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Environmental Science and Pollution Research 2019-Feb

Alleviative role of exogenously applied mannitol in maize cultivars differing in chromium stress tolerance.

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Ume Habiba
Shafaqat Ali
Muhammad Rizwan
Muhammad Ibrahim
Afzal Hussain
Muhammad Shahid
Saud Alamri
Mohammed Alyemeni
Parvaiz Ahmad

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Abstracto

A pot experiment was performed to examine the role of foliar applied mannitol (M) in chromium (Cr) stress alleviation in different maize cultivars. Two maize cultivars, one tolerant (6103) and one sensitive (9108) to chromium stress, were grown in soil treated with three concentrations of Cr (0, 5, and 10 mg kg-1) and three levels of mannitol (0, 50, and 100 mg L-1). Chromium stress decreased the overall growth of plants by reducing the plant height, root/shoot dry weight, chlorophyll contents, and enzymatic activities, while exacerbated the severity of reactive oxygen species in both maize cultivars. Chromium-induced reduction in growth attributes of maize plants was relatively higher in sensitive cultivar than that of tolerant one. Uptake of Cr by the plants and its translocation from roots to shoots increased with increasing concentration in the soil. However, foliar application of mannitol significantly alleviated the Cr stress and improved growth, biomass, and photosynthetic pigments of maize plants. Mannitol also considerably reduced Cr contents in leaves and roots of both cultivars. Hence, it is concluded that mannitol can be helpful for crops grown on heavy metal, especially Cr, contaminated soils for remediation purpose.

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