Genetics and geography of wild cereal domestication in the near east

Salamini, F.; Özkan, Hakan; Brandolini, Andrea; Schäfer-Pregl, Ralf; Martin, William

doi:10.1038/nrg817

Cited by 627 publications

(491 citation statements)

References 69 publications

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“…1d, both domesticated sets of lines are more related to Karacadag than Kartal populations and thus we return to the belief that while the core area of Lev-Yadun et al (2000) has played a clear role in the domestication of tetraploid wheat, the identification of a more precise location(s) within this area is still difficult. Factors contributing to keep this problem open are discussed in Salamini et al (2002) and Mori et al (2003).…”

Section: Discussionmentioning

confidence: 99%

“…First, the geographical distributions of the wild progenitors of wheat (Triticum boeticum, T. urartu, T. dicoccoides, Aegilops tauschii), wild barley (Hordeum spontaneum) and wild rye (Secale vavilovii) intersect in this region (Nesbitt and Samuel 1996;Zohary and Hopf 2000;Salamini et al 2002). Second, seeds of the wild species have been found in early archaeological sites of the region, followed in stratigraphic succession by the remains of domesticated forms (Moore et al 2000;Gopher et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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A reconsideration of the domestication geography of tetraploid wheats

et al. 2005

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The domestication of tetraploid wheats started from their wild progenitor Triticum dicoccoides. In this paper, the geographical distribution of this progenitor is revised to include more sampling locations. The paper is based on a collection of wild and domesticated lines (226 accessions in total) analyzed by AFLP at 169 polymorphic loci. The collection includes the 69 wild lines considered by Mori et al. (2003) in their study on chloroplast DNA haplotypes of T. dicoccoides. The goal of the experiment was to reconsider which location thought to have generated the domesticated germplasm has the highest chance of being the actual site from which wild progenitors were sampled during domestication. Phylogenetic analysis of the nuclear AFLP databases indicates that two different genetic taxa of T. dicoccoides exist, the western one, colonizing Israel, Syria, Lebanon and Jordan, and the central-eastern one, which has been frequently sampled in Turkey and rarely in Iran and Iraq. It is the central-eastern race that played the role of the progenitor of the domesticated germplasm. This is supported by the cumulative results of the AFLP data from the collections of Ozkan et al. (2002) and of Mori et al. (2003), which indicate that the Turkish Karacadag population, intermixed with some Iraq-Iran lines, has a tree topology consistent with that of the progenitor of domesticated genotypes. The Turkish Kartal population belongs genetically to the central-eastern T. dicoccoides race but at the nuclear DNA level is less related to the domesticated gene pool. A general agreement between published work on tetraploid wheat domestication emerges from these results. A disagreement is nevertheless evident at the local geographical scale; the chloroplast DNA data indicate the Kartal mountains while AFLP fingerprinting points to the Karacadag Range as the putative site of tetraploid wheat domestication.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A reconsideration of the domestication geography of tetraploid wheats

et al. 2005

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“…The genomes of B. graminis f.sp. tritici isolates are composed of haplogroup segments that predate the formation of their hexaploid bread wheat host 10,000 years ago 30 . Thus, the shift from wild tetraploid to domesticated hexaploid wheat seemingly has not reduced genetic diversity in B. graminis f.sp.…”

Section: E T T E R Smentioning

confidence: 99%

The wheat powdery mildew genome shows the unique evolution of an obligate biotroph

et al. 2013

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“…tauschii accessions indicates that this particular allele originated after the hybridization of tetraploid wheat with Ae. tauschii, the event that gave rise to modern hexaploid bread wheat about 8,000 years ago (Feldman 2001;Salamini et al 2002). Most likely, two gain-offunction mutations in Lr34sus-D in an ancestral wheat landrace resulted in the novel Lr34res-D allele that conferred enhanced tolerance against fungal diseases.…”

Section: Lr34 Haplotypes In Wheat Rice and Sorghummentioning

confidence: 99%

Recent emergence of the wheat Lr34 multi-pathogen resistance: insights from haplotype analysis in wheat, rice, sorghum and Aegilops tauschii

Krattinger

Jordan

Mace³

et al. 2012

Theor Appl Genet

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Spontaneous sequence changes and the selection of beneficial mutations are driving forces of gene diversification and key factors of evolution. In highly dynamic co-evolutionary processes such as plant-pathogen interactions, the plant's ability to rapidly adapt to newly emerging pathogens is paramount. The hexaploid wheat gene Lr34, which encodes an ATP-binding cassette (ABC) transporter, confers durable field resistance against four fungal diseases. Despite its extensive use in breeding and agriculture, no increase in virulence towards Lr34 has been described over the last century. The wheat genepool contains two predominant Lr34 alleles of which only one confers disease resistance. The two alleles, located on chromosome 7DS, differ by only two exon-polymorphisms. Putatively functional homoeologs and orthologs of Lr34 are found on the B-genome of wheat and in rice and sorghum, but not in maize, barley and Brachypodium. In this study we present a detailed haplotype analysis of homoeologous and orthologous Lr34 genes in genetically and geographically diverse selections of wheat, rice and sorghum accessions. We found that the resistant Lr34 haplotype is unique to the wheat D-genome and is not found in the B-genome of wheat or in rice and sorghum. Furthermore, we only found the susceptible Lr34 allele in a set of 252 Ae. tauschii genotypes, the progenitor of the wheat D-genome. These data provide compelling evidence that the Lr34 multi-pathogen resistance is the result of recent gene diversification occurring after the formation of hexaploid wheat about 8,000 years ago. AbstractSpontaneous sequence changes and the selection of beneficial mutations are driving forces of gene diversification and key factors of evolution. In highly dynamic coevolutionary processes such as plant-pathogen interactions, the plant's ability to rapidly adapt to newly emerging pathogens is paramount. The hexaploid wheat gene Lr34, which encodes an ATP-binding cassette (ABC) transporter, confers durable field resistance against four fungal diseases. Despite its extensive use in breeding and agriculture, no increase in virulence towards Lr34 has been described over the last century. The wheat genepool contains two predominant Lr34 alleles of which only one confers disease resistance. The two alleles, located on chromosome 7DS, differ by only two exon polymorphisms. Putatively functional homoeologs and orthologs of Lr34 are found on the B-genome of wheat and in rice and sorghum, but not in maize, barley and Brachypodium. In this study we present a detailed haplotype analysis of homoeologous and orthologous Lr34 genes in genetically and geographically diverse selections of wheat, rice and sorghum accessions. We found that the resistant Lr34 haplotype is unique to the wheat D-genome and is not found in the B-genome of wheat or in rice and sorghum. Furthermore, we only found the susceptible Lr34 allele in a set of 252 Ae. tauschii genotypes, the progenitor of the wheat D-genome. These data provide compelling evidence that the Lr34 mult...

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Genetics and geography of wild cereal domestication in the near east

Cited by 627 publications

References 69 publications

A reconsideration of the domestication geography of tetraploid wheats

A reconsideration of the domestication geography of tetraploid wheats

The wheat powdery mildew genome shows the unique evolution of an obligate biotroph

Recent emergence of the wheat Lr34 multi-pathogen resistance: insights from haplotype analysis in wheat, rice, sorghum and Aegilops tauschii

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