Fig. 3.

(A) Relationship between light intensity and NPQ, and the subsequent effect on qPd for 40 npq1 Arabidopsis intact leaves. Data points were taken during the fluorescence routine explained in Fig. 1. The figure key explains the greyscale relationship of symbols to qPd. (B) Relationship between NPQ, PSII actual yield (filled circles), and qPd (open circles). At each light intensity, NPQ and qPd data points were taken from A and averaged. Error bars show the SEM (n=40). The theoretical yield (continuous line) was calculated using Equation 1 of the Materials and methods.