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| Effects of High Temperature and High Humidity on Seedling Growth of Different Ecotype Cucumber |
| TONG Peijiang☆，MENG Huanwen☆，PAN Yupeng，LIU Hanqiang，CHENG Zhihui* |
| College of Horticulture，Northwest A & F University，Yangling 712100，Shaanxi，China |
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Abstract Abstract：To explore the tolerance to hot and humid of different ecotype cucumber germplasm，an experiment of normal relative humidity（65%）and high relative humidity（95%）on 3 ecotype cucumber totally 39 cultivars was conducted under normal temperature．Another experiment of different high temperatures on 3 ecotype cucumber totally 6 cultivars was conducted under high relative humidity．The results showed that under normal temperature condition，high relative humidity treatment mainly promoted leaf area and decreased chlorophyll content（SPAD value），and resulted in relative larger differences；but presented less effect on top fresh and dry mass of seedling，compared to normal relative humidity．These differences were significant in cultivars and related to ecotype．Under high humidity condition，38-40 ℃ high temperatures mainly showed positive effects on seedling growth indexes of most cultivars in different ecotypes，while treatments of 44-46 ℃ mainly showed inhibition effects．The leaf area，top dry mass and root dry mass of seedling under 42 ℃ high temperature treatment can better indicate hot tolerance among cultivars．Therefore，42 ℃ /32℃（day/night）+95%（relative humidity）is suggested to be a parameter of temperature and humidity to identify cucumber tolerance to hot and humid．
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Received: 04 November 2022
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