Systematics Section / ASPT
Sang, Tao .
Genetic, ecological, and systematic views of species divergence in Oryza (Poaceae).
ORYZA nivara and Oryza rufipogon are the wild progenitors of cultivated rice. They are sister species occurring in distinct habitats from southeastern Asia to India. Oryza nivara is annual, self-fertilized, and adapted to seasonally dry habitats, whereas Oryza rufipogon is perennial, cross-fertilized, and adapted to deep-water swamps. The two species have developed prezygotic isolation in nature, but can be crossed experimentally. The argument that they should be treated as ecotypes of the same species has remained for decades. Quantitative trait locus (QTL) analysis of an F2 population derived between the two species revealed the genetic architecture of phenotypic divergence. The genetic complexity of taxonomical and ecological traits was evaluated. The analyses raised the following questions: What is the genetic basis of a taxonomical character? Are taxonomical characters adaptively important? What was the impact of the different species delineations? How can genetic, ecological, and systematic data be reconciled to benefit both basic and applied research?
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1 - Michigan State University, Department of Plant Biology, East Lansing, Michigan, 48824, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, August 2nd, 2006
Time: 4:15 PM