Genetic Diversity of Populations of Astragalus oniciformis Using Inter-Simple Sequence Repeat (ISSR) Markers
Alexander JA. 2001. Genetic Diversity of Populations of Astragalus oniciformis Using Inter-Simple Sequence Repeat (ISSR) Markers. Oregon State University
Astragalus oniciformis Barneby is a xerophyte of the sagebrush deserts of central Idaho. It is a narrow endemic of the upper Snake River Plains where it inhabits stabilized, aeolian sand deposits over Quaternary basalt flows. The objective of this study was to determine the levels and distribution of genetic differentiation within and among populations of Astragalus oniciformis. Fifteen individuals from each of eight populations, chosen from throughout the range of the species, were selected for their accessibility, density of individuals, and large population size. Two disjunct eastern populations selected for this study have been separated from the continuous western populations for 3600 years by an eight-mile wide, inhospitable lava flow. In an analysis of molecular variance (AMOVA), 88.69 percent of the variation was significantly attributed to variation within populations. Preservation of the numerous, large populations and the high gene flow will help insure that the levels of genetic diversity found in Astragalus oniciformis will not decrease.
- Type
- Academic
- Authors
- Alexander, J
- Date of Issue
- 2001
- Publisher
- Oregon State University
- Units
- CRMO
- Keywords
- astragalus oniciformis, Genetic Diversity, Thesis