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  Speciation and species separation in Hordeum L. (Poaceae) resolved by discontinuous molecular markers

El-Rabey, H. A., Badr, A., Schafer-Pregl, R., Martin, W., & Salamini, F. (2002). Speciation and species separation in Hordeum L. (Poaceae) resolved by discontinuous molecular markers. Plant Biology, 4(5), 567-575.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-3D81-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-3D83-F
Genre: Journal Article

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El-Rabey, H. A., Author
Badr, A., Author
Schafer-Pregl, R.1, Author              
Martin, W., Author
Salamini, F.1, Author              
Affiliations:
1Dept. of Plant Breeding and Yield Physiology (Francesco Salamini), MPI for Plant Breeding Research, Max Planck Society, ou_1113570              

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Free keywords: AFLPs; phylogeny; speciation; hybridization
 Abstract: Amplified fragment length polymorphisms (AFLPs) were used to evaluate the capacity of discontinuous markers to reveal genetic structure within Hordeum, a challenging higher plant genus from the standpoint of natural systematics. Phylogenies of 63 accessions encompassing nine species from four Hordeum sections were inferred from polymorphisms scored at 600 loci. Phylogenies based on sequences from the nuclear internal transcribed spacer (ITS) region were constructed for comparison, but revealed severe sampling errors inherent to single genes. Although superior by virtue of providing genome- wide estimates of genetic similarity, the adoption of AFLPs in infrageneric studies requires caution. Comigrating AFLP bands Studied here could be divided on the basis of band intensity variation into two types that are similar to100% identical and <40% identical in DNA sequence, respectively, in infrageneric comparisons. Thus, the careful selection of AFLP bands to be analyzed bears heavily upon their phylogenetic utility. Within the H. murinum complex, which encompasses three morphologically distinct subspecies, AFLP data from 37 accessions reveal unexpected genetic differentiation between H. murinum, glaucum populations to the east and west of Alexandria (Egypt), suggesting the presence of allopatric speciation in the wake of human settlement.

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Language(s): eng - English
 Dates: 2002-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 28768
ISI: 000179531600004
 Degree: -

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Title: Plant Biology
  Alternative Title : Plant Biol.
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 4 (5) Sequence Number: - Start / End Page: 567 - 575 Identifier: ISSN: 1435-8603