A STUDY OF VARIABILITY IN CRESTED WHEATGRASS

1955 ◽  
Vol 33 (6) ◽  
pp. 534-546 ◽  
Author(s):  
R. P. Knowles
Keyword(s):  
North American ◽  
Agropyron Cristatum ◽  
Tetraploid Species ◽  
Root Tips ◽  
Chromosome Counts ◽  
Crested Wheatgrass ◽  
Fertile Hybrids ◽  
Accessory Chromosomes ◽  
Sterile Hybrids

Thirty-one strains of crested wheatgrass from European and North American sources were assigned to six morphological forms. These forms showed affinities to the species Agropyron cristatum (L.) Gaertn., A. desertorum (Fisch.) Roem. & Schult., A. sibiricum (Willd.) P.B., A. fragils (Roth.) Nevski, A. michnoi Roshev., and A. imbricatum (M.B.) Roem. & Schult. Typical plants, spikes, glumes, and seeds of the six forms were illustrated. Eight strains of A. cristatum were diploid (2n = 14) and two strains were tetraploid (2n = 28). Strains of all other forms were tetraploid. Chromosome counts of root tips indicated no aneuploids in 71 diploid plants and one aneuploid (2n = 29) in 96 tetraploid plants. Meiotic observations, however, indicated accessory chromosomes in 14 of 43 tetraploid plants. Diploid forms of A. cristatum crossed sparingly with tetraploid species to form sterile hybrids. All tetraploid species were interfertile and formed fertile hybrids. Most desirable strains agronomically were of the species A. cristatum, A. desertorum, and A. imbricatum. Most vigorous hybrids were sterile plants from crosses of A. desertorum and A. cristatum.

scholarly journals RNA-Seq Analysis of Plant Maturity in Crested Wheatgrass (Agropyron cristatum L.)

Genes ◽  
2017 ◽  
Vol 8 (11) ◽  
pp. 291 ◽  
Author(s):  
Fangqin Zeng ◽  
Bill Biligetu ◽  
Bruce Coulman ◽  
Michael Schellenberg ◽  
Yong-Bi Fu
Keyword(s):  
Agropyron Cristatum ◽  
Rna Seq ◽  
Crested Wheatgrass ◽  
Plant Maturity

Morphological characteristics of crested wheatgrass populations of diverse origin

2002 ◽  
Vol 82 (4) ◽  
pp. 693-699 ◽  
Author(s):  
A. Mellish ◽  
B. Coulman
Keyword(s):  
Morphological Characteristics ◽  
Agropyron Cristatum ◽  
Crested Wheatgrass ◽  
Crown Diameter ◽  
Crown Width ◽  
Row Width ◽  
Diverse Origin ◽  
One Year ◽  
Tiller Density ◽  
Tiller Angle

In crested wheatgrass, the species Agropyron cristatum includes populations that are diploid and tetraploid, either naturally or artificially induced. The species Agropyron desertorum is tetraploid and there are culitvars that are hybrids between A. cristatum and A. desertorum. The goal of this study was to compare the morphology (height, crown width, tiller density, tiller weight and tiller angle) of populations from the two species and hybrids, including S9240, a recently developed colchicine induced tetraploid A. cristatum. Data were collected in 1999 and 2000 from several different sward-seeded and spaced-planted trials. The four tetraploid crested wheatgrasses (A. cristatum “Kirk” and “S9240”, A. desertorum “Nordan”, and A. desertorum × A. cristatum “CD-II”) were significantly (P < 0.05) taller, narrower in row width, and produced fewer, heavier tillers than the diploid A. cristatum “Parkway”. Among the tetraploid populations, S9240 was significantly (P < 0.05) taller and produced fewer tillers. S9240 also produced significantly (P < 0.05) heavier tillers than CD-II and Nordan, and also than Kirk, one year of two. Row widths were variable among populations, but S9240 generally produced a narrower crown than other populations. Key words: Crested wheatgrass, polyploidy, plant height, crown diameter, tiller characteristics

PRODUCTIVITY AND DURABILITY OF CRESTED WHEATGRASS IN SOUTHEASTERN ALBERTA

1967 ◽  
Vol 47 (5) ◽  
pp. 539-548 ◽  
Author(s):  
S. Smoliak ◽  
A. Johnston ◽  
L. E. Lutwick
Keyword(s):  
Agropyron Cristatum ◽  
Native Range ◽  
Crested Wheatgrass ◽  
Mixed Prairie

Productivity and durability of 29- to 38-year-old stands of crested wheatgrass, Agropyron cristatum Gaertn., were assessed. Crested wheatgrass consistently outyielded the grass and sedge component of Mixed Prairie native range vegetation by a ratio that ranged from 12.42 to 1.08. Analysis of soils showed that exhaustion of N was not a factor in persistence of stands. The data indicated that, in the study area, seeded stands of crested wheatgrass became a permanent part of the vegetation and that yield was dependent mainly on current rainfall.

Chromosome numbers of 15 North American bumble bee species (Hymenoptera, Apidae, Bombini)

1983 ◽  
Vol 25 (1) ◽  
pp. 26-29
Author(s):  
Robin E. Owen
Keyword(s):  
Chromosome Number ◽  
North American ◽  
Chromosome Numbers ◽  
Bumble Bees ◽  
Bumble Bee ◽  
Morphological Divergence ◽  
Chromosome Counts ◽  
Monophyletic Origin ◽  
The Social

Chromosome counts were obtained for 14 Bombus Latr. species (the social bumble bees) belonging to four subgenera and for one Psithyrus Lep. species (the social parasitic bumble bees). In Bombus the haploid numbers were consistent within each subgenus and there was variation between subgenera; the subgenera Bombus s.s. and Pyrobombus have n = 18, while Separatobombus and Cullumanobombus have n = 19. Thus considerable morphological divergence between subgenera is often, but not always, paralleled by divergence in chromosome number. Psithyrus ashtoni has n = 25, higher than all Bombus species yet examined. This provides support for the monophyletic origin of Psithyrus, but the high n is not expected if eusociality selects for increase in chromosome number.

scholarly journals RNA-Seq analysis of gene expression for floral development in crested wheatgrass (Agropyron cristatum L.)

PLoS ONE ◽  
2017 ◽  
Vol 12 (5) ◽  
pp. e0177417 ◽  
Author(s):  
Fangqin Zeng ◽  
Bill Biligetu ◽  
Bruce Coulman ◽  
Michael P. Schellenberg ◽  
Yong-Bi Fu
Keyword(s):  
Gene Expression ◽  
Floral Development ◽  
Agropyron Cristatum ◽  
Rna Seq ◽  
Crested Wheatgrass

Taxonomic studies on the genus Atrichum in North America

1969 ◽  
Vol 47 (3) ◽  
pp. 353-368 ◽  
Author(s):  
Robert R. Ireland
Keyword(s):  
United States ◽  
North America ◽  
North American ◽  
Distinct Species ◽  
The United States ◽  
Morphological Characters ◽  
Taxonomic Study ◽  
Chromosome Counts ◽  
The Status ◽  
Taxonomic Studies

A taxonomic study was made of several North American taxa in the genus Atrichum. The primary emphasis was on the Canadian taxa and a key to the six species (A. altecristatum, A. angustatum, A. crispum, A. oerstedianum, A. selwynii, A. undulatum) and one variety (A. undulatum var. gracilisetum) of the country is presented. Atrichum oerstedianum, which has been confused with A. undulatum, is added to the moss flora of the United States and Canada. The distribution of A. crispum is clarified and a detailed study of the species revealed new morphological characters that are useful to distinguish it. A variety of A. undulatum, the var. altecristatum, is raised to the rank of a species and morphological and distributional data are given to support the status of A. selwynii as a distinct species. The first chromosome counts are reported for A. selwynii (n = 7) and A. altecristatum (n = 14). Detailed descriptions are provided for A. altecristatum, A. crispum, A. oerstedianum, and A. selwynii.

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