Defoliated ragwort plants produced regrowth foliage that was higher in alkaloid, but lower in amino acid concentrations than primary foliage. Total N was not affected. 2) Plants fertilized with nitrogen (as ammonium sulphate) had lower amino acid concentrations than unfertilized control plants,
Abiotic and biotic properties of soil can influence growth and chemical composition of plants. Although it is well-known that soil microbial composition can vary greatly spatially, how this variation affects plant chemical composition is poorly understood. We grew genetically identical Jacobaea
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