Selection for persistence in red clover

1999 ◽  
Vol 79 (3) ◽  
pp. 357-359 ◽  
Author(s):  
B. R. Christie ◽  
R. A. Martin
Keyword(s):  
Key Words ◽  
Root System ◽  
Recurrent Selection ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Field Conditions ◽  
Fibrous Root ◽  
Phenotypic Recurrent Selection ◽  
Trifolium Pratense L ◽  
Selection For

To increase the persistence of red clover (Trifolium pratense L.), phenotypic recurrent selection was conducted under field conditions. After three cycles of selection, a strain designated as CRS-16, was developed. This strain has better persistence than the check cultivars, Florex and Marino, and has a more fibrous root system. Among 4-yr-old plants, about 10% initiated new shoots from below the crown. Key words: Red clover, Trifolium pratense L. persistence, root type

AC Charlie red clover

1994 ◽  
Vol 74 (4) ◽  
pp. 825-826 ◽  
Author(s):  
T. M. Choo ◽  
B. R. Christie ◽  
G. F. Bélanger ◽  
Y. A. Papadopoulos ◽  
S. Kilyanek
Keyword(s):  
Key Words ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Mass Selection ◽  
Severe Winter ◽  
Winter Conditions ◽  
Trifolium Pratense L ◽  
Cultivar Description ◽  
Selection For ◽  
Forage Yields

The red clover (Trifolium pratense L.) cultivar, AC Charlie, is a diploid of the early or double-cut type. It was developed by two cycles of mass selection for persistence and vigour. Forage yields after severe winter conditions indicate that AC Charlie is more winterhardy than Florex in Atlantic Canada. It is similar in maturity to Florex and 3–4 d later than Marino. Key words: Cultivar description, red clover, AC Charlie

RESPONSE TO SELECTION FOR STEM LENGTH IN RED CLOVER EVALUATED AT WIDE AND NARROW SPACINGS

1984 ◽  
Vol 64 (4) ◽  
pp. 925-934 ◽  
Author(s):  
S. R. BOWLEY ◽  
N. L. TAYLOR ◽  
P. L. CORNELIUS ◽  
C. T. DOUGHERTY
Keyword(s):  
Recurrent Selection ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Stem Length ◽  
Yield Response ◽  
Response To Selection ◽  
Breeding Programs ◽  
Herbage Yield ◽  
Trifolium Pratense L ◽  
Selection For

Six cycles of phenotypic recurrent selection for stem length were conducted in a 91-cm-spaced planted population of red clover (Trifolium pratense L.) as a means of increasing herbage yield. The objectives of this investigation were (1) to compare the effectiveness of selection for stem length tested in transplants at wide (91 cm) and narrow (7 cm) spacings, and in row seedings and (2) to determine the effect of selection for stem length on herbage yield. Response to selection for stem length was obtained under all plantings; however, greater gains were observed at the wide transplant spacing (3.3 cm∙cycle−1) compared to the narrow transplant spacing (0.7 cm∙cycle−1) and row seeding (0.8 cm∙cycle−1). Densely spaced transplants gave performance similar to row seedings and may be of value to forage crop breeders in situations where yield or quality assessment is desired but seed supplies are insufficient for the establishment of seeded plots, such as in the early stages of breeding programs. Selection for stem length was effective in increasing herbage yield at first harvest but was associated with reduced persistance, decreased regrowth yields, and increased partitioning of dry matter towards the shoot rather than the root during seedling development. Selection for stem length in the regrowth or in the second year, rather than in the primary (seedling) growth, might have avoided the declines in persistence and regrowth yields.Key words: Trifolium pratense L., red clover, recurrent selection, stem length, density, herbage yield

scholarly journals Forage yield and persistence of red clover progenies in two environments

2003 ◽  
Vol 60 (3) ◽  
pp. 447-452 ◽  
Author(s):  
Daniel Portella Montardo ◽  
Miguel Dall'Agnol ◽  
Nilton Rodrigues Paim
Keyword(s):  
Dry Matter ◽  
Recurrent Selection ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Forage Yield ◽  
Winter Period ◽  
Forage Production ◽  
Growing Seasons ◽  
Trifolium Pratense L ◽  
Physiographic Regions

Red clover (Trifolium pratense L.) is one of the most important temperate legume species, used to lessen the lack of forage during the critical fall-winter period in Rio Grande do Sul, RS, Brazil. However, its utilization has been restricted mainly because of its lack of persistence. This work evaluates the dry matter yield and persistence of red clover half-sib progenies in two physiographic regions of RS: "Depressão Central", in Eldorado do Sul and "Encosta Superior do Nordeste", in Veranópolis. Experiments were carried out for two growing seasons and results were compared to two red clover commercial checks, Qüiñequeli and Estanzuela 116. The region of Veranópolis was more adequate for red clover forage production, enabling better yield and persistence. The best check for both locations was cultivar Estanzuela 116. At Eldorado do Sul persistence was highly affected and some progenies were superior to the best check. At Veranópolis the best check was very productive, with good persistence. The best progenies at both locations were selected to be propagated and submitted to additional recurrent selection cycles.

Selection for resistance to Fusarium wilt in red clover

1999 ◽  
Vol 79 (3) ◽  
pp. 351-356 ◽  
Author(s):  
B. C. Venuto ◽  
R. R. Smith ◽  
C. R. Grau
Keyword(s):  
Fusarium Oxysporum ◽  
Fungal Pathogen ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Severity Index ◽  
Research Station ◽  
Vascular Wilt ◽  
Trifolium Pratense L ◽  
Selection For ◽  
Overall Resistance

In Wisconsin, Fusarium oxysporum, Schlect., a pathogen causing vascular wilt, is the most prevalent fungal pathogen recovered from diseased red clover (Trifolium pratense L.) plants. This study was conducted to determine the mode of inheritance for red clover resistance to this pathogen and to develop resistant germplasm. Virulent isolates of this pathogen, collected from red clover plants at the Ashland Research Station, Ashland, Wisconsin, were used to screen three populations, the red clover cultivars Arlington and Marathon and the C11 germplasm, for resistant plants. Plants were inoculated with the pathogen and evaluated for reaction, using a disease-severity index (DSI) score from 1 to 5 (1 = no reaction, 5 = plant dead). Selected plants from each cycle were intercrossed to produce subsequent generations. After two and three cycles of selection, the developed populations were simultaneously evaluated for gain from selection. The gain from selection for resistance in these populations (cycle 0 minus cycle 2) ranged from 0.31 to 0.48, 0.12 to 0.75, and 0.13 to 0.83 DSI units, respectively, for Arlington, Marathon, and C11. Estimated narrow-sense heritabilities, based on cycle-1 and cycle-2 progeny, were, respectively, 0.20 and 0.37 for Arlington, 0.15 and 0.13 for Marathon, and 0.06 and 0.17 for C11. These results indicate that resistance is a quantitative trait controlled by many loci, each contributing some portion to overall resistance in the host. Key words: Red clover, Trifolium pratense L., Fusarium oxysporum, vascular wilt, resistance

COMPARISON OF YIELD COMPONENTS OF RED CLOVER AND ALFALFA

1988 ◽  
Vol 68 (1) ◽  
pp. 103-114 ◽  
Author(s):  
S. R. BOWLEY ◽  
C. T. DOUGHERTY ◽  
N. L. TAYLOR ◽  
P. L. CORNELIUS
Keyword(s):  
Medicago Sativa ◽  
Yield Components ◽  
Trifolium Pratense ◽  
Total Yield ◽  
Red Clover ◽  
Herbage Yield ◽  
Trifolium Pratense L ◽  
Medicago Sativa L ◽  
Stem Development ◽  
Selection For

Yield components of five regrowth cycles, two in 1981 and three in 1982, of three red clover (Trifolium pratense L.) populations and three alfalfa (Medicago sativa L.) cultivars were compared in swards. Red clover left more stubble but produced less herbage and accumulated total yield (herbage, stubble and 10 cm depth root) at a slower rate than alfalfa during most regrowths. The percent leaf at flowering of red clover was similar to that of alfalfa. Maximum LAI declined during successive regrowths each year. Maximum crop growth rates were 30 and 34 g m−2 d−1 for red clover and alfalfa, respectively. Stem development (canopy height) followed patterns of accumulation of herbage yield. The initiation of stems was slower in red clover and stem populations were less than that of alfalfa. Selection for faster stem initiation rates, higher stem populations, and reduced partitioning of dry matter towards stem bases which would be left as stubble were suggested as ways of increasing the herbage yield of red clover.Key words: Trifolium pratense L., Medicago sativa L., yield components, growth analysis clover (red), alfalfa

AC Endure red clover

1998 ◽  
Vol 78 (1) ◽  
pp. 113-114 ◽  
Author(s):  
B. R. Christie ◽  
T. M. Choo ◽  
Y. A. Papadopoulos ◽  
J. Lewis ◽  
R. Michaud
Keyword(s):  
Key Words ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Forage Yield ◽  
Research Centre ◽  
Mass Selection ◽  
Trifolium Pratense L ◽  
Cultivar Description ◽  
Diploid Cultivar

AC Endure red clover (Trifolium pratense L.) is a diploid cultivar of the double-cut type developed by mass selection at the Crop and Livestock Research Centre, Agriculture and Agri-Food Canada, Charlottetown, PEI. It is earlier flowering than Florex or Marino, and higher in forage yield, especially in the second and third harvest years. Key words: Red clover, Trifolium pratense L., cultivar description

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