Effects of root exudate sorgoleone on photosynthesis
The aim of this investigation was to determine if sorgoleone (SGL), a p-benzoquinone in Sorghum bicolor root exudate, is a photosynthesis inhibitor. Assays using Glycine max leaf disks showed concentrations as low as 10 μM SGL inhibited oxygen evolution more than 50%. Tests conducted on chloroplasts isolated from Pisum sativum showed that SGL is a powerful inhibitor of CO2-dependent oxygen evolution. Using a chloroplast suspension equivalent to 80-100 μg chlorophyll, the I50 was approximately 0.2 μM SGL. These data indicate inhibition of photosynthesis is part of the explanation for growth reduction caused by this allelochemical.
allelochemical, allelopathy, chloroplast, photosynthesis, root exudate, Sorghum bicolor, Sorgoleone
Einhellig, Frank A., James A. Rasmussen, Angela M. Hejl, and Itamar F. Souza. "Effects of root exudate sorgoleone on photosynthesis." Journal of chemical ecology 19, no. 2 (1993): 369-375.
Journal of Chemical Ecology