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Within- and between genotype variation in leaf iridoid glycoside (IG) concentrations in 13 Plantago lanceolata genotypes, ranked according to increasing genotype mean IG. (a) IG values from mixed leaf samples of each genotype taken at 4-wk intervals, two times during (circles) and one time after (diamond) the generalist feeding trials. (b) Mean values per genotype from samples taken before (open circles) and after diapause of specialists (closed circles), 10 months later
