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. 2021 Apr 30;72(13):5066–5078. doi: 10.1093/jxb/erab187

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© The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 4. — Light–response curves. (A) Light–response curves measured under high humidity (HH; above, n=9–11) and low humidity (LH; below, n=4–7) showing the rate of photosynthesis in response to increasing radiation. A_sat reaches similar values under both growing conditions. Under LH, the pip2;5 mutant stands out, displaying 13% lower A_net compared with the wild type (WT). Pip2;4 showed the opposite trend, with 21% higher A_net compared with the WT. (B) Light–response curves measured under HH (above, n=9–11) and LH (below, n=4–7) showing g_s in response to increasing radiation. Under HH, g_s is clearly higher and much more stable over the entire range of irradiances. Under LH, pip2;5 displayed a much slower and 5% smaller response of g_s compared with the WT. Pip2;4 showed 19% higher g_s compared with the WT. Fitted means with the pooled SE at each measuring point under HH (open circles) and LH (filled circles) are given at the bottom of the graph.