Comparative study of seed germination and growth of Kochia prostrata and Kochia scoparia (Chenopodiaceae) under salinity |
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Authors: | NS OrlovskyUN Japakova I ShulginaS Volis |
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Institution: | a Institute for Agriculture and Biotechnology of Drylands, Ben-Gurion University of the Negev, 84990 Midreshet Ben-Gurion, Israel b Life Sciences Department, Ben-Gurion University of the Negev, POB 653, Beer Sheva 84105, Israel c Botany Institute, Academy of Sciences of the Republic of Uzbekistan, 32 F. Khodjaev str., 700143 Tashkent, Uzbekistan |
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Abstract: | Soils of arid regions of Central Asia contain salts of different types that may differentially affect seed germination and plant development. We studied effect of NaCl, Na2SO4, 2NaCl + KCl + CaCl2 and 2Na2SO4+K2SO4+MgSO4 on germination of Kochia prostrata and Kochia scoparia seeds under a range of concentrations from 0.5 to 5% and at two constant temperature regimes +22 °C and +6 °C. The observed salt tolerance limit of germination at constant temperature +22 °C for both species was 5-6%, while at low temperature (+6 °C) this limit was 2%. The salt tolerance of young plants (before flowering) was 3% for NaCl. Low concentrations of sulfuric and mixed salts had a stimulating effect on seed germination in K. prostrata. Despite similarity of salt-tolerance limits the studied species showed a significant difference in seed recovery ability, i.e. the ability of ungerminated, salt-soaked seeds to germinate after transfer to fresh water. K. scoparia demonstrated a full germination recovery after seed transfer to distilled water while K. prostrata showed only a partial recovery. |
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Keywords: | Constant temperature Germination Halophyte Kochia prostrata Kochia scoparia Recovery Salt tolerance |
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