varieties were divided by clustering analysis into 3 groups at 15 european distance，namely humidity resistance type，more resistant to humidity type，and not resistant to humidity type．Generally speaking，varieties of european greenhouse type are mainly resistant to humidity，but there are still varieties not resistant to humidity．Varieties of South China type are mainly more resistant to humidity，but there are also varieties resistant and not resistant to humidity．Varieties of North China type are mainly not resistant to humidity，but there are still varieties more resistant or resistant to humidity．These results can provide direct evidences for material selection in cucumber humidity resistance breeding，and selection of production varieties in cucumber cultivation under humidity environment．
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Received: 18 September 2023
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