Figure 4. Mean foliage ABA conjugate levels (n=3, ±SE) in leaves taken from branches that were intact (white) or girdled (black) from plants of the angiosperm species Umbellularia californica (A) and conifer species Callitris rhomboidea (B) prior to drought stress (pre-stressed), at peak ABA levels (peak) and 10 d after peak ABA levels (post-peak). Different letters denote significant differences (P<0.05) in mean ABA-GE levels.