Chen
et al. (2012) subjected the cvs. ‘Brigitta’, ‘Misty’ and ‘Sharpblue’ to
heat stress conditions and observed that the most susceptible cvs.
showed decreases in max; maximum photochemical quantum yield of photosystem II, normally observed after dark-acclimation (Fv/Fm) and the quantum efficiency of PSII(ФPS
II) and increased Basic chlorophyll fluorescence yield recorded with low Measuring Light intensities parameters, together with an increase in ROS.
Reyes-Díaz et al. (2010) used fluorescence measurements to determine
the resistance to aluminum (Al) in ‘Legacy’ and ‘Bluegold’,
and found that max; maximum photochemical quantum yield of photosystem II, normally observed after dark-acclimation (Fv/Fm) showed no significant differences between
Al treatments, while electron transport rate and ФPS II drastically decreased in ‘Bluegold’
(cv. susceptible), whereas in ‘Liberty’ (cv. resistant) they did not vary.