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

scholarly journals The communities of fungi occurring in the red clover (Trifolium pratense L.) and red clover with cocksfoot grass (Dactylis glomerata L.) cultivations on the lowland

2014 ◽  
Vol 15 (1) ◽  
pp. 61-73 ◽  
Author(s):  
Wanda Truszkowska ◽  
Barbara Kalińska
Keyword(s):  
Fusarium Oxysporum ◽  
Trifolium Pratense ◽  
Dactylis Glomerata ◽  
Red Clover ◽  
Pathogenic Fungi ◽  
Fungal Communities ◽  
Trifolium Pratense L ◽  
Dactylis Glomerata L

Knowledge of fungal communities within cultures of clover planted into barley and clover with cocksfoot grass may be used to evaluate the antiphytopathogenic potential of the environment. Observation of the lack of common pathogenic fungi and the sensitivity of <i>Fusarium oxysporum</i> populations to agroecological conditions indicates the possibility of influencing the healthiness of the clover by agrotechnical methods.

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

BYTOWN RED CLOVER

1980 ◽  
Vol 60 (3) ◽  
pp. 1041-1043 ◽  
Author(s):  
W. R. CHILDERS ◽  
W. D. DICKSON
Keyword(s):  
Trifolium Pratense ◽  
Red Clover ◽  
Research Station ◽  
Dairy Production ◽  
Northern Areas ◽  
Trifolium Pratense L ◽  
Seed Increase

Bytown is a tetraploid cultivar of Trifolium pratense L., developed at the Agriculture Canada Research Station, Ottawa, Ontario. The cultivar has larger leaves, stems and floral parts than its parent Ottawa diploid variety. It has shown greater persistence in Northern areas of Ontario and Quebec and will be used in dairy production as haylage. The SeCan Association will be responsible for seed increase and distribution. It was licensed in March 1979 and pedigree seed will be available to farmers in the spring of 1981.

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

Gametophyte development in Trifolium pratense L

1964 ◽  
Vol 12 (1) ◽  
pp. 1 ◽  
Author(s):  
GJ Hindmarsh
Keyword(s):  
Trifolium Pratense ◽  
Embryo Sac ◽  
Red Clover ◽  
Common Occurrence ◽  
Pollen Abortion ◽  
Male And Female ◽  
Sequence Of Events ◽  
Trifolium Pratense L ◽  
Selection For ◽  
High Seed Yield

Development of the male and female gametophytes is traced in detail, and departures from the normal sequence of events are found at several points. Among these are pollen abortion, failure of the archesporial cell to develop in the ovule, and collapse of the embryo sac during its development. The formation of two embryo sacs per ovule is of relatively common occurrence, and this is followed by the breakdown of one or both of them. In addition, either the egg apparatus degenerates before fertilization or the nucellar plug may fail to disintegrate and so form a barrier to the passage of the pollen tube through the micropyle. The occurrence of an ovule in which an embryo sac was developing apomictically suggests that a breeding programme based on selection for somatic apospory, rather than high seed yield from sexually reproducing plants, would probably produce a strain of red clover which could maintain itself in pastures.

AC Kingston red clover

1994 ◽  
Vol 74 (1) ◽  
pp. 149-150
Author(s):  
T. M. Choo ◽  
B. R. Christie
Keyword(s):  
Key Words ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Forage Yield ◽  
Mass Selection ◽  
Research Station ◽  
Trifolium Pratense L ◽  
Cultivar Description ◽  
Diploid Cultivar ◽  
Harvest Year

AC Kingston red clover (Trifolium pratense L.) is a diploid cultivar of the double-cut type developed by mass selection at the Agriculture Canada Research Station, Charlottetown, PEL It is similar to Florex in maturity, but is superior in forage yield in the second harvest year. It was selected for persistence under field conditions. Key words: Red clover, Trifolium pratense L., persistence, cultivar description

Use of a cellulolytic enzyme digestion technique to distinguish bloat-causing from non-bloat-causing legumes and to select for speed of mesophyll cell-wall disintegration in red clover (Trifolium pratense L.)

1982 ◽  
Vol 98 (1) ◽  
pp. 99-102 ◽  
Author(s):  
F. I. Sant ◽  
D. Wilson
Keyword(s):  
Cell Wall ◽  
Cell Walls ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Mesophyll Cell ◽  
Cellulolytic Enzyme ◽  
Cellulase Digestion ◽  
Digestion Technique ◽  
Trifolium Pratense L ◽  
Selection For

SUMMARYCell walls of three bloat-causing legumes, lucerne, red clover and white clover tended to be thinner and disintegrated significantly (P < 0·05) faster during cellulase digestion than those of two non-bloat-causing legumes, sainfoin (reported to contain tannins) and cicer milkvetch (reported not to contain tannins). Response to one generation of selection for speed of mesophyll cell-wall disintegration was marked in a diploid red clover (h2 = 0·66, 1·13) but slight in a tetraploid (h2 = 0·10, 0·13).

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

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