ON THE COVER

Photosynthetic performance of poplar trees is strengthened after recovery from mild droughtheat stress scenarios simulating predicted future climate conditions of the temperate zones. Georgii et al. (pp. 346–367) have investigated the changes that transcriptomes of different organs and wood tissues undergo during stress and after recovery. While stress responses were similar between a periodic and a chronic stress scenario, post-recovery gene regulation was highly specific both for stress scenario and plant tissue. The few transcription factors with shared expression profiles across different tissues included two homologs of Arabidopsis HOMEOBOXLEUCINE ZIPPER PROTEIN 7 (HB7), which has been associated with an increased photosynthesis rate. The photo shows poplar trees in a plantation and was taken by Jo¨ rg-Peter Schnitzler, Helmholtz Zentrum Mu¨ nchen.