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Variable fluorescence (OJIP curve) of WT Arabidopsis (col) and over expressors of plastidial transglutaminase (OE TGase). (A) Fluorescence induction curves normalized to Fo values for WT and OE TGase. (B) Variable fluorescence curves in DCMU inhibited leaves. Reaction centers close at a slower rate in OE TGase (i.e., lower values of fluorescence) indicating that the absorption cross section of PSII is smaller. For a quantitative estimation of antenna size see also Table 1.
