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| Effect of Water Stress on Physiological Characteristics of Potato Cultivars with Different Maturities |
| YAN Wenyuan☆，QIN Junhong☆，DUAN Shaoguang，XU Jianfei，JIAN Yinqiao，JIN Liping，LI Guangcun* |
| Key Laboratory of Biology and Genetic Breeding of Tuber Crops，Ministry of Agriculture and Rural Affairs，Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China |
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Abstract In order to clarify the impact of soil water deficit on growth and development of potato cultivars with different maturities，this paper conducted pot experiment and studied the effects of 4 soil relative water content regimes（W1，75%-85%；W2，55%-65%；W3，35%-45%；W4，15%-25%）on plant height，relative chlorophyll content，fresh weight of organs，photosynthetic characteristics，yield and water use rate of 7 potato cultivars with different maturities．The results indicated that under all water stress the average falling ranges of plant height and intercellular CO2 concentration of early-maturing varieties were greater than
that of the late-maturing varieties．Under severe drought stress（soil relative water content 15%-25%）the average declining ranges of tuberization number and yield of single plant in early-maturing varieties were all greater than that of the late-maturing varieties；while，the average falling ranges of net photosynthetic rate，transpiration rate and stomatal conductance were all less than that of the late-maturing varieties．Considering various indicators，both early-maturing and late-maturing varieties could be planted under light and moderate drought stress（soil relative water content 35%-85%）．Late-maturing potato varieties were more suitable to be cultivated under severe drought stress．
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Received: 18 July 2021
Published: 16 November 2021
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