Figure 3.
CPD density per nanogram of DNA in leaves of G. magellanica plants as a function of the premidday effective UV dose (A–E); 1 unit of DNA damage is defined as the number of CPD produced by 1 J⋅m−2 of 254-nm radiation on 1 ng of purified DNA. Plants are from the full-UV treatment. (F) Relationship between the goodness of fit of the various “DNA damage/UV dose” correlations (A–E) and the radiation amplification factor (RAF) of the weighting function estimated for 30°N latitude, the month of July, and an ozone column of 305 DU (RAF data obtained from ref. 1 and S. Madronich, personal communication).