Abstract
AbstractThis study focused on the effect of different availabilities of mineral resources in hydroponic culture on the production of polyacetylenic defences of Rudbeckia hirta L. Specifically, we investigated if there was any difference concerning the amount of pentaynene, measured with high performance liquid chromatography (HPLC), produced in flowers of plants grown at high light intensity (500 µmol m−2 s−1 photosynthetic photon flux density) and two levels of mineral resources (full strength and 1/5 dilution) in a hydroponic solution. A working hypothesis was that the concentration of secondary compounds would increase with decreasing nutrient supply, in accordance with the carbon:nutrient balance hypothesis. The amount of pentaynene produced in the flowers of R. hirta decreased with increasing flower age but increased significantly when the plant was subjected to a reduced nutrient availability. The decrease in pentaynene concentrations with flower age was also less pronounced in the nutrient‐stressed plants.
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