Cover illustration: Trichomes are deformed and fluoresce after exposure to phenanthrene, a three-ring polycyclic aromatic hydrocarbon and common environmental pollutant. Leaves from 21-d-old Arabidopsis plants grown on medium containing 0 (top) or 0.25 mM (bottom) phenanthrene were visualized with a fluorescence microscope. Bottom image shows UV fluorescence of an abnormally branched trichome. No such fluorescence is seen in the normal, triple-branched trichome in the absence of phenanthrene (top). (See Alkio et al., pp. 2983–2994.)
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