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Effect of exogenous citric acid on root activity under control (25/20 ± 0.5°C, day/night) and heat stressed (35/30 ± 0.5°C, day/night) conditions in tall fescue. Vertical bars on the top provide the standard deviation (n = 4), and bars with the same letter indicate no significant difference at P < 0.05 for the comparison of different citric acid concentrations under control or heat stress.
