Douglas R. Dewey's research while affiliated with Utah State University and other places
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Publications (12)
Dewey and Löve have suggested that generic limits in the Triticeae should be determined by the genomic data, taxa with different genomic constitutions being placed in different genera. According to this interpretation, nine genera of perennial Triticeae occur in North America. Five of these ( Critesion, Elymus, Leymus, Pascopyrum , and Pseudoroegne...
Morphological studies of populations belonging to three taxa of Leymus revealed that L. salinus comprises L. salinus subsp. salinus and L. salinus subsp. salmonis. These subspecies are geographically separated: subsp. salinus occurs in eastern Utah, northern Arizona, southwestern Wyoming, and western Colorado whereas subsp. salmonis occurs in Idaho...
Of the approximately 325 species in the tribe Triticeae (= Hordeeae), about 250 are perennials that include many of the world’s important forage grasses. Although more than 75% of the species in the Triticeae are perennials, they have received far less attention from cytogeneticists and plant breeders than have the annuals, which include three majo...
Recent generic realignments of the perennial grasses of the tribe Triticeae necessitate some new name combinations for North
American species. Three new species combinations and three new subspecies combinations are made to accommodate six long-anthered
and usually cross-pollinating species ofAgropyron sensu A. S. Hitchcock in the genusElytrigia se...
Meiosis and mode of reproduction are described in Agropyron ferganense Drob., a perennial forage grass from Central Asia. This species is diploid (2n = 14); it exhibits normal meiosis and reproduces by cross-pollination. Hybrids were produced between A. ferganense and six species with known genome formulas: 1) North American A. spicatum (Pursh) Scr...
Seven collections of Agropyron ugamicum Drob., introduced into the United States from Central Asia in 1965, proved to be tetraploid, 2n = 28, and self-fertilizing. Hybrids were obtained between A ugamicum and six other Agropyron species with known genome constitutions: North American A. spicatum (Pursh) Scribn. & Smith, 2n = 14, SS; Middle Eastern...
Plant breeders are eternal optimists, always searching for and expecting significant breakthroughs in plateaus of yield, quality, or adaptation. These breakthroughs have been achieved in some crops, notably maize (Zea mays) and grain sorghum (Sorghum bicolor) (1); but they have been elusive in others, particularly forage crops, in which conventiona...
Fifty-seven Iranian collections of Hordeum violaceum Boiss. & Huet, a perennial forage grass, contained diploid (2n = 14), tetraploid (2n = 28), and hexaploid (2n = 42) chromosome races. All collections came from moderate to high elevations in the Alborz and Zagros mountains and adjacent plateau areas of Iran. Each chromosome race had a discrete di...
Citations
... 28 Chen et al. (1990); Limin and Fowler (1990) Agropyron distichum 28 Pienaar (1981) Agropyron elongatum 14 Franke et al. (1992) Agropyron intermedium 42 Sharma and Gill (1983) Agropyron michnoi Roshev. 28 Chen et al. (1990); Li and Dong (1991) Agropyron podperae - Dewey (1981) Agropyron scirpeum - Sharma and Gill (1981b) Agropyron trachycaulum 28 Sharma and Gill (1981b) Elymus altissimus 28 Lu and von Bothmer (1991) Elymus anthosachnoides 28 Lu and von Bothmer (1991) Elymus canadensis 28 Mujeeb- Bernard (1982, 1985); Yen and Liu (1987) (1984,1989) Elytrigia repens 42 Comeau et al. (1985); Mujeeb-Kazi et al. (1984 Elytrigia varnese 42 Mujeeb-Kazi et al. (1984, 1987 Haynaldia villosa 14 Knobloch (1968) Hordeum bulbosum 28 Falk and Kasha (1981) Hordeum bulbosum 14 Falk and Kasha (1981) Hordeum californicum 14 Gupta and Fedak (1985) Hordeum chilense 14 Martin and Chapman (1977) Hordeum claifornicum 14 Gupta and Fedak (1985) Hordeum depressum 28 Jiang and Liu (1987) Hordeum geniculatum 28 Pershina et al. (1988) Hordeum jubatum 28 Comeau et al. (1988) Hordeum marinum 14 Jiang and Liu (1987) Hordeum pusillum 14 Finch and Bennett (1980) (1984,1987) Thinopyron gentryi 42 Mujeeb-Kazi et al. (1984, 1987 Thinopyron junceiforme 28 Mujeeb-Kazi et al. (1984 Thinopyron junceum 42 Charpentier et al. (1986); Mujeeb-Kazi et al. (1984 Thinopyron sartorii 28 Mujeeb-Kazi et al. (1984, 1987 Thinopyrum bessarabicum 14 Sharma and Gill (1983) Thinopyrum ponticum 70 Smith (1942) Barriers that limit exploitation of wild species in wheat breeding Exploitation of these three groups relies on three main features: the ability to make the cross between the related species and wheat, the germination capacity and fertility of hybrids and the capability of the homologous/homoeologous chromosomes to recombine properly with those of wheat. Usually, hybrids derived from crosses between species with different ploidy levels are poorly fertile because of imbalanced chromosome number in the F 1 individuals, which affects pollen development and subsequent fertilisation (Kihara, 2013). ...
... The hexaploid cytotype of H. brevisubulatum behaves cytologically as an autoploid (DEWEY 1979; Dedicated to Professor Akr Gustdfsson on the occasion of his 80th birthday LANDsTROMet al. 1984), whereas the other hexaploid species in earlier studies have been reported to be alloploid or segmental alloploid types (cf. RAJHATHY and MORRISON 1961;SUBRAHMANYAM 1978;FEDAK 1983;REDDY and SUBRAHMANYAM 1985;BOTHMER et al. 1986b). ...
... Although taxonomic treatments of the Triticeae vary (Dewey 1984;Löve 1984; Barkworth and Dewey 1985;Kellogg 1989), these species have been organized into approximately 20-30 diploid or autopolyploid genera and several exclusively allopolyploid genera, including Elymus, Leymus, and Pascopyrum (Kellogg et al. 1996;Bernhardt 2015). The genus Thinopyrum, which contains approximately 10 species (Barkworth 2007), is an exception in that it contains diploid, autopolyploid, and allopolyploid taxa (Kellogg et al. 1996;Ceoloni et al. 2014). ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272306131959831-1441934249710_Q64/Mary-Barkworth.jpg)
... Agropyron Gaertn., a perennial genus of the tribe Triticeae, contains one basic P genome in three ploidy levels: diploid, tetraploid, and hexaploid (Dewey 1984). It possesses many useful traits, including resistance to many wheat diseases, such as rusts and powdery mildew; tolerance to drought, cold, and salt; and characteristics associated with high yields, such as the production of multiple spikelets, florets, and fertile tillers. ...
... The Elymus genus (Triticeae, Gramineae), belonging to the Triticeae tribe in the Gramineae family, holds the distinction of being the largest genus in the world. It comprises approximately 150 species that are widely distributed across temperate regions globally (Atkins et al., 1984). Elymus species have posed a long-standing puzzle for researchers due to their allotetraploid or allohexaploid nature, with genome compositions of St, H, and Y. ...
... It is an important genetic resource of wheat (Ochoa et al. 2015;Sun et al. 2021). This species encompasses varieties of diploid (PP, 2n = 2x = 14), tetraploid (PPPP, 2n = 4x = 28), and hexaploid (PPPPPP, 2n = 6x = 42) nature (Dewey 1984;Ford-Lloyd et al. 2011). Among these, the diploid variety exhibits a relatively scattered pattern of distribution, while the tetraploid distribution is the most prevalent. ...
... Conversely, the H. brevisubulatum complex is distributed from Western Turkey to eastern China and consists of diploids, tetraploids, and hexaploids (Bothmer 1979, Linde-Laursen et al. 1980. Polyploids of H. brevisubulatum are thought to be autoploid based on morphological (Bothmer 1979, Dewey 1979 and hybrid meiotic analysis (Landström et al. 1984). ...
... Variability of some morphological characters of E. repens and E. intermedia overlaps. However, recent taxonomical studies have presented two morphological characters as reliable for distinguishing between the species: (1) leaf sheath margins-glabrous in E. repens, with macrohairs in E. intermedia ( Kubát & al. 2002); and (2) glume shape-awn-tipped or gradually thinning out in E. repens and truncate or very shortly mucronate in E. intermedia ( Barkworth & Dewey 1985). Morphological differentiation among the parental species and E. ×mucronata is poor, and hybrids and parents often exhibit shared characters. ...
... For the relationship between St and Y genomes, there are 2 controversial opinions. Bivalent chromosome pairing, molecular markers, and gene sequences supported that the 2 distinct St and Y genomes originated independently from different donors [Dewey, 1980;Jensen, 1990;Torabinejad and Mueller, 1993;Gao et al., 2014;Hu et al., 2015]. Conversely, data of nuclear ribosomal internal transcribed spacer (nrITS) sequences, STS markers, and high-molecular-weight glutenin subunit (HMW-GS) gene data suggested that the Y genome shares a progenitor genome (designated St Y ) with the St genome of Pseudoroegneria with gradual differentiation [Liu et al., 2006;Okito et al., 2009;Zhang et al., 2016]. ...
... 28 Chen et al. (1990); Limin and Fowler (1990) Agropyron distichum 28 Pienaar (1981) Agropyron elongatum 14 Franke et al. (1992) Agropyron intermedium 42 Sharma and Gill (1983) Agropyron michnoi Roshev. 28 Chen et al. (1990); Li and Dong (1991) Agropyron podperae - Dewey (1981) Agropyron scirpeum - Sharma and Gill (1981b) Agropyron trachycaulum 28 Sharma and Gill (1981b) Elymus altissimus 28 Lu and von Bothmer (1991) Elymus anthosachnoides 28 Lu and von Bothmer (1991) Elymus canadensis 28 Mujeeb- Bernard (1982, 1985); Yen and Liu (1987) (1984,1989) Elytrigia repens 42 Comeau et al. (1985); Mujeeb-Kazi et al. (1984 Elytrigia varnese 42 Mujeeb-Kazi et al. (1984, 1987 Haynaldia villosa 14 Knobloch (1968) Hordeum bulbosum 28 Falk and Kasha (1981) Hordeum bulbosum 14 Falk and Kasha (1981) Hordeum californicum 14 Gupta and Fedak (1985) Hordeum chilense 14 Martin and Chapman (1977) Hordeum claifornicum 14 Gupta and Fedak (1985) Hordeum depressum 28 Jiang and Liu (1987) Hordeum geniculatum 28 Pershina et al. (1988) Hordeum jubatum 28 Comeau et al. (1988) Hordeum marinum 14 Jiang and Liu (1987) Hordeum pusillum 14 Finch and Bennett (1980) (1984,1987) Thinopyron gentryi 42 Mujeeb-Kazi et al. (1984, 1987 Thinopyron junceiforme 28 Mujeeb-Kazi et al. (1984 Thinopyron junceum 42 Charpentier et al. (1986); Mujeeb-Kazi et al. (1984 Thinopyron sartorii 28 Mujeeb-Kazi et al. (1984, 1987 Thinopyrum bessarabicum 14 Sharma and Gill (1983) Thinopyrum ponticum 70 Smith (1942) Barriers that limit exploitation of wild species in wheat breeding Exploitation of these three groups relies on three main features: the ability to make the cross between the related species and wheat, the germination capacity and fertility of hybrids and the capability of the homologous/homoeologous chromosomes to recombine properly with those of wheat. Usually, hybrids derived from crosses between species with different ploidy levels are poorly fertile because of imbalanced chromosome number in the F 1 individuals, which affects pollen development and subsequent fertilisation (Kihara, 2013). ...
