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Proline accumulation in leaves (A) and roots (B) of Carrizo and Cleopatra plants subjected to drought (WS), heat (HS), and a combination of drought and heat stress (WS+HS). Different letters denote statistical significance at p ≤ 0.05. G, genotypes; S, stress treatment; G×S, interaction genotype × stress treatment. ∗P < 0.05; ∗∗P < 0.01; ∗∗∗P < 0.001; ns, no statistical differences.
