SELECTION METHODS FOR SEEDLING VIGOR IN BIRDSFOOT TREFOIL

1971 ◽  
Vol 51 (3) ◽  
pp. 229-235 ◽  
Author(s):  
B. E. TWAMLEY
Keyword(s):  
Recurrent Selection ◽  
Birdsfoot Trefoil ◽  
Seedling Vigor ◽  
Open Pollination ◽  
Selection Methods ◽  
Genotype Group ◽  
Progeny Tests ◽  
Selection For

In 1969, 72 large-seeded lines derived through open pollination were used to establish a seedling vigor test upon which three selection schemes were imposed. First, the best 16 lines were identified and their maternal parents intercrossed to form a selection-by-genotype group. Second, vigorous seedlings were selected out of every fourth line, brought to bloom and interpollinated to form a selection-by-phenotype group. Third, from each of the 16 best lines four vigorous seedlings were selected and later intercrossed to form a selection-by-geno-phenotype group. Using the seeds produced, progeny tests were established to evaluate the germplasm selected by the three methods. The genotype method was effective, straightforward, and reasonably reliable. The geno-phenotype method was more variable in results but potentially more rewarding. The phenotype method was the least desirable. The implications of these results in a program of recurrent selection for seedling vigor are discussed.

MATERNAL INFLUENCE IN BIRDSFOOT TREFOIL ON THE SEEDLING VIGOR OF THE PROGENY

1970 ◽  
Vol 50 (1) ◽  
pp. 103-106 ◽  
Author(s):  
B. E. TWAMLEY
Keyword(s):  
Seed Weight ◽  
Growth Habit ◽  
Morphological Type ◽  
Maternal Influence ◽  
Birdsfoot Trefoil ◽  
Seedling Vigor ◽  
Open Pollination ◽  
Early Type ◽  
The One ◽  
100 Seed Weight

Several hundred two-year-old nursery plants originating in the early-type trefoil cultivar Maitland were rated for flowering maturity, morphological features and growth pattern. Open-pollination seed was collected from these and 100-seed weight determinations were made.The experimental material was organized into two sections for testing purposes. In one, the effect of maternal maturity on the seedling vigor of the progeny was studied and in the other the effect of maternal morphology. Each section was made up of five classes, varying either in maturity or in morphology. Each class contained either nine or ten progeny lines. The range in seed size was similar for all classes. No relationship was found between maturity, morphological type or growth habit of the maternal parent on the one hand and the seedling vigor rating of their progeny at six and ten weeks of age on the other.The breeding implications of these findings are discussed.

OAC Bright birdsfoot trefoil

1997 ◽  
Vol 77 (2) ◽  
pp. 251-253 ◽  
Author(s):  
B. E. Twamley ◽  
D. T. Tomes ◽  
S. R. Bowley
Keyword(s):  
Key Words ◽  
Seed Yield ◽  
Recurrent Selection ◽  
Lotus Corniculatus ◽  
Birdsfoot Trefoil ◽  
Science Department ◽  
Seedling Vigour ◽  
Herbage Yield ◽  
Cultivar Description ◽  
Selection For

OAC Bright is a birdsfoot trefoil (Lotus corniculatus L.) cultivar developed by the Crop Science Department, University of Guelph. It was developed by within and among half-sib progeny recurrent selection for seedling vigour and seed yield. OAC Bright has 2% higher seedling vigour and 0.8% higher herbage yield than Leo. It has similar maturity and persistence to Leo. Key words: Birdsfoot trefoil, cultivar description, seedling vigour, seed yield, recurrent selection

Gamete and recurrent selection for improving physiological resistance to white mold in common bean

2010 ◽  
Vol 90 (2) ◽  
pp. 153-162 ◽  
Author(s):  
H. Terán ◽  
S P Singh
Keyword(s):  
Common Bean ◽  
Recurrent Selection ◽  
Severe Disease ◽  
White Mold ◽  
Progeny Testing ◽  
Selection Methods ◽  
Evolutionary Origins ◽  
Physiological Resistance ◽  
Selection For ◽  
Interspecific Breeding

White mold (WM) is a widely distributed and severe disease of common bean in North America. The objective of this study was to determine the effectiveness of gamete (GS) and recurrent (RS) selection methods for improving WM resistance. Two double-crosses, namely USPT-WM-1/CORNELL 601//USPT-CBB-1/92BG-7 and ‘Chas’/I 9365-25//ABL 15/A 195 were made. Equal numbers of progenies from both crosses were subjected to GS and RS. The GS was practiced from F1 to F4 by selecting WM resistant single plants followed by progeny testing in the subsequent generation. Two cycles of RS were practiced by intermating selected WM resistant plants in each cycle. Thirteen selected families in each method and parents were evaluated at 16, 23, and 33 days post first inoculation in replicated trials in two greenhouse environments. Higher frequencies of families with lower WM scores were obtained from GS than RS. The average genetic gains due to GS and RS were 19.6 and 7.9%, respectively. Employing multiple-parent-crosses involving parents of diverse evolutionary origins delayed WM evaluation, and application of GS are recommended for improving physiological WM resistance in common bean.Key words: Interspecific breeding line, introgressing resistance, multiple-parent crosses, Phaseolus vulgaris, pyramiding resistance, Sclerotinia sclerotiorum

Recurrent Selection for Glyphosate Tolerance in Birdsfoot Trefoil

Crop Science ◽  
1991 ◽  
Vol 31 (5) ◽  
pp. 1124-1129 ◽  
Author(s):  
C. M. Boerboom ◽  
N. J. Ehlke ◽  
D. L. Wyse ◽  
D. A. Somers
Keyword(s):  
Recurrent Selection ◽  
Birdsfoot Trefoil ◽  
Glyphosate Tolerance ◽  
Selection For

GENOTYPIC, PHENOTYPIC, AND GENO-PHENOTYPIC METHODS OF SELECTION FOR SEEDLING VIGOR IN BIRDSFOOT TREFOIL

1972 ◽  
Vol 52 (2) ◽  
pp. 227-232 ◽  
Author(s):  
B. E. TWAMLEY
Keyword(s):  
Combining Ability ◽  
Birdsfoot Trefoil ◽  
Seedling Vigor ◽  
The Third ◽  
Method Selection ◽  
Phenotypic Group ◽  
Phenotypic Method ◽  
Genotypic Group ◽  
Selection For ◽  
Phenotypic Methods

A 72-line, six-replicate seedling vigor test was used to initiate three methods of selection for seedling vigor. In the genotypic method, selection was based on progeny test. In the phenotypic, it was based purely on the vigor of the seedling. In the third or geno-phenotypic method vigorous seedlings were selected from the most vigorous lines. The selected plants were polycrossed within groups and the seed so produced was used to establish new nurseries. From these, seed was collected and comparative seedling vigor tests were undertaken. Heritability tests were also run. The geno-phenotypic group outyielded the genotypic group by an average of 11%. The phenotypic group behaved erratically. Heritability for seedling vigor was low, and for combining ability for seedling vigor, considerably higher. The best method of selecting good germplasm for seedling vigor was to select the most vigorous seedlings from the most vigorous progeny lines.

RECURRENT SELECTION FOR SEED YIELD IMPROVEMENT IN LOTUS CORNICULATUS, CULT LEO

1973 ◽  
Vol 53 (4) ◽  
pp. 811-815 ◽  
Author(s):  
G. S. SANDHA ◽  
B. E. TWAMLEY
Keyword(s):  
Seed Yield ◽  
Recurrent Selection ◽  
No Reduction ◽  
Lotus Corniculatus ◽  
Birdsfoot Trefoil ◽  
Phenotypic Method ◽  
Coefficient Of Variability ◽  
Selection For ◽  
Phenotypic Methods ◽  
Seed Yields

Birdsfoot trefoil (Lotus corniculatus L.), cult Leo, was used as a base population for a recurrent selection program for seed yield. Objectives were: (1) improvement of seed yield, and (2) comparison of a genotypic and a geno-phenotypic method of selection. Two cycles were completed and evaluated. Seed yields for the genotypic and geno-phenotypic methods were 132 and 158%, respectively, of Leo after two cycles of selection. The geno-phenotypic method proved superior to the genotypic after each cycle. The broad sense heritability (61% for cycles 1 and 2), genotypic standard deviation, and genotypic coefficient of variability estimates (16.9 and 15.0% for cycles 1 and 2) indicated no reduction in genotypic variability with the geno-phenotypic method. However, the variability was practically exhausted with the genotypic method after cycle 2. Thus, further improvement with additional cycles of selection should be possible with the geno-phenotypic method but not with the genotypic method.

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
Sign in / Sign up

Export Citation Format

Share Document