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.

HERITABILITY FOR COMBINING ABILITY OF SEEDLING VIGOR IN BIRDSFOOT TREFOIL

1972 ◽  
Vol 52 (6) ◽  
pp. 1059-1065 ◽  
Author(s):  
B. E. TWAMLEY
Keyword(s):  
Seed Size ◽  
Combining Ability ◽  
Gene Action ◽  
Birdsfoot Trefoil ◽  
Seedling Vigor ◽  
Additive Gene Action ◽  
Predictive Values ◽  
Additive Gene ◽  
Estimate Heritability ◽  
Selection Of

Twenty birdsfoot trefoil families were studied, first, to investigate variation in seed size and seedling vigor; second, to determine predictive values of parental performance; and third, to estimate heritability for combining ability. The experimental material consisted of open-pollination seed collected from 20 parents and 10 daughters of each. It was examined for seed size and was used for a seedling vigor test. Wide variation for both seed size and for seedling vigor existed both within and among families. The performance of the parents with respect to neither seed size nor seedling vigor was a valid indicator of the combining ability of the daughters. Heritability for these traits was low. In the discussion, the postulate was made that in selecting material for the Syn 0 generation of a new cultivar on the basis of combining ability, greater emphasis should be placed on additive gene action. The program would involve the selection of only those plants that, in addition to being high in combining ability themselves, had offspring with a high combining ability average.

AC Langille birdsfoot trefoil

1997 ◽  
Vol 77 (4) ◽  
pp. 653-654 ◽  
Author(s):  
Y. A. Papadopoulos ◽  
T. M. Choo ◽  
B. R. Christie ◽  
W. G. Thomas ◽  
D. B. McKenzie ◽  
...  
Keyword(s):  
Lotus Corniculatus ◽  
Forage Yield ◽  
Birdsfoot Trefoil ◽  
Mass Selection ◽  
Original Material ◽  
Seedling Vigor ◽  
Science Department ◽  
Cultivar Description ◽  
Selection For ◽  
The University

AC Langille is a birdsfoot trefoil (Lotus corniculatus L.) cultivar developed by the Nappan Research Farm, Agriculture and Agri-Food Canada. It was developed through two cycles of mass selection for winterhardiness and one cycle of mass selection for seedling vigor. The original material was six distinct germplasms selected from the cultivar Leo and released from the Crop Science Department of the University of Guelph. AC Langille is superior to the check cultivar Leo in forage yield and seedling vigor in Atlantic Canada. Key words: Birdsfoot trefoil, Lotus corniculatus, cultivar description, seedling vigor

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.

INHERITANCE OF NECTAR PRODUCTION IN BIRDSFOOT TREFOIL

1982 ◽  
Vol 62 (1) ◽  
pp. 101-105 ◽  
Author(s):  
DOROTHY C. MURRELL ◽  
DWIGHT T. TOMES ◽  
R. W. SHUEL
Keyword(s):  
Analysis Of Variance ◽  
Combining Ability ◽  
Breeding Population ◽  
General Combining Ability ◽  
Birdsfoot Trefoil ◽  
Broad Sense Heritability ◽  
Response To Selection ◽  
Inheritance Pattern ◽  
Nectar Production ◽  
Selection For

Significant differences in nectar production were observed among seven cultivars and one germplasm release of birdsfoot trefoil (Lotus corniculatus L.). The cultivars Carroll and Leo were consistently higher and Maitland consistently lower in μ1 nectar/umbel produced. Nectar production varied significantly among genotypes within cultivars and germplasm. Four parents, two high and two low nectar producers, were crossed in a diallel to determine the inheritance pattern for nectar production. The progeny of these crosses were near the midparent values. General combining ability effects were highly significant while specific combining ability were unimportant. Broad sense heritability was 92%. The heritability estimates from the analysis of variance were used to predict response to selection in a breeding population. The results indicated that selection for low nectar production would be more effective than selection for high nectar production.

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