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.

scholarly journals GENERAL AND SPECIFIC COMBINING ABILITY IN SUNFLOWER (Helianthus annuus L.) / APTITUD COMBINATORIA GENERAL Y ESPECÍFICA EN EL GIRASOL (Helianthus annuus L.) / APTITUDE À LA COMBINATION GENERAL ET SPECIFIQUE CHEZ LE TOURNESOL (Helianthus annuus L.)

Helia ◽  
2001 ◽  
Vol 24 (34) ◽  
pp. 1-16 ◽  
Author(s):  
Domenico Laureti ◽  
Andrea Del Gatto
Keyword(s):  
Helianthus Annuus ◽  
Combining Ability ◽  
Central Italy ◽  
Specific Combining Ability ◽  
First Year ◽  
Male Sterile ◽  
Breeding Programs ◽  
East Central ◽  
Helianthus Annuus L ◽  
Selection For

SUMMARYA total of 245 test cross progenies obtained by crossing cytoplasmic male sterile (CMS) lines and restorer (RHA) lines were evaluated in replicated trials in 1995 and 1997. Experiments were carried out in two locations (Osimo, East Central Italy and Budrio, Northern Italy) in 1995, whereas in 1997 trials were conducted only in Osimo. General combining ability (GCA) and specific combining ability (SCA) of the parents was evaluated to identify genotypes suitable to be used as testers for breeding programs and to verify the performance of hybrids. The results obtained in 1995 were used to make test crosses in 1996 to be evaluated in 1997. The GCA and SCA of RHA and CMS lines were nearly always significant for all the studied traits when lines were randomly taken in 1995. When selected testers were used on the basis of the results of the first year, the SCA of new RHA lines and GCA of new CMS lines were not significant for achene yield, but they were for the other traits.The best GCA estimates for RHA were often higher than those of CMS, indicating that selection for RHA could be more useful than for CMS. As expected, GCA was always lower than SCA. CMS and RHA, with high variance among their test crosses for yield and many other traits, could be used as testers. The lack of a tester with high variance in all traits requires more than one tester in evaluating lines. The GCA of a line can change in function of the germplasm with which it is combined.

scholarly journals Association between Griffing's diallel and the adaptability and stability of Eberhart and Russel

1999 ◽  
Vol 22 (3) ◽  
pp. 451-456 ◽  
Author(s):  
Cleso Antônio Patto Pacheco ◽  
Cosme Damião Cruz ◽  
Manoel Xavier dos Santos
Keyword(s):  
Combining Ability ◽  
General Combining Ability ◽  
Genetic Effects ◽  
Specific Combining Ability ◽  
Regression Coefficients ◽  
Stability Parameters ◽  
The Mean ◽  
Additive Genetic Effects ◽  
F1 Cross

The objective of the present work was to provide a methodology to study the inheritance of adaptability and stability through the breakdown of Eberhart and Russell regression coefficients and regression deviations in effects due to the mean and additive genetic effects (gi's and gj's) as well as dominance effects (sij's) of Griffing´s methodology, when the diallel is conducted in several environments. It was concluded that the adaptability and stability parameters are determined in the same manner as are genetic effects. So an F1 cross inherits half the general combining ability (GCA) mean effect from each parent, while the effects due to specific combining ability (SCA) are subjected to the same considerations relative to sij's, i.e., they are dependent on specific combinations.

scholarly journals Identification of Restorers with Desirable General Combining Ability from among New Inbred Lines of Sunflower (Helianthus annuus L.)

2020 ◽  
Vol 9 (12) ◽  
pp. 2923-2932
Author(s):  
S. D. Nehru ◽  
Akshata Timmanna Budihal ◽  
M. S. Umar Farooq ◽  
Y. G. Shadakshari ◽  
M. S. Uma ◽  
...  
Keyword(s):  
Helianthus Annuus ◽  
Combining Ability ◽  
Inbred Lines ◽  
General Combining Ability ◽  
Helianthus Annuus L

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.

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.

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.

scholarly journals Combining ability for seed yield, its components and oil content in sunflower (Helianthus annuus L.)

2017 ◽  
Vol 8 (1) ◽  
pp. 96
Author(s):  
A.U. Ingle ◽  
S.S. Nichal ◽  
V.L. Gawande ◽  
E.R. Vaidya ◽  
B.S. Kharat
Keyword(s):  
Helianthus Annuus ◽  
Seed Yield ◽  
Combining Ability ◽  
Oil Content ◽  
Helianthus Annuus L

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.

GENETIC ANALYSIS OF QUANTITATIVE CHARACTERS IN CIGAR AND PIPE TOBACCO NICOTIANA TABACUM. I. MORPHOLOGICAL CHARACTERS

1980 ◽  
Vol 22 (2) ◽  
pp. 173-182 ◽  
Author(s):  
I. S. Ogilvie ◽  
V. Kozumplik
Keyword(s):  
Combining Ability ◽  
Diallel Cross ◽  
Morphological Characters ◽  
General Combining Ability ◽  
Leaf Length ◽  
Specific Combining Ability ◽  
Leaf Angle ◽  
Combining Abilities ◽  
Number Of Leaves ◽  
Pipe Tobacco

A diallel cross of four cigar and one pipe tobacco was analysed for the following characters: (1) height before topping (2) height after topping (3) number of leaves (4) leaf width (5) leaf length (6) leaf angle and (7) days from transplanting to flower. The experiment was performed over three years with four replications. Analysis was done for general combining ability and specific combining ability. General combining ability was in all cases greater than specific combining ability, although there were some specific combining ability effects. The line Pennbel 69 showed very high positive general combining abilities for all characters while the line Petit Havane showed negative general combining abilities for these characters. Commercial production of F1 hybrids would not seem to be of any advantage for any of these characters with these parental lines.

scholarly journals The partial circulant diallel cross at the interpopulation level

1999 ◽  
Vol 22 (2) ◽  
pp. 249-255 ◽  
Author(s):  
José B. Miranda Filho ◽  
Roland Vencovsky
Keyword(s):  
Analysis Of Variance ◽  
Combining Ability ◽  
Diallel Cross ◽  
General Combining Ability ◽  
Coefficient Of Determination ◽  
Alternative Analysis ◽  
The Mean ◽  
The Difference ◽  
Selection Of ◽  
Partial Diallel

The partial circulant diallel cross mating scheme of Kempthorne and Curnow (Biometrics 17: 229-250, 1961) was adapted for the evaluation of genotypes in crosses at the interpopulation level. Considering a random sample of n lines from base population I, and that each line is crossed with s lines from opposite population II, there will be ns sampled crosses that are evaluated experimentally. The means of the ns sampled crosses and the remaining n(n - s) crosses can be predicted by the reduced model <img src="http:/img/fbpe/gmb/v22n2/0291e1.gif" align="absmiddle"> where Yij is the mean of the cross between line i (i = 1,2,...,n) of population I and line j (j = 1',2',...,n') of population II; µ is the general mean, and gi and gj refer to general combining ability effects of lines from populations I and II, respectively. Specific combining ability (Sij) is estimated by the difference <img src="http:/img/fbpe/gmb/v22n2/0291e2.gif" align="absmiddle">. The sequence of crosses for each line (i) is [i x j], [i x (j + 1)], [i x (j + 2)], ..., [i x (j + s -1)], starting with i = j = 1 for convenience. Any j + s -1 > n is reduced by subtracting n. A prediction procedure is suggested by changing gi and gj by the contrasts <img src="http:/img/fbpe/gmb/v22n2/s_ti.gif" alt="s_ti.gif (188 bytes)"> i = <img src="http:/img/fbpe/gmb/v22n2/s_ytra.gif" alt="s_ytra.gif (986 bytes)"> i. - <img src="http:/img/fbpe/gmb/v22n2/s_ytra.gif" align="absmiddle"> .. and <img src="http:/img/fbpe/gmb/v22n2/s_ti.gif" align="absmiddle">j = <img src="http:/img/fbpe/gmb/v22n2/s_ytra.gif" align="absmiddle">.j - <img src="http:/img/fbpe/gmb/v22n2/s_ytra.gif" align="absmiddle">..; the correlation coefficient (r) was used to compare the efficiency of <img src="http:/img/fbpe/gmb/v22n2/s_gtil.gif" align="absmiddle">'s and <img src="http:/img/fbpe/gmb/v22n2/s_tiac.gif" align="absmiddle">'s for selection of lines and crosses. The analysis of variance is performed with the complete model Yij = µ + gi + gj + sij + <img src="http:/img/fbpe/gmb/v22n2/s_e_.gif" align="absmiddle">ij, and the sum of squares due to general combining ability is considered for each population separately. An alternative analysis of variance is proposed for estimation of the variance components at the interpopulation level. An analysis of ear length of maize in a partial diallel cross with n = 10 and s = 3 was used for illustration. For the 30 interpopulation crosses analyzed the coefficient of determination (R2), involving observed and estimated hybrid means, was high for the reduced (g) model [R2 (<img src="http:/img/fbpe/gmb/v22n2/s_yac.gif" align="absmiddle">ij, Yij) = 0.960] and smaller for the simplified (<img src="http:/img/fbpe/gmb/v22n2/s_ti.gif" align="absmiddle">) model [R2 (<img src="http:/img/fbpe/gmb/v22n2/s_yac.gif" align="absmiddle">ij, Yij) = 0.889]. Results indicated that the proposed procedure may furnish reliable estimates of means of hybrids not available in the partial diallel.

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