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Effect of Put and B. thuringiensis IAGS 199 on proline content of C. annum under Cd stress. Values demonstrate means ± SD (n = 5). Different letters indicate significant difference among the treatments (p ≤ 0.05). C, control; Cd, 50 mg kg−1 Cd; Put, 1 mM Put; PGPB, B. thuringiensis IAGS 199.
