Figure 1.

Effect of duration of hypoxic pretreatment on maize root tip tolerance to 13 h of anoxia. Intact seedlings were pretreated under hypoxia for various lengths of time, followed by 13 h of anoxia and 26 h of normoxia (see schematic, “Experimental plan”). Tolerance was assessed using root growth and root tip viability assays. Growth data are mean values ± se (n = 10). Viability data are aggregates of three independent experiments, from observations of a total of 30 seedlings for each point. Normoxic control seedlings of the same developmental age were exposed to 100% (v/v) O₂ only.