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Growth Response and Changes of Nitrate and Sucrose Content in Tomato under Salt Stress Condition  

Lee, Ju-Young (NIAST, Rural Development Adminstration)
Jang, Byoung-Choon (NIAST, Rural Development Adminstration)
Lee, Su-Yeon (NIAST, Rural Development Adminstration)
Park, Jae-Hong (NIAST, Rural Development Adminstration)
Choi, Geun-Hyoung (NIAST, Rural Development Adminstration)
Kim, Sam-Cwaun (NIAST, Rural Development Adminstration)
Kim, Tae-Wan (Department of Plant Life and Environmental Science, Hankyong National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.41, no.3, 2008 , pp. 164-169 More about this Journal
Abstract
This experiment was carried out to find the growth response and changes of nitrate and soluble sugar content in tomato leaves with salt stress. Tomato (Solanum lycopericum) seedlings were grown under different electrical conductivity (EC) levels adjusted with $CaCl_2$ as 1, 2, and $6dS\;m^{-1}$. The growth response and contents of nitrate and soluble sugar in tomato plants were examined at 7 and 14 days after salt treatment. Leaf area and dry weight ratio of shoot to root of tomato plants were decreased as EC level increased. Photosynthetic rate of leaves was reduced under high EC level due to the stomatal closure and the reduction of transpiration rate. The soluble sugar and starch content were lower in the tomato leaves grown under high EC level. Total nitrogen and nitrate contents were decreased in high EC level, whereas the ammonium content was increased. High-salt stress induced the accumulation of salt crystal in mesophyll cells of tomato leaf.
Keywords
Salt stress; Nitrate; Photosynthesis; Carbohydrate; Tomato;
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