Journal
JOURNAL OF CHEMICAL ECOLOGY
Volume 29, Issue 10, Pages 2263-2279Publisher
KLUWER ACADEMIC/PLENUM PUBL
DOI: 10.1023/A:1026222414059
Keywords
allelopathic correlation; wheat root exudate; production dynamics; benzoxazinones; phenolic acids; allelochemicals; synergism; GC/MS/MS
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An improved allelopathic correlation between phytotoxicity measured in root growth bioassay upon annual ryegrass ( Lolium rigidum Gaud.) and the concentrations of a selection of dynamically produced allelochemicals quantified in the root exudates of cv. Khapli wheat ( Triticum turgidum ssp. durum (Desf.) Husn.) monitored during the first 15 days of wheat seedling growth in a sterile, agar - water medium, has been established. Changes over the 15-day growth period in the quantities of five exuded benzoxazinones and seven phenolic acids were measured simultaneously using GC/MS/MS. Substantiating pure compound dose - response measurements were conducted over a range of concentrations for the putative allelochemicals within the wheat exudates. One synergism-based proposal using the monitored compounds to explain the observed low-exudate-concentration phytotoxicity was explored, but was found to be experimentally inadequate.
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