Differences in CTK/ABA production between genotypes under K+ deficiency stress
Low K+ sensitive JZ18 tomatoes and low K+ tolerant JZ34 tomatoes (Zhao et al. 2018) were measured to show differences in CTK and ABA contents under K+ deficiency stress (Fig. 8). Under K+-deficiency stress, the CTK contents of JZ34 were significantly higher than those of JZ18 as treatment time increased (Fig. 8a). However, under normal conditions, the CTK contents were lower in JZ34 plants than in JZ18 plants. Under K+deficiency stress, the ABA contents of JZ34 were also significantly higher than those in JZ18 as treatment time increased (Fig. 8b). Thus, CTK/ABA contents both increased in low K+ tolerant JZ34 plants under K+ deficiency stress.