Abstract
Ferulic acid (FA), p-coumaric acid (pCA) and vanillic acid (VA) were tested to establish threshold levels required for inhibition of sorghum seed germination. An equimolar combination of 3.3 × 10 −3 M of each of the 3 phenolics showed synergistic inhibition of germination. This combination of the three also depressed germination more than any combination of two of these phytotoxins. Shoot elongation in germinating sorghum was depressed by 3.3 × 10 −3M of either FA or pCA, but not VA. At the concentrations used in combination experiments, VA seemed to antagonize some of the inhibition of FA and pCA on shoot elongation.
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