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Effects of Salt Stress on Germination Percentage and Seedling Growth in Sweet Sorghum Cultivars

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Author(s): A. Almodares | M.R. Hadi | B. Dosti

Journal: Journal of Biological Sciences
ISSN 1727-3048

Volume: 7;
Issue: 8;
Start page: 1492;
Date: 2007;
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Keywords: seed germination | salinity | Sweet sorghum | seedling growth

ABSTRACT
In this study, the response of sweet sorghum genotypes to salinity during germination and seedling growth stages were evaluated as possible indicators of the salinity tolerance of sweet sorghum cultivars. The degree of salinity tolerance among four sweet sorghum cultivars (Soave, Rio, Sofra and Keller) was evaluated, at seed germination and seedling growth stages, using four different salt concentrations (0, 100, 200 and 300 mM NaCl). The results showed that in all cultivars as the salt concentration increased, seed germination decreased significantly. For all salt concentrations, Soave had the highest germination percentage. Sofra did not germinate at 200 and 300 mM NaCl. Therefore, at germination stage, Soave has the highest tolerance to salt while Sofra has the lowest resistance to salinity. In addition, results were similar at both the seedling and germination stages. Salt concentration decreased fresh seedling weight. At the seedling stage, Soave and Sofra had the lowest and the highest percentage reduction of fresh seedling weight, respectively. Tests indicate that for the best results, at seedling germination and growth stages, Soave is the cultivar to be recommended for soils with high salinity.
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