Davidson, Jacob B. , Wolf, Paul G. .
Breeding System Characterization of Primula maguirei: a Threatened, Cliff Dwelling, Narrow Endemic Plant.
The maguire primrose (Primula cusickiana var. maguirei or Primula maguirei) is a threatened cliff dwelling endemic plant found only in northern Utahs Logan Canyon. Maguire primrose, like most species in the genus Primula, exhibits reciprocal herkogamy in its morphology. Pin morphs have stigmas that extend to the opening of the corolla tube and anthers found near the bottom of the tube. Thrum morphs have stigmas found near the bottom of the corolla tube and anthers that are near the mouth of the corolla tube. Despite the spatial separation of anthers and stigmas, self fertilization has been observed for a number of Primula species. In the spring of 2008, we made hand pollinations using intramorph illegitimate outcrossings, legitimate intermorph outcrossings, and various autogamy and geitonogamy tests, while excluding pollinators. Resulting seed set was examined from each treatment. The largest number of seeds was observed for open pollinated plants, followed plants receiving legitimate outcrossings. Less seed set was observed for illegitimate outcrossing and selfing treatments. Within treatments, pin and thrum morphs had unequal number of seeds set. Temperature and relative humidity monitors were placed near the plants, to see if environmental conditions affected hand pollination success. Temperature fluctuations at each study site ranged widely between freezing temperatures and 20ÂșC. We share our preliminary results from this initial field season here.
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1 - Utah State University, Department of Biology, Logan, Utah
2 - Utah State University, Department of Biology, 5305 Old Main Hill, Logan, UT, 84322-5305, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Wasatch A/Cliff Lodge - Level C
Date: Monday, July 27th, 2009
Time: 2:45 PM