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| Salt Tolerance Indexes Screening of Different Cucumber Cultivars at Seedling Stage and Construction of Its Evaluation System |
| MEN Li-zhi，WANG Yi，CAO Yun-e，CHEN Qing-yun，TIAN Yong-qiang，GAO Li-hong * |
| Beijing Key Laboratory of Growth and Development Regulation for Protected Vegetable Crops，College of Agronomy & Biotechnology，China Agricultural University，Beijing 100193，China |
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Abstract This study was conducted to compare differences in salt tolerance of different cucumber（Cucumis sativus L.）cultivars and to construct the measuring system for evaluating identification indexes of salt tolerance in cucumber seedlings．Cucumber seedlings were allowed to grow in substrate
prepared from a mixture of sand and perlite，and then hydrated with half-strength Horticulture nutrient solutions containing different salt concentrations．Cluster analysis was performed to explore the possible similarities in salt-tolerance of 15 tested cucumber cultivars，using data of the leaf salt injury
index．Furthermore，principal components analysis was adopted to measure the proportion taken by each growth-or biomass-index in the salt tolerance evaluation system．The results showed that root dry weight，strong seedling index and the root/shoot ratio could well reflect the cucumber seedlings’response to salt stress，which could also be taken as index for evaluating cucumber seedlings’salt tolerance.Based on this result，cucumber cultivars were separated into 5 groups，i.e.，cucumber cultivars highly resistant to salt-stress（i.e‘Lyuguan No. 1’and‘Ningxingoumeishuiguohuanggua’），cucumber cultivars resistant to salt-stress（i.e.‘Zhongnong No. 12’，‘Zhongke 958’，'Helanminihuanggua’，‘Zhongnong No. 21’and‘ Zhongnong No. 16’），cucumber cultivars relatively sensitive to salt-stress（i.e.‘Jinyou No. 1’，‘Yousheng’and‘Zhongnong No. 8’），cucumber cultivars sensitive to salt-stress（i.e.‘ Jingpengmici’and‘Xin No. 4’）and cucumber cultivars highly sensitive to salt-stress（i.e.‘Chunpeng No. 5’，‘Lyuyou’and‘Zhongnongda No. 41’）．
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Received: 03 May 2013
Published: 01 August 2013
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