Fig. 7From: Heme is involved in the exogenous ALA-promoted growth and antioxidant defense system of cucumber seedlings under salt stressThe contents of endogenous ALA (A), Proto IX (B), Mg-Proto IX (C) and heme (D) in cucumber seedlings. Values were mean ± SE (n = 3). Bars with different lowercase letters were significantly different by Tukey’s multiple range test (P < 0.05)Back to article page