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Response of root respiration, R r, of Pima cotton to chronic exposure to a range of low to moderate O3 in the CHRONIC/GASEX experiment, in leaves treated with MeJA (+MeJA; 160 μg plant−1; filled symbols, solid lines) or untreated (–MeJA; open symbols, dashed lines). Points associated with the same letter within a line do not differ (P < .05). The effect of MeJA was highly significant (P < 0.01; Table 1).
