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Alterations in organic osmolyte levels, proline (a), total soluble sugar (b), glycine betaine (c) contents in the leaves of Heliotropium thermophilum growing in soil at 20 ± 5 °C, 40 ± 5 °C, 60 ± 5 °C and 80 ± 5 °C. Vertical bars represent standard deviations of the means of three replicates. Different letters denote significant differences among all treatments at P < 0.05
