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. 2021 May 24;12:596943. doi: 10.3389/fpls.2021.596943

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Copyright © 2021 Kusuma and Bugbee.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The response of green (closed circles) and photobleached (open circles) seedlings to models of PPE in specific leaf layers, using the same models as Figures 7, 8. See Figure 5 for an explanation of colors. Estimates of PPE are calculated using green or etiolated weighting factors. The green and photobleached seedlings from a single spectral treatment were combined for analysis. Panels (A) through (C) use estimates of PPE based on the two-state model for phytochrome that is (A) above the leaf, (B) in epidermal tissue or (C) homogeneously distributed in the whole cotyledon. Panels (D,E) use estimates of PPE based on the three-state model for phytochrome that is (D) in epidermal tissue or (E) homogeneously distributed in the whole cotyledons. All models use linear regression with the exception of (E), which fits the date with exponential decay functions. Each point represents an average of 6–9 seedlings. There were four replications in time.