General and Specific Combining Ability for Several Agronomic Traits in Diallel Cross Progenies of Cicer Milkvetch 1

Crop Science ◽  
1975 ◽  
Vol 15 (3) ◽  
pp. 341-343 ◽  
Author(s):  
C. E. Townsend
Keyword(s):  
Combining Ability ◽  
Agronomic Traits ◽  
Diallel Cross ◽  
Specific Combining Ability

HETEROSIS, COMBINING ABILITY, AND PREDICTED SYNTHETICS FROM A DIALLEL CROSS IN SUNFLOWERS (HELIANTHUS ANNUUS L.)

1966 ◽  
Vol 46 (1) ◽  
pp. 59-67 ◽  
Author(s):  
Eric D. Putt
Keyword(s):  
Helianthus Annuus ◽  
Combining Ability ◽  
Oil Content ◽  
Diallel Cross ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Helianthus Annuus L ◽  
The Mean ◽  
Seed Characters ◽  
Mature Weight

Heterosis occurred for the eight plant and seed characters studied. It was most frequent for yield of seed and height of plant. Mean squares for general combining ability (gca) and specific combining ability (sca) were significant (P =.01) for all characters. The estimated components for gca were greater than for sca for days to mature, weight per bushel, and percent oil in the seed; less for height and yield of seed; and essentially the same for days to bloom, diameter of head, and weight per 1000 seeds.The yield of seed and percent oil in the seed, for the highest ranking 100 synthetics that could be composed from the 10 lines, was predicted in F6 assuming 50 and 60% outcrossing between F2 and F6. Virtually all values exceeded the mean performance of four check samples of commercial hybrids. Many exceeded the highest rank check for oil content in the seed. Fourteen of the highest ranking 100 synthetics for yield and 30 for oil content consisted of two or three lines. It was concluded that synthetics can be superior to the present hybrids in heterosis and that desirable synthetics can be made from only a few lines.

GENERAL AND SPECIFIC COMBINING ABILITY IN SEVEN INBRED STRAWBERRY LINES

1968 ◽  
Vol 10 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Lewis E. Aalders ◽  
Donald L. Craig
Keyword(s):  
Genetic Variation ◽  
Powdery Mildew ◽  
Combining Ability ◽  
Diallel Cross ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Additive Genetic Variation

Seedlings of a diallel cross of seven strawberry inbreds omitting reciprocals were fruited in matted rows. Per acre fruit yields were comparable with leading cultivars, but berry appearance and quality of the hybrids were poor. Differences in resistance to powdery mildew reflected the values of the cultivars from which the inbreds were derived.All four characters studied showed significant general combining ability values, and three of the four showed significant specific combining ability values. These results are consistent with previous findings of considerable amounts of non-additive genetic variation in the strawberry.

THE ANALYSIS OF HERITABLE VARIATION FOR THREE AGRONOMIC TRAITS IN A 6-VARIETY DIALLEL OF GRAIN SORGHUM, SORGHUM VULGARE PERS.

1968 ◽  
Vol 10 (2) ◽  
pp. 460-469 ◽  
Author(s):  
George H. L. Liang ◽  
E. G. Heyne ◽  
J. H. Chung ◽  
Y. O. Koh
Keyword(s):  
Grain Yield ◽  
Protein Content ◽  
Combining Ability ◽  
Agronomic Traits ◽  
Regression Line ◽  
Heritability Estimate ◽  
Specific Combining Ability ◽  
Heritable Variation ◽  
Partial Dominance ◽  
Unit Slope

Analysis of a six-variety diallel indicates that both general and specific combining ability were important for anthesis time and that specific combining ability seems more important for grain yield. Significant interactions were observed between general combining ability and locations for yield, anthesis time, and protein content while significant interaction between specific combining ability and locations was observed for protein content only.For grain yield, overdominance was indicated by the (H1/D)½ ratio; at least four groups of genes were involved in controlling yield. Heritability estimate was slow. For anthesis time, a partial dominance was indicated. Approximately three groups of genes controlled anthesis; heritability estimate was high. For protein content, a partial dominance was noted. Two groups of genes were estimated for control of protein content; heritability estimate was intermediate.The regression coefficients for the three characters were less than 1, but only that for protein content was significantly so. The deviation of the regression line from unit slope may indicate the ptesence of either epistasis or correlated gene distribution or both in the materials tested.

Diallel analysis of yield and yield components of winged bean (Psophocarpus tetragonolobus (L.) D.C.)

1986 ◽  
Vol 106 (3) ◽  
pp. 485-490 ◽  
Author(s):  
H. N. De Silva ◽  
A. Omran
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Yield Components ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Winged Bean ◽  
Specific Combining Ability ◽  
Psophocarpus Tetragonolobus ◽  
Equal Importance ◽  
Yield And Yield Components

SummaryThe variability revealed in a half-diallel cross between nine diverse genotypes of winged bean (Psophocarpus tetragonolobus (L.) D.C.) in regard to yield and yield components was studied in the F1 generation. The results indicated that high genetic variability existed for all traits. With respect to seed size, general combining ability effects alone were adequate to predict the performance of hybrids. For numbers of pods per plant and seeds per pod, both general and specific combining ability effects were of equal importance, while the performance of hybrids for grain yield was mainly dependent on specific combining ability effects. Heterosis was clearly evident for number of seeds per pod and grain yield. Of the yield components, number of pods per plant exhibited a positive genotypic association of appreciable magnitude with grain yield, showing its usefulness as an indicator of yield in selection.

Genetic analysis of quantitative characters in cigar and pipe tobacco, Nicotiana tabacum. III. Economic indices: grade index, yield, and crop revenue

1983 ◽  
Vol 25 (2) ◽  
pp. 185-189 ◽  
Author(s):  
I. S. Ogilvie ◽  
V. Kozumplik
Keyword(s):  
Nicotiana Tabacum ◽  
Combining Ability ◽  
Diallel Cross ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Total Alkaloids ◽  
Nicotiana Tabacum L ◽  
Economic Indices ◽  
Grade Index ◽  
Pipe Tobacco

A diallel cross of four cigar cultivars and one pipe tobacco (Nicotiana tabacum L.) cultivar was analyzed for the following parameters: grade index, yield, crop revenue or index, percentage of nicotine, percentage of total alkaloids, and susceptability to pole rot. The experiment was performed over 3 years. Analysis was done for general combining ability and specific combining ability. General combining ability was greater than specific combining ability for all variables although significant specific combining ability effects were also present for all parameters with the exception of nicotine and total alkaloids. Reciprocal effects were completely absent. The line Pennbel 69 showed a positive general combining ability effect for yield, crop index, and infestation by pole rot and a high negative general combining ability effect for grade index and percentage of nicotine and total alkaloids. Petit Havane showed a complete reverse of general combining ability effects for these parameters while the other three cultivars were intermediate. High positive specific combining ability effects for grade index, yield, and crop index and high negative specific combining ability effects for the percentage of pole rot were shown by crosses of Pennbel 69.

A diallel cross in black spruce

Genome ◽  
1987 ◽  
Vol 29 (1) ◽  
pp. 180-186 ◽  
Author(s):  
T. J. B. Boyle
Keyword(s):  
Combining Ability ◽  
Variance Components ◽  
Genetic Variance ◽  
Black Spruce ◽  
Diallel Cross ◽  
Specific Combining Ability ◽  
Environment Interaction ◽  
Forest Genetics ◽  
Data Set ◽  
Dominance Genetic Variance

A complete 7 × 7 diallel of black spruce (Picea mariana (Mill.) B.S.P.), without selfs, planted in three locations, was measured for height growth at several ages. Analysis using Griffing's method 3, model II, demonstrated that general combining ability (GCA) was the dominant genetic component of variation, although specific combining ability (SCA) appeared to be proportionately increasing in importance with age. When data from all locations were combined, the GCA × environment interaction proved to be highly significant. If the trend of increasing proportional importance of SCA continues, existing improvement strategies exploiting only GCA may need to be radically altered. Greater genetic gain would result from crosses among a few clones of high specific combining ability. Whatever approach is used, it appears likely that genotypes will have to be carefully matched to sites. Imbalance in the data set appeared to invalidate F-tests. As a result of heterozygosity in the parents and the likely presence of epistasis and linkage disequilibrium, the interpretation of GCA and SCA variance components in terms of additive and dominance genetic variance cannot be made. Key words: diallel cross, combining ability, black spruce, forest genetics.

Combining ability in Glycine javanica

1968 ◽  
Vol 19 (3) ◽  
pp. 411 ◽  
Author(s):  
JG Wutoh ◽  
WM Hutton ◽  
AJ Pritchard
Keyword(s):  
Combining Ability ◽  
Genetic Correlations ◽  
Diallel Cross ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Forage Yield ◽  
Maturity Date ◽  
Stolon Length ◽  
Breeding Programmes ◽  
Stolon Development

A diallel cross of five accessions was used to estimate general and specific combining ability for nine traits in Glycine javanica L. Variation due to both general and specific combining ability was highly significant but the general combining ability component of variance was larger than the specific combining ability component for flowering time, maturity date, and seed weight. For yield, stolon length, stolon number, and percentage of stolons rooted the specific combining ability component was the larger. The cultivar Tinaroo had a high general combining ability and a low specific combining ability for most traits associated with forage yield and should be a valuable parent in future breeding programmes. Negative genetic correlations between yield and some traits associated with stolon development indicate that it may not be possible to produce a variety with all desirable characters from a breeding programme based on the five accessions used.

STUDIES ON COMBINING ABILITY IN STRAWBERRY (FRAGARIA × ANANASSA): I. NUMBER OF INFLORESCENCES, NUMBER OF FLOWERS, DAYS TO MATURITY AND NUMBER OF FRUITS

1981 ◽  
Vol 23 (3) ◽  
pp. 373-378 ◽  
Author(s):  
Shri Dhar Lal ◽  
Jitendra Nath Seth
Keyword(s):  
Combining Ability ◽  
Diallel Cross ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Fragaria Ananassa ◽  
Specific Combination ◽  
Cytoplasmic Effects ◽  
Days To Maturity ◽  
Complete Diallel Cross

A 10 × 10 complete diallel cross was carried out in the strawberry (Fragaria × ananassa Duch.). Significant general (gca) and specific combining ability (sea) effects were recorded. The variances due to general combining ability exceeded the variances due to specific combining ability. Cytoplasmic effects were also noted. The variety Kalimpong Local was found to be a good general combiner for number of inflorescences, number of flowers and number of fruits. The variety Albritton had highest gca effect for number of inflorescences. The variety Premier was a good general combiner for number of flowers. The Redcoat showed highest gca effect for days to maturity. The best specific combination for number of inflorescences was Phenomenal × Jeolikote Local in F1 and Premier × Kalimpong Local in F2. For number of fruits Albritton × Kalimpong Local and Premier × Cavalier were the best.

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