Abstract:
:Oxytropis lambertii has been considered to be one of the major locoweeds responsible for livestock poisoning on rangelands, but there has been much confusion as to its taxonomic identity. The objective of this study was to conduct a field survey of several populations of each of the three varieties [var. lambertii Pursh; var higelovii A. Gray; var. articulata (E. Greene) Barneby] to document the presence or absence of the locoweed toxin, swainsonine. Swainsonine was found at detectable levels (>0.001% dry weight) in only five populations of var. higelovii in the southwest portion of its distribution in southern Utah, Arizona, and southwestern New Mexico, USA. No swainsonine was detected in populations in the northeast areas of its distribution (eastern Utah, Colorado, northeastern New Mexico, USA). The other varieties, articulata and lambertii, also did not contain swainsonine. It is suspected that a plant fungal endophyte may be responsible for the high variability in swainsonine content in populations of O. lambertii.
journal_name
J Chem Ecoljournal_title
Journal of chemical ecologyauthors
Ralphs MH,Welsh SL,Gardner DRdoi
10.1023/a:1015228507950keywords:
subject
Has Abstractpub_date
2002-04-01 00:00:00pages
701-7issue
4eissn
0098-0331issn
1573-1561journal_volume
28pub_type
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