Fig. 3
Spatial changes in the maximum efficiency of photosystem II (Fv/Fm) of Arabidopsis lyrata ssp. petraea seedlings. Images represent the recovery of Fv/Fm in a single representative plant 2, 5 and 16 days after − 9 °C treatment (false colour imaging) from the Irish (Leitrim) and Norwegian (Helin) populations. Prior to sub-zero treatment, plants were exposed to 2 °C for 2 days