Zinc hyperaccumulation in Thlaspi caerulescensas a chemical defence against herbivoryABSTRACTThlaspi caerulescens is one of several plant species known toaccumulate heavy metals in excess of 2% of their above ground plantbiomass. The reasons for hyperaccumulation are unknown, butseveral studies conclude that it may be a plant chemical defence.This has been of interest to biologists because these metals areusually toxic. The accumulation of these metals may serve as amodel for coevolution. We examined the effects of zinchyperaccumulation in Thlaspi on Xanthomonas campestris and foundthat the plants containing zinc thrived when inoculated with thisbacteria, while plants not containing zinc showed signs ofdeterioration.INTRODUCTIONThere are several wild plant species that have the ability toaccumulate high quantities of heavy metals in their above groundbiomass, up to three percent or more. Many of these plants arefound in the Brassicaceae family throughout Europe and the BritishIsles. These plants thrive on mineral outcrops with calamine andserpentine soils rich with high levels of ......

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