Test for Photosystem II protection from UV radiation
To test the hypothesis that UV filtering would increase vulnerability to
UV damage at PSII, desiccated samples were also subjected to a
laboratory UV treatment, and Fv/Fm and
ΦPSII were measured during simulated winter recovery conditions. There
were no significant differences inF v/F m within each
treatment group (UV-filtered, UV-transmitted, and site reference) at
T0 and T192 after the laboratory UV
treatment (Figure S2). At T24, UV-transmitted field
plants that received a laboratory UV treatment had significantly higherF v/F m than UV-transmitted
that did not. Similarly, ΦPSII of each treatment group was not
significantly different after the laboratory UV treatment at
T0 and T192, but at T24was significantly higher in laboratory UV-treated UV-transmitted samples
than UV-transmitted with no laboratory UV treatment (Figure S3).