Responses to divergent selection for adventitious root growth in red clover (Trifolium pratense L.)

Euphytica ◽  
1991 ◽  
Vol 58 (2) ◽  
pp. 119-127 ◽  
Author(s):  
J. M. Montpetit ◽  
B. E. Coulman
Keyword(s):  
Root Growth ◽  
Adventitious Root ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Divergent Selection ◽  
Trifolium Pratense L ◽  
Selection For

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

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.

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

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

Maternal Line Selection for Persistence in Red Clover, Trifolium pratense L. 1

Crop Science ◽  
1967 ◽  
Vol 7 (3) ◽  
pp. 264-266 ◽  
Author(s):  
A. Mokhtarzadeh ◽  
R. C. Leffel ◽  
E. H. Beyer
Keyword(s):  
Trifolium Pratense ◽  
Red Clover ◽  
Maternal Line ◽  
Trifolium Pratense L ◽  
Line Selection ◽  
Selection For

Selection for resistance to root rot caused by Fusarium spp. in red clover (Trifolium pratense L.)

1995 ◽  
Vol 75 (1) ◽  
pp. 141-146 ◽  
Author(s):  
B. E. Coulman ◽  
M. Lambert
Keyword(s):  
Root Rot ◽  
Adventitious Roots ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Progeny Testing ◽  
Fusarium Spp ◽  
Fusarium Root Rot ◽  
Disease Reaction ◽  
Trifolium Pratense L ◽  
Selection For

Root and crown rots caused by Fusarium spp. are a major cause of stand decline of red clover (Trifolium pratense L.) in North America. The goal of this study was to evaluate the effectiveness of one cycle of selection for resistance to Fusarium root rot. Plants of the red clover cultivars Florex and Arlington were screened for their resistance to infection by two isolates of Fusarium acuminatum and one isolate of F. avenaceum. Plants of various infection categories were intercrossed, and progenies were screened to estimate the heritability of resistance to these pathogens. Synthetics produced by intercrossing either highly resistant (R) or highly susceptible plants were evaluated under sward conditions in the field for dry matter yield, root rot and adventitious root development. There were significant (P = 0.05) differences in aggressiveness among the three Fusarium isolates used, with F. avenaceum 814 being the most aggressive. Plants classed as R for all three isolates were found in both cultivars; however, disease reaction was not always correlated among the isolates. Parent-progeny regressions or correlations of disease reaction were negative in the cultivar Arlington, while for Florex, a relatively low regression coefficient of 0.26 was found. In the field evaluation in the fall of the third year after seeding, synthetics of plants selected for resistance were either not different from, or higher in infection score than the parental cultivars, indicating that selection using one or two isolates/species was ineffective in improving field root rot resistance. Plants with more severely rotted roots showed a tendency to produce more adventitious roots from the crown. It was concluded that progeny testing would be necessary for selection to be effective for resistance to Fusarium root rot in red clover and that more that one isolate or species of the fungus should be used in screening programs. In addition, not all populations of red clover contain sufficient genetic variation for resistance to justify a selection program. Key words: Red clover, disease resistance, selection, root rot, adventitious roots, Trifolium pratense L., Fusarium spp.

Sign in / Sign up

Export Citation Format

Share Document