Effect of salinity and soil temperature on the growth and physiology of drip-irrigated rice seedlings |
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Authors: | Ruxiao Bai Lin Chen Xinjiang Zhang Guohua Wei |
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Institution: | 1. Key Lab of Oasis Ecology Agriculture of Xinjiang Production and Construction Group, Shihezi University, Shihezi, P. R. China;2. Tianye Agriculture Research Institute, Tianye Group Ltd. of Xinjiang, Shihezi, P. R. China |
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Abstract: | Drip irrigation offers potential for rice (Oryza sativa L.) production in regions where water resources are limited. However, farmers in China’s Xinjiang Province report that drip-irrigated rice seedlings sometimes suffer salt damage. The objective of this study was to learn more about the effects of soil salinity and soil temperature on the growth of drip-irrigated rice seedlings. The study consisted of a two-factor design with two soil salinity treatments (0 and 1.8 g kg?1 NaCl) and three soil temperature treatments (18°C, 28°C and 36°C). The results showed that shoot biomass, root biomass and root vigor were greatest when seedlings were grown with no salt stress (0 g kg?1 NaCl) at 28°C. Moderate salt stress (1.8 g kg?1 NaCl) combined with high temperature (36°C) significantly reduced root and shoot biomass by 39–53%. Moderate salt stress and high temperature also increased root proline concentration by 77%, root malonyldialdehyde concentration by 60% and seedling mortality by 60%. Shoot and root Na+ concentrations, shoot and root Na+ uptake and the Na+ distribution ratio in shoots were all the greatest when moderate salt stress was combined with high temperature. In conclusion, high soil temperature aggravates salt damage to drip-irrigated rice seedlings. Therefore, soil salinity should be considered before adopting drip-irrigation for rice production. |
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Keywords: | Oryza sativa drip irrigation salt stress soil temperature interaction |
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