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Levels of glycine betaine (GB) in the leaves of wild-type (WT) plants and three codA-transformed tomato lines (L2, L3, and L4). Plants were treated under normal or low-phosphate stress conditions for 15 days. Values represent the means ± SD of four replicates. Asterisks indicate significant differences compared with WT plants (Student’s t-test). FW, fresh weight; ∗P < 0.05; ∗∗P < 0.01.
