Journal of Chemical Ecology

, Volume 38, Issue 2, pp 195–203

Influence of Phenological Stage on Swainsonine and Endophyte Concentrations in Oxytropis sericea

Authors

    • Poisonous Plant Research Laboratory, Agricultural Research ServiceUnited States Department of Agriculture
  • Lei Shi
    • Poisonous Plant Research Laboratory, Agricultural Research ServiceUnited States Department of Agriculture
  • Dale R. Gardner
    • Poisonous Plant Research Laboratory, Agricultural Research ServiceUnited States Department of Agriculture
  • James A. Pfister
    • Poisonous Plant Research Laboratory, Agricultural Research ServiceUnited States Department of Agriculture
  • Daniel Grum
    • Poisonous Plant Research Laboratory, Agricultural Research ServiceUnited States Department of Agriculture
  • Kevin D. Welch
    • Poisonous Plant Research Laboratory, Agricultural Research ServiceUnited States Department of Agriculture
  • Michael H. Ralphs
    • Poisonous Plant Research Laboratory, Agricultural Research ServiceUnited States Department of Agriculture
Article

DOI: 10.1007/s10886-012-0067-0

Cite this article as:
Cook, D., Shi, L., Gardner, D.R. et al. J Chem Ecol (2012) 38: 195. doi:10.1007/s10886-012-0067-0

Abstract

Locoweeds are defined as Astragalus and Oxytropis species that cause intoxication due to the alkaloid swainsonine. Swainsonine concentrations in Oxytropis sericea were influenced by location, plant part, and the developmental stage of the plant. Concentrations followed similar trends at each location, generally increasing over the growing season in above-ground parts until the plant reaches maturity with no change in concentration in the crowns. At the onset of senescence, swainsonine decreased in floral parts to less than half of the peak concentration. Similar to swainsonine concentrations, endophyte amounts were influenced by location, plant part, and the developmental stage of the plant. Likewise, endophyte amounts generally increased over the growing season in above ground parts and remained static in the crowns at all four locations. Swainsonine in Oxytropis sericea was positively associated with the endophyte Undifilum, which is responsible for swainsonine biosynthesis.

Keywords

LocoweedAstragalusOxytropisSwainsonineUndifilumEndophytePhenology

Supplementary material

10886_2012_67_MOESM1_ESM.doc (70 kb)
ESM 1(DOC 69 kb)

Copyright information

© Springer Science+Business Media, LLC (outside the USA) 2012