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. 2021 Jul 30;8:683671. doi: 10.3389/fmolb.2021.683671

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Copyright © 2021 Schindler, Fragner, Herpell, Berger, Brenner, Tischler, Bellaire, Schönenberger, Li, Sun, Schinnerl, Brecker and Weckwerth.

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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Senescent leaves of Psychotria punctata show green nodules and higher photosynthetic activity in nodulated areas as compared to areas of leaf lamina. (A) Senescent leaf of P. punctata, showing still green nodules. (B) Visualisation of the chlorophyll fluorescence parameters of a senescent leaf of P. punctata analysed with an Imaging PAM mini fluorometer (Walz, Germany), maximal fluorescence in light adapted state (Fm’); red colour code indicates lower levels of fluorescence light in nodulated areas (marked by green arrow) and thus higher photosynthesis rates; circels indicate the area, where the light curves have been measured. Circle number 1 indicates non nodulated leaf area, numbers 2–5 nodulated leaf areas. (C) Picture of the corresponding senescent leaf of P. punctata. Black circles surround leaf nodules, D, diameter of leaf nodule; C, circumference; A, area. (D) Quantum yield of photosystem II during illumination (Y(II)); green colour code indicates higher quantum yield in nodulated leaf areas (red arrow).