title: Effects of root exudate sorgoleone on photosynthesis.
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.
authors.affiliation: Department of Biology, University of South Dakota, 57069, Vermillion, South Dakota.
authors.forename: F A
authors.initials: FA
authors.lastname: Einhellig
authors.forename: J A
authors.initials: JA
authors.lastname: Rasmussen
authors.forename: A M
authors.initials: AM
authors.lastname: Hejl
authors.forename: I F
authors.initials: IF
authors.lastname: Souza