Figure 7.

Temperature dependence of photosynthesis in the ‘purple morph’ and ‘green morph’ of Zygogonium AUT and SCOT. (A) Gross and net photosynthetic O₂ production and respiratory consumption in response to increasing temperatures (0°C –45°C; n = 3 ± SD; SD values for net photosynthesis are excluded to increase legibility). (B) Gross photosynthesis: respiration (P:R) ratios. Significant temperature depended differences (lower case letters: gross photosynthesis, capital letters: respiration, lower case and cursive letters: P:R ratios) were determined by one-way ANOVA, followed by Tukey's post hoc test (P < 0.05). Significant different P:R ratios of the ‘purple morph’ and the ‘green morph’ of the same strain at the same temperature steps (underlined letters) were determined by standard two-sample t-tests (P < 0.05).