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. 1993 Feb;19(2):369-75.
doi: 10.1007/BF00993702.

Effects of root exudate sorgoleone on photosynthesis

F A Einhellig  1 , J A Rasmussen, A M Hejl, I F Souza
Affiliations

Effects of root exudate sorgoleone on photosynthesis

F A Einhellig et al. J Chem Ecol. 1993 Feb.

Abstract

The aim of this investigation was to determine if sorgoleone (SGL), ap-benzoquinone inSorghum bicolor root exudate, is a photosynthesis inhibitor. Assays usingGlycine max leaf disks showed concentrations as low as 10μM SGL inhibited oxygen evolution more than 50%. Tests conducted on chloroplasts isolated fromPisum sativum showed that SGL is a powerful inhibitor of CO2-dependent oxygen evolution. Using a chloroplast suspension equivalent to 80-100μg chlorophyll, the I50 was approximately 0.2μM SGL. These data indicate inhibition of photosynthesis is part of the explanation for growth reduction caused by this allelochemical.

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