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 micromolar SGL inhibited oxygen evolution more than 50%. Tests conducted on chlo...

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Veröffentlicht in:	Journal of chemical ecology 1993-02, Vol.19 (2), p.369-375
Hauptverfasser:	Einhellig, F.A, Rasmussen, J.A, Hejl, A.M, Souza, I.F
Format:	Artikel
Sprache:	eng
Schlagworte:	Agronomy. Soil science and plant productions ALELOPATIA ALLELOPATHIE Biological and medical sciences CHLOROPLASTE CLOROPLASTO COMPOSICION QUIMICA COMPOSITION CHIMIQUE Economic plant physiology EXSUDAT EXUDADOS FOTOSINTESIS Fundamental and applied biological sciences. Psychology GLYCINE MAX INHIBIDORES DE ENZIMAS INHIBITEUR D'ENZYME Net assimilation, photosynthesis, carbon metabolism. Photorespiration, respiration, fermentation (anoxia, hypoxia) Nutrition. Photosynthesis. Respiration. Metabolism PHOTOSYNTHESE PISUM SATIVUM QUINONAS QUINONE RACINE RAICES SORGHUM BICOLOR
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Zusammenfassung:	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 micromolar SGL inhibited oxygen evolution more than 50%. Tests conducted on chloroplasts isolated from Pisum sativum showed that SGL is a powerful inhibitor CO2-dependent oxygen evolution. Using a chloroplast suspension equivalent to 80-100 microgram chlorophyll, the I50 was approximately 0.2 micromolar SGL. These data indicate inhibition of photosynthesis is part of the explanation for growth reduction caused by this allelochemical
ISSN:	0098-0331 1573-1561
DOI:	10.1007/bf00993702