SEED SIZE AND SEEDLING VIGOR IN BIRDSFOOT TREFOIL

1967 ◽  
Vol 47 (5) ◽  
pp. 603-609 ◽  
Author(s):  
B. E. Twamley
Keyword(s):  
Seed Size ◽  
Forage Yield ◽  
Birdsfoot Trefoil ◽  
Seedling Vigor ◽  
Open Pollination ◽  
Original Population ◽  
Screening Techniques ◽  
Laboratory Screening ◽  
The Relationship ◽  
Made In

The relationship between seed size and seedling vigor in the field and greenhouse was determined for European-type birdsroot trefoil (Lotus corniculatus L).Sixty-four open-pollination progeny lines drawn from a nursery of 2,000 plants were grouped, on the basis of seed size, into eight classes each having eight lines. The largest-seeded lines were about twice as heavy as the smallest. Seedings were made in the greenhouse and in two field sites and the lines were evaluated visually and by weight for seedling vigor.The larger-seeded lines, on the average, outperformed the smaller ones but even they contained some poorer material. However, the best six lines all originated in the three larger-seeded classes. Forage yield in the greenhouse at six weeks of age provided a good index for predicting seedling vigor in the field.Suggestions are made for carrying out a breeding program aimed at developing a strain of trefoil excelling in seedling vigor. The scheme envisages the use of two laboratory screening techniques destined to eliminate all but the most vigorous lines and thereby to reduce the number of lines to be field-tested to 10% of the original population.

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.

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

SEEDLING VIGOR STUDIES IN MORSHANSK BIRDSFOOT TREFOIL

1969 ◽  
Vol 49 (2) ◽  
pp. 203-208 ◽  
Author(s):  
B. E. Twamley
Keyword(s):  
Seed Size ◽  
Birdsfoot Trefoil ◽  
Seedling Vigor ◽  
Russian Strain ◽  
Unselected Population

Progenies of 60 birdsfoot trefoil plants out of the Russian strain Morshansk which differed in maturity, seed load, and seed size were evaluated for speed of germination, seedling vigor, and rate of tillering.The results indicated that, first, seed load is unlikely to affect greatly the seed size and seedling vigor of the progeny; secondly, late-maturing strains with good seedling vigor can be found; thirdly, in a population of progeny lines, 80% of the lines may be discarded on the basis of seed size without serious danger of discarding much good seedling vigor germplasm; fourthly, plants arising from large seeds had a pronounced tendency to tiller early; and, fifthly, speed of germination may be of considerable value in detecting lines with good seedling vigor in an unselected population, but is of limited value for that purpose within the large-seeded fraction of the population.

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.

CREE BIRDSFOOT TREFOIL

1981 ◽  
Vol 61 (1) ◽  
pp. 163-165 ◽  
Author(s):  
B. P. GOPLEN ◽  
J. E. R. GREEN-SHIELDS
Keyword(s):  
Seed Yield ◽  
Lotus Corniculatus ◽  
Forage Yield ◽  
Birdsfoot Trefoil ◽  
Research Station ◽  
Western Canada ◽  
Seedling Vigor ◽  
Plant Products

Cree, a new cultivar of birdsfoot trefoil (Lotus corniculatus L.), was developed at the Agriculture Canada research Station in Saskatoon and was issued License No. 1901 by the Plant Products Division of Agriculture Canada on 28 Feb. 1979. It is the first cultivar of birdsfood trefoil bred in Western Canada and was selected mainly for winterhardiness and forage yield. It was extensively tested in Uniform Regional Tests across Western Canada from 1960 to 1975, and was found to be superior to Empire in forage yield, seed yield, and seedling vigor, and superior to Leo in seed yield.

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