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The SS and proline contents. The effects of salt stress (S) and alkali stress (A) on the SS and proline content in rhizomes, stems, roots, and leaves of L. chinensis. There are three levels under both stresses: 0, 100, and 200 mmol/L. The means and standard errors are reported. Within each column, the different letters indicate significant difference among treatments (P < 0.05).
