Fig. 7.

Schematic diagram showing the mechanisms of plant adaptive responses to partial (PS) and full (FS) root zone drought stress methods used in this study. Red and blue solid arrow lines indicate PS and FS individuals’ responses respectively. Red and blue dotted arrow lines with upward and downward arrow directions indicate the higher and lower responses of respective compounds between the two drought stress methods. ROS reactive oxygen species; ABA abscisic acid; ZR cytokinin; WUE water use efficiency; HI harvest index