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In this study, the possibility of enhancing cold stress tolerance of soybean plants (Glycine max L.) by exogenous application of 5-aminolevulinic acid (ALA) was investigated. ALA was added to the Hoagland solution at various concentrations ranging from 0 to 40μM for 12h. After ALA treatment, the plants were subjected to cold stress at 4°C for 48h. ALA at low concentrations (5–10μM) provided significant...
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