Figure 3.

Comparison of mature and young sun leaves during long-term acclimation to shade (experiment 3). An avocado tree was exposed to sun for 30 d to establish full sun acclimation of mature (m; black symbols) leaves and to produce new, young sun leaves (y; 11–15 cm in length; white symbols) that expanded to the same size as mature leaves during the experiment. Transfer to shade (gray area) occurred on day 0, and shade acclimation responses of carotenoid pigment pools were examined at intervals (6 am samples) over 43 d. Values are means ± se (n = 4).