Improvement of seedling vigor of smooth bromegrass (Bromus inermis Leyss) by recurrent selection for increased seed weight

1969 ◽  
Author(s):  
Clyde Rulon Trupp
Keyword(s):  
Seed Weight ◽  
Recurrent Selection ◽  
Bromus Inermis ◽  
Seedling Vigor ◽  
Smooth Bromegrass ◽  
Selection For

EARLY SEEDLING VIGOUR AND SEED WEIGHT IN RELATION TO BREEDING IN SMOOTH BROMEGRASS, BROMUS INERMIS LEYSS.

1960 ◽  
Vol 40 (2) ◽  
pp. 268-280 ◽  
Author(s):  
W. E. Tossell
Keyword(s):  
Seed Weight ◽  
Field Trials ◽  
Bromus Inermis ◽  
Rapid Progress ◽  
Initial Screening ◽  
Agronomic Characters ◽  
Smooth Bromegrass ◽  
Seedling Vigour ◽  
Close Relationship ◽  
Early Seedling

Variability in early seedling vigour was studied in polycross progenies from highly selected plants rated as good in other agronomic characters and in open-pollinated progenies from previously unselected So plants. Differences were found in both groups in rate and per cent emergence, and in height and vigour at 28 days. Considering the variability observed in these characters and the favourable associations found, it appears that early seedling vigour in bromegrass can be improved by selection within the species.Seed weight was closely associated with early seedling vigour. Plants differed widely in seed weight, and in breeding for early seedling vigour it appears that most rapid progress can be made by screening breeding material for seed weight. Because seed weight did not account for all of the differences among progenies in seedling vigour, progenies from high seed weight plants or families should be subjected to a seedling vigour test to further select for this character. The close relationship found between greenhouse and field trials indicates that at least the initial screening can be done in the greenhouse.

MASS SELECTION FOR RESISTANCE TO SELENOPHOMA BROMIGENA IN NORTHERN AND SOUTHERN TYPES OF BROMUS INERMIS

1967 ◽  
Vol 47 (6) ◽  
pp. 679-681 ◽  
Author(s):  
J. Drew Smith ◽  
R. P. Knowles
Keyword(s):  
Disease Resistance ◽  
Leaf Spot ◽  
Bromus Inermis ◽  
Mass Selection ◽  
Progeny Testing ◽  
Smooth Bromegrass ◽  
Selection For ◽  
Better Than

In the epidemic years 1965 and 1966, field ratings confirmed that southern strains of smooth bromegrass, Bromus inermis Leyss, were generally less susceptible to leaf spot caused by Selenophoma bromigena (Sacc.) Sprague & A. G. Johnson than northern strains. The northern/southern hybrid S-6733, developed by mass selection and progeny testing, was found to resist S. bromigena at least as well as the southern strains Lincoln and Redpatch, and better than the southern Saratoga. It was found possible to improve resistance of the susceptible northern strain Carlton by mass selection. Northern strains probably do not have as great a potential for improvement in disease resistance as southern strains or hybrids.

SELECTION FOR IMPROVED SEEDLING VIGOR IN RUSSIAN WILD RYEGRASS

1984 ◽  
Vol 64 (1) ◽  
pp. 131-138 ◽  
Author(s):  
J. D. BERDAHL ◽  
R. E. BARKER
Keyword(s):  
Seed Weight ◽  
Seedling Emergence ◽  
Field Tests ◽  
Visual Assessment ◽  
Seedling Vigor ◽  
Coleoptile Length ◽  
Stand Establishment ◽  
Psathyrostachys Juncea ◽  
Emergence Percentage ◽  
Selection For

Seedling emergence of 30 open-pollinated progeny lines of Russian wild ryegrass (Psathyrostachys juncea (Fisch.) Nevski. Syn: Elymus junceus Fisch.) ranging in seed weight from 2.1 to 4.5 mg/seed was evaluated in laboratory and greenhouse tests and compared to stand establishment capability in the field. Increases in emergence percentage and coleoptile length associated with increased seed weight diminished when seed weights of parents increased beyond 3.0 mg/seed. Emergence in two field environments was correlated with emergence from a 5-cm planting depth in the greenhouse (r = 0.70** and 0.71** for field tests 1 and 2, respectively) and with coleoptile length (r = 0.51** and 0.64**), but not with emergence under laboratory-induced drought stress of −1.1 MPa matric potential (r = −0.05 and 0.13). Experimental error was high for measurements of forage yields in the establishment year (CV = 38% and 36% for field tests 1 and 2, respectively), and resources required to obtain reliable yields would limit testing to a small number of entries. Preliminary screening of a Russian wild ryegrass population for improved seedling vigor could be accomplished by first eliminating plants with small seed size by visual assessment of seed samples. This could then be followed by selection for increased coleoptile length among progeny lines from those plants with medium or large seed.Key words: Russian wild ryegrass, seedling vigor, stand establishment, seed weight, coleoptile length

Tom, Russian wildrye

2003 ◽  
Vol 83 (4) ◽  
pp. 789-791 ◽  
Author(s):  
J. G. McLeod ◽  
P. G. Jefferson ◽  
R. Muri ◽  
T. Lawrence
Keyword(s):  
Seed Weight ◽  
Recurrent Selection ◽  
Agricultural Research ◽  
Seedling Emergence ◽  
Research Centre ◽  
Psathyrostachys Juncea ◽  
Cultivar Description ◽  
Diploid Cultivar ◽  
Russian Wildrye ◽  
Selection For

Tom, a new diploid cultivar of Russian wildrye, Psathyrostachys juncea (Fisch.) Nevski, was developed by the Semiarid Prairie Agricultural Research Centre, Research Branch, Agriculture and Agri-Food Canada, Swift Current, SK. Tom is an eight-clone synthetic developed by recurrent selection for heavy seed weight and improved seedling emergence from deep planting. Tom represents a significant improvement in herbage yielding ability over the check cultivars Swift and Tetracan. Key words: Cultivar description, Russian wildrye, Psathyrostachys juncea (Fisch.) Nevski, seedling emergence, seed weight

Recurrent Selection for Seedling Vigor in Kura Clover

Crop Science ◽  
2001 ◽  
Vol 41 (4) ◽  
pp. 1034-1041 ◽  
Author(s):  
L. R. DeHaan ◽  
N. J. Ehlke ◽  
C. C. Sheaffer
Keyword(s):  
Recurrent Selection ◽  
Seedling Vigor ◽  
Kura Clover ◽  
Selection For
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