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Abstract Detail


Molecular Ecology and Evolution

Scott, Alison Dawn [1], Baum, David [1].

Evolutionary history and origin of polyploidy in Sequoia sempervirens.

The majestic coast redwood (Sequoia sempervirens; Cupressaceae) is one of the few polyploid conifers, and the only hexaploid (2n=6x=66). Coast redwoods are long-lived trees (some over 2,000 years) and are among the very tallest tree species in the world (up to 115 meters). Their geographical range is limited to the coast of central and northern California, but the fossil record suggests a broader historical distribution.
The origin of hexaploidy in S. sempervirens has been a source of speculation; various mechanisms of polyploidization and putative ancestral genome donors have been suggested. The closest living relatives of S. sempervirens are the dawn redwood, Metasequoia glyptostroboides, native to China, and the giant redwood, Sequoiadendron giganteum, endemic to interior central California. South American alerce, Fitzroya cupressoides, is another Cupressaceous tetraploid(2n=4x=44) and is morphologically similar to the redwoods. Several low-copy nuclear genes have been amplified in S.sempervirens and its close relatives and molecular sequence analysis is being used to unravel the ancient polyploid origin of coast redwood.

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1 - University Of Wisconsin, Department Of Botany, Birge Hall, 430 Lincoln Drive, Madison, WI, 53706, USA

Keywords:
Polyploidy
genome duplication
redwood
Cupressaceae.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM
Number: PME007
Abstract ID:725


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