Fig. 4

Phenotype of maize OsMYB55 transgenic plants subjected to drought and heat stress. Five-week old wild type (WT) and over-expression plants (P1, P4, P5) were grown under a control conditions, b water withholding, c high temperature (42 °C / 35 °C) or d subjected to water withholding and high temperature as described in methods. Picture was taken five days after treatments. Control plants were watered and maintained at normal temperatures (29 °C / 23 °C) during the experiment. e Relative water content at the end of the treatment. f Malondihaldehyde (MDA) accumulation in leaves as indication of stress-induced oxidative damage. Bars represent mean values ± SE (n = 6). P-values (Student’s t-test) are indicated: **P < 0.005 and *P < 0.05