Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support

Reproductive Biology of Agalinis skinneriana (Scrophulariaceae), a Threatened Species

Gregg Dieringer
The Journal of the Torrey Botanical Society
Vol. 126, No. 4 (Oct. - Dec., 1999), pp. 289-295
Published by: Torrey Botanical Society
DOI: 10.2307/2997312
Stable URL: http://www.jstor.org/stable/2997312
Page Count: 7
  • Read Online (Free)
  • Download ($10.00)
  • Subscribe ($19.50)
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
Reproductive Biology of Agalinis skinneriana (Scrophulariaceae), a Threatened Species
Preview not available

Abstract

Agalinis skinneriana is a rare, autogamous, bee-visited, annual plant native to the Illinois prairie. Two populations differing in size were chosen for study: the Site M population with thousands of individuals and Revis Hill Prairie population with only hundreds of individuals. These populations were found to differ significantly in their potential for autogamous selfing. In bagging experiments, the Revis population had a potential selfing rate of 99% compared to 85% at Site M. The higher potential for autogamous selfing in plants at the Revis population was associated with a small population size, no observed bee visitors, a larger ovary, increased proportional biomass to the gynoecium, lower pollen viability, reduced pollen production/flower, and a lower P/O ratio compared with plants at the Site M population. The data suggest that autogamous pollination in A. skinneriana has evolved as a mechanism to assure reproduction as a result of habitat destruction and fragmentation and subsequent small population size.

Page Thumbnails

  • Thumbnail: Page 
289
    289
  • Thumbnail: Page 
290
    290
  • Thumbnail: Page 
291
    291
  • Thumbnail: Page 
292
    292
  • Thumbnail: Page 
293
    293
  • Thumbnail: Page 
294
    294
  • Thumbnail: Page 
295
    295