HORDEUM MARINUM PDF

Taxonomic Notes: Hordeum marinum Huds. is a tertiary wild relative of Barley, H. vulgare L. (USDA, ARS, National Genetic Resources Program ). Differs from Hordeum leporinum and Hordeum glaucum in that the junction of the with line drawing: Background and Aims Hordeum marinum. is a species complex that includes the diploid subspecies marinum and both diploid and tetraploid.

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The overall resemblance of the two subgenomes present in accession BCC, different from any other Hordeum genomes de Bustos et al. Progress in phylogenetic analysis and a new infrageneric classification of the barley genus Hordeum Poaceae: Moreover, the results of detailed marinkm analyses provide the basis for demonstrating the implication of H. We agree that this taxon should be considered a separate species based on its reproductive isolation after polyploidization, its meiotic behaviour involving the hoedeum exclusive formation of trivalents and the low fertility observed in hybrids with diploid forms Bothmer et al.

For Permissions, please email: Broad Habitats Neutral grassland includes coarse Arrhenatherum grassland.

Factsheet – Hordeum marinum

Although it cannot be ruled out that, for example, translocations or inversions have contributed to the different distributions of repetitive DNA sequences in H. The usefulness of SSR sequences as chromosomal markers revealed by ND-FISH in different species, including several members of the tribe Triticeaehas been reported previously by our group Cuadrado et al.

The relationships within this group of waterlogging-tolerant barleys have remained unclear. January Mean Temperature Celsius: Breaking with what became a long-standing assumption of autopolyploid origin, recent molecular phylogenetic analyses using single nuclear markers seem to indicate that tetraploids originated by hybridization horreum a diploid form of gussoneanum and another diploid progenitor. Relationships in the genus Hordeum: Rapid cytological diploidization in newly formed allopolyploids of the wheat Aegilops – Triticum group.

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Key Results The identification of each chromosome pair in all subspecies and cytotypes is reported for the first time. To understand jarinum genomic constitution of H.

Evolutionary trends of repetitive DNA sequences during H. With the exception of AG 10ACT hhordeum and ATC 5 which were ineffective as chromosome markersthe probes used in the present work provided a saturated physical map of Horxeum. The non-random distribution of long clusters of all possible classes of tri-nucleotide repeats in barley chromosomes. It is susceptible to successional changes, tending to be overpowered by perennial grasses notably Elytrigia athericaand thus it requires the continuous creation of open ground.

The distribution pattern of the set of repetitive DNA sequences, plus chromosome morphology, helped establish putative homologies among chromosomes assigned the same number in the subspecies of H. An autopolyploid origin is supported by a number of cytogenetic studies, including the analysis of C-banded karyotypes and the meiotic behaviour of hybrids Bothmer et al.

These are usually recognized as a single species, H. An effort was made to identify homologous chromosomes for the two diploid taxa.

In karyotype analysis Fig. Hence the two subgenomes present in polyploids are segmental in nature. It could be that independent mechanisms of amplification or reduction of the number of copies of each repeat sequence in different lineages occurred after they split from a common ancestor.

The physical map of AAG 5 produced the clearest distribution pattern of diagnostic signals, allowing the horddeum of the seven chromosome pairs. Specific chromosomal markers characterized and differentiated the genomes of marinum and diploid gussoneanum.

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Hordeum marinum

Evolutionary process of Hordeum brachyantherum 6x and related tetraploid species revealed by nuclear DNA sequences. This is supported by the observation of regular meiotic behaviour in hybrids between marinum and diploid forms of gussoneanum e. Another major disagreement concerns the auto- or allopolyploid origin of the tetraploids.

Seedlings occur in spring and autumn but the latter may not survive the winter. The chromosomes of each taxon, which are not identifiable either marimum their morphology or by their C-banding pattern, were characterized in detail by multiple-target in situ hybridization analysis.

Ecology An annual of barish places by the sea, on the trampled margins of dried-up pools and ditches in grazing marshes, on tracks and sea walls, and in the uppermost parts of saltmarshes; also, very locally, beside salt-treated roads inland.

Although individual chromosome identification was very difficult with this probe, greater similarities were seen in the pattern of distribution of pAs1 among accessions BCC and GRA than between either of these accessions and accession GRA compare Fig.

Plants Profile for Hordeum marinum (seaside barley)

Characteristic associates in these open communities include Puccinellia distans, Spergularia marina and the scarce species Polypogon monspeliensis, Puccinellia fasciculata and P. Slides were examined using a Zeiss Axiophot epifluorescence microscope. Link to interactive map.

The structure, amount and chromosomal localization of defined repeated DNA sequences in species of the genus Secale. This confirms the putative involvement of gussoneanum as a diploid ancestor of H.

Although the results of this work distinguish the chromosomes of H.