such as "Introduction", "Conclusion"..etc
May 11, 2006 -- Plant and animal breeders have long used hybridization to transfer
useful traits between species. But does the same process happen without
human aid? In a new study in the June issue of American Naturalist,
Kenneth D. Whitney (Indiana University and Rice University), Rebecca A.
Randell (Indiana University), and Loren H. Rieseberg (Indiana
University), explore how spontaneous hybridization - known as adaptive
trait introgression - has a vital impact on adaptation and evolutionary
role of hybridization in adaptive evolution is contentious. While many
cases of adaptive trait introgression have been proposed, the relevant
traits have rarely been identified, resulting in a lack of clear
examples of this process," write the authors.
The researchers examined a northern sunflower species that had captured
genes from a southern sunflower species, resulting in a stabilized
hybrid, Helianthus annuus texanus, able to expand southward into
central and southern Texas. They then recreated the original
hybridization event by manually crossing two parent species. Not only
were these hybrids resistant to the insects that attack sunflowers,
they also produced more seeds than the uncrossed plants.
results show for the first time that adaptive trait introgression can
be a potent evolutionary force, broadening our view of the mechanisms
by which populations adapt to their environments," explain the authors.
Source : University of Chicago Press Journals
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