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Meadow Barley

Hordeum brachyantherum Nevski

Brief Summary

provided by EOL authors
Hordeum brachyantherum occurs broadly in North America and in western Russia on the Kamchatka Peninsula. Chief habitats include wet meadows, riparian zones, forest clearings grasslands or roadsides.

With a common name of Meadow barley, this perennial tufted grass achieves a height of up to one meter. The species occcurs in diploid and tetrapoid forms.

Meadow barley has shown utility in vegetative restoration for denuded areas, since it grows rapidly and tolerates marginal soils such as those high in salinity. It is also valuable in providing cover for small wildlife species. In the early growth phase it is a moderately good food source for ungulates, but in the later season that value subsides.
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Physical Description

provided by USDA PLANTS text
Perennials, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath and blad e differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, Leaf blades more or less hairy, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence single raceme, fascicle or spike, Inflorescence spikelets arranged in a terminal bilateral spike, Flowers bisexual, Spikelets sessile or subsessile, Spikelets dorsally compressed or terete, Spikelet less than 3 mm wide, Spikelets with 1 fertile floret, Spikelets 3 per node, Spikelets distichously arranged, Spikelets bisexual, Inflorescence disarticulating between nodes or joints of rachis, rachis fragmenting, Spikelets disarticulating below the glumes, Spikelets falling with parts of disarticulating rachis or pedicel, Spikelets closely appressed or embedded in concave portions of axis, Rachilla or pedicel glabrous, Glumes present, empty bracts , Glumes 2 clearly present, Glumes equal or subequal, Glumes equal to or longer than adjacent lemma, Glumes awn-like, elongated or subulate, Glumes awned, awn 1-5 mm or longer, Glumes 1 nerved, Glumes 3 nerved, Lemma coriaceous, firmer or thicker in texture than the glumes, Lemma 5-7 nerved, Lemma glabrous, Lemma apex acute or acuminate, Lemma mucronate, very shortly beaked or awned, less than 1-2 mm, Lemma distinctly awned, more than 2-3 mm, Lemma with 1 awn, Lemma awn less than 1 cm long, Lemma awned from tip, Lemma awn from sinus of bifid apex, Lemma awns straight or curved to base, Lemma margins thin, lying flat, Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea about equal to lemma, Palea 2 nerved or 2 keeled, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear, Caryopsis hairy at apex.
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Hordeum brachyantherum

provided by wikipedia EN

Hordeum brachyantherum, known by the common name meadow barley, is a species of barley. It is native to western North America from Alaska to northern Mexico, coastal areas of easternmost Russia (Kamchatka), and a small area of coastal Newfoundland.

The diploid cytotype occurs only in California, throughout the state, while everywhere else plants are tetraploid.

This is a tufting perennial bunchgrass approaching a meter in maximum height. It produces compact, narrow inflorescences 8 to 10 centimeters long and purplish in color. Like other barleys the spikelets come in triplets. It has two small, often sterile lateral spikelets on pedicels and a larger, fertile central spikelet lacking a pedicel.

General information

Hordeum brachyantherum belongs to grass family, Poaceae, genus Hordeum. There are two common cytotypes of Hordeum brachyantherum. The diploid mainly grow in California, the tetraploid grow widely over the world. Polyploidy is very common in plants. Polyploidization plays an important role in plant evolution, it is commonly used in agriculture to develop novel phenotypes.[1] Polyploidization also occurs naturally in plant populations. In 1980, a rare hexaploid form of Hordeum brachyantherum was discovered in California within the populations of diploid and tetraploid Hordeum brachyantherum. It was hypothesized that this hexaploid form was evolved by outcrossing between diploid Hordeum marine and tetraploid Hordeum brachyantherum ssp. brachyantherum and followed by duplication of chromosome.[2] Polyploidization may lead to speciation because the reproductive isolation may develop between hexaploid and either tetraploid or diploid due to the mistake of alignment during meiosis.

Homology

Hordeum contains a gene called hordoindoline that involves grain hardness and antimicrobial activity. Since wheat contains a homologous gene named puroindoline, it was concluded that Hordeum and wheat shared a common ancestor during the evolutionary process. The novel variants of hordoindoline genes were found in Hordeum brachyantherum. It was hypothesized that the novel genes arose due to the gene duplication during the early stage of the divergence of the genus Hordeum. Some of the non-synonymous mutations are beneficial and show an overall improved antifungal activity.[3] These non-synonymous mutations provide the material for evolution because natural selection can select for organisms who possess these mutations and alter the allele frequency over time.

Salinity

Natural selection can also act on salinity tolerance for many plants. High salinity may negatively impact germination success, plant growth, and survival. Thus, under evolutionary process including natural selection, some plants developed morphological and physiological adaptations to live in high salinity conditions. The effect of salinity on germination rate shows both inter-specific and intra-specific variation. Compared to other perennial plants such as Agrostis stolonifera, Hordeum brachyantherum is more tolerated under high salinity. The seedling lengths and root or shoot lengths show different responses to high salinity. The seedling lengths of Hordeum brachyantherum are more negatively affected by high salinity.[4] The intra-specific variation in the ability to tolerate elevated salinity among populations of Hordeum brachyantherum may result from the genetic variation which underlines the basis of evolution of Hordeum brachyantherum.

Ecology

One major function of perennial plants is to restore the land and ecosystem. Hordeum brachyantherum is used to restore the native perennial grasslands in California and to reduce the density of non-native annual plants. The perennial plants can rapidly recover the soil microbial biomass in the grasslands due to the carbon supply maintained by the perennial plants. The species diversity and composition is not affected by the restoration, however, the relative proportion of the native plant biomass increased in the restored perennial grassland.[5]

References

  1. ^ Mason AS, and Batley J (2015) Creating new interspecific hybrid and polyploid crops. Trends In Biotechnology 33(8): 436-441
  2. ^ Komatsuda T, Salomon B, Bothmer RV. (2009) Evolutionary process of Hordeum brachyantherum 6x and related tetraploid species revealed by nuclear DNA sequences. Breeding Science 59(5):611-616.
  3. ^ Terasawa Y, Takata K, Anai T, Ikeda TM. (2013) Identification and distribution of Puroindoline b-2 variant gene homologs in Hordeum. Genetica 141(7-9): 359-368.
  4. ^ Janousek CH, Folger CL. (2013) Inter-specific variation in salinity effects on germination in Pacific Northwest tidal wetland plants. Aquatic Botany 111: 104-111.
  5. ^ Potthoff M, Jackson LE, Steenwerth KL, Ramirez I, Stromberg MR, Rolston DE. (2005) Soil Biological and chemical properties in restored perennial grassland in California. Restoration Ecology 13(1):61-73.

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wikipedia EN

Hordeum brachyantherum: Brief Summary

provided by wikipedia EN

Hordeum brachyantherum, known by the common name meadow barley, is a species of barley. It is native to western North America from Alaska to northern Mexico, coastal areas of easternmost Russia (Kamchatka), and a small area of coastal Newfoundland.

The diploid cytotype occurs only in California, throughout the state, while everywhere else plants are tetraploid.

This is a tufting perennial bunchgrass approaching a meter in maximum height. It produces compact, narrow inflorescences 8 to 10 centimeters long and purplish in color. Like other barleys the spikelets come in triplets. It has two small, often sterile lateral spikelets on pedicels and a larger, fertile central spikelet lacking a pedicel.

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Wikipedia authors and editors
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wikipedia EN