Plant reproductive strategies under environmental stress
Molano-Flores, Brenda .
Abiotic factors contributing to the breakdown of self-incompatibility.
Self-incompatibility encourages outcrossing by preventing self-fertilization. In a self-incompatible plant, if pollen from the same plant or a similar genotype reaches the stigma, pollen tube germination (sporophytic) or growth (gametophytic) will be stopped along the pistil and fertilization of the ovule will not occur. Nearly half of all flowering plants utilize self-incompatibility as a strategy to force outcrossing. However, many natural populations show variation in the strength of the expression of self-incompatibility as the result of environmental conditions or physiological changes. In addition, self-incompatibility can be overcome by abiotic factors. The main goal of this presentation is to provide a review of the abiotic factors that can breakdown self-incompatibility and the techniques that can be employed to artificially induce self-compatibility. Particular emphasis will be placed on the use of carbon dioxide and temperature. Several case studies will be presented from agricultural and native systems to demonstrate the physical location, chemical reactions and genetic variation associated with the breakdown of self-incompatibility. In addition, a case will be made for why some of these abiotic factors (temperature and carbon dioxide) can no longer be ignored in natural populations of species with self-incompatibility. As carbon dioxide levels and temperatures increase due to global warming, could we see an increase in the switch from self-incompatibility to self-compatibility among natural populations? How will this change affect outcrossing rate, inbreeding depression and reproductive assurance? Could this lead to changes in plant species composition of communities? Although in the laboratory an abiotic factor can be used to breakdown self-incompatibility, in their natural habitat plants are exposed simultaneously to multiple abiotic factors making the interactive effect of these factors even more complex.
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1 - University of Illinois, Illinois Natural History Survey, 1816 S. Oak St., Champaign, IL, 61820, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Westminster Room/Chase Park Plaza
Date: Wednesday, July 13th, 2011
Time: 12:05 PM