Anthocyanins and flavonols are secondary metabolites that can function in plant defence
against herbivores. In Arabidopsis thaliana, anthocyanin and flavonol biosynthesis are
regulated by MYB transcription factors. Overexpression of MYB75 (oxMYB75) in Arabidopsis
results in increasing anthocyanin and flavonol levels which enhances plant resistance to
generalist caterpillars. However, how these metabolites affect specialist herbivores has
remained unknown. Performance of a specialist aphid (Brevicoryne brassicae) was …

Figure S1. Overexpression of MYB75 in Arabidopsis increases anthocyanin
accumulation.(A) Overexpression of MYB75 (oxMYB75) results in purple veins against a
green background of the leaves when grown under short-day (8 h of light) conditions.(B)
deep-purple leaves as reported in Borevitz et al.(2000) are observed when oxMYB75 plants
grow under long-day (16 h of light) conditions.(C) Relative transcript abundance of MYB75
(mean±SE, n= 5) in undamaged WT and oxMYB75 plants grown under long day …