Archived data for the manuscript "Acclimation and de-acclimation of photosystem heat tolerance of alpine plants in response to multiday heat exposure in the field".

An in situ warming experiment exploring the acclimation and recovery of the photosystem heat tolerance trait Tcrit during a 6 day heat treatment and 6 days recovery. We established field plots and selected eight species (graminoids, herbs, and shrubs) to compare unheated plots to heated plots in an Australian alpine grassy herbfield. We actively heated chambers with convective heaters to target day/night temperatures of 32/22°C. Leaves for photosystem heat tolerance assays were sampled daily for six days during heat treatments and six days post-heating. We used chlorophyll fluorescence imaging to derive the critical temperature for photosystem II disruption to function (Tcrit) by heating leaves up to 70°C