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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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