Effects of root exudate sorgoleone on photosynthesis

Abstract

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.

Document Type

Article

DOI

https://doi.org/10.1007/BF00993702

Keywords

allelochemical, allelopathy, chloroplast, photosynthesis, root exudate, Sorghum bicolor, Sorgoleone

Publication Date

2-1-1993

Journal Title

Journal of Chemical Ecology

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