RT Journal Article
SR Electronic
A1 Perera-Castro, A. V.
A1 Brito, P.
A1 González-Rodríguez, A. M.
T1 Changes in thermic limits and acclimation assessment for an alpine plant by chlorophyll fluorescence analysis: F&lt;sub&gt;v&lt;/sub&gt;/F&lt;sub&gt;m&lt;/sub&gt;vs. R&lt;sub&gt;fd&lt;/sub&gt;
JF Photosynthetica
YR 2018
VO 56
IS 2
SP 527
OP 536
DO 10.1007/s11099-017-0691-6
UL https://ps.ueb.cas.cz/artkey/phs-201802-0008.php
AB A comparison between maximum quantum yield of PSII photochemistry (F&lt;sub&gt;v&lt;/sub&gt;/F&lt;sub&gt;m&lt;/sub&gt;) and chlorophyll fluorescence decrease ratio (R&lt;sub&gt;fd&lt;/sub&gt;) for low and high temperature resistance was assessed in a seasonal study of the acclimation in Pterocephalus lasiospermus. Analyzing the regression adjustment of both parameters and the lethal temperatures (LT&lt;sub&gt;50&lt;/sub&gt;), R&lt;sub&gt;fd&lt;/sub&gt; resulted in being a more sensitive indicator for low and high temperature treatments, since the thermic resistance estimated with R&lt;sub&gt;fd&lt;/sub&gt; parameter was never higher than those estimated with F&lt;sub&gt;v&lt;/sub&gt;/F&lt;sub&gt;m&lt;/sub&gt;. Furthermore, the use of F&lt;sub&gt;v&lt;/sub&gt;/F&lt;sub&gt;m&lt;/sub&gt; led to an overestimation of the acclimation phenomena, with 6ºC of a maximum difference between both parameters. Using R&lt;sub&gt;fd&lt;/sub&gt; as the indicator parameter, P. lasiospermus acclimated to low temperatures but it kept on being a sensitive species (the lowest LT&lt;sub&gt;50&lt;/sub&gt; values only achieved-9.9 ± 0.3ºC). bserved (LT&lt;sub&gt;50&lt;/sub&gt; around 43.5ºC). Thus, according to R&lt;sub&gt;fd&lt;/sub&gt; evaluation of the thermic threshold, this species could be in risk of damage at low temperatures in this alpine ecosystem.