Figure 6.

Selected intermediates of photorespiration of plants grown under two different photoperiods. Shown are relative amounts of selected photorespiratory intermediates form air grown wild-type and hpr1 mutant plants in two photoperiods (SD—10/14 h day/night cycle, and LD—16/8 h day/night cycle) with otherwise equal conditions. Plants were grown to growth stage 5.1 [41] and metabolites determined at four diagnostic timepoints during the day/night cycle (end of night (EoN), mid of day (MoD), end of day (EoD) and mid of night (MoN)). Shown are means ± SD (five biological replicates) with the wildtype EoN time point was arbitrary set to 1. Asterisks show significant changes compared with the wild-type EoN timepoint, plusses indicate significant changes between SD and LD and rhombus indicate significant changes at the respective timepoint between the wild type and hpr1 according to Student’s t-test (** p < 0.01). The figure was redrawn, using data that were in part previously published [35], with permission (www.plantphysiol.org).