The percentage transmission at the end of a given light exposure (A, accumulation at 0

1 μmol photons m s; B, avoidance at 100 μmol photons m s) relative to the value at the end of the 4 h dark treatment () was plotted against chloroplast number per mesophyll cell (). All data for wild-type and mutant plants of ecotypes Columbia, Landsberg , and Wassilewskija (see ) were included except those for , , and the / double mutant. Regression lines were fitted through the data (accumulation: =–5.98–0.58; avoidance: =15.36 + 0.093). All regressions were highly significant ( Copyright information:Taken from " leaves with altered chloroplast numbers and chloroplast movement exhibit impaired adjustments to both low and high light"Journal of Experimental Botany 2008;59(9):2285-2297.Published online 8 May 2008PMCID:PMC2423661.