scholarly journals Combining Ability Analysis of N2-Fixation and Related Traits in Peanut1

1985 ◽  
Vol 12 (2) ◽  
pp. 55-57 ◽  
Author(s):  
S. N Nigam ◽  
S. L Dwivedi ◽  
P. T. C Nambiar ◽  
R. W Gibbons ◽  
P. J Dart
Keyword(s):  
Total Nitrogen ◽  
Combining Ability ◽  
Nitrogenase Activity ◽  
Additive Genetic Variance ◽  
Diallel Cross ◽  
Root Weight ◽  
Breeding Programs ◽  
Arachis Hypogaea L ◽  
Combining Ability Analysis ◽  
Low Nitrogen

Abstract Analysis of a six parent diallel cross involving high and low nitrogen fixing peanut (Arachis hypogaea L.) genotypes revealed the predominant nature of non-additive genetic variance for nitrogenase activity and other traits. Germplasm line, NC Ac 2821 had the highest general combining ability for nitrogenase activity, total nitrogen, leaf area, and top weight, and therefore, it should be a good parent for use in breeding programs. Nitrogenase activity was significantly and positively correlated with nodule number, nodule mass, total nitrogen, top weight, and root weight. This evidence suggests the possibility of breeding for increased nitrogen fixation and thus yield in peanut.

scholarly journals Heterosis and combining ability for grain yield and its contributing characters in maize

1970 ◽  
Vol 33 (3) ◽  
pp. 375-379 ◽  
Author(s):  
AKMM Alam ◽  
S Ahmed ◽  
M Begum ◽  
MK Sultan
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Additive Genetic Variance ◽  
Diallel Cross ◽  
Grain Weight ◽  
Combining Ability Analysis ◽  
Days To Maturity ◽  
Additive Gene ◽  
Ear Height ◽  
1000 Grain Weight

Combining ability analysis for grain yield and its contributing characters in maize were carried out in 5×5 diallel cross. The highest percentage of heterosis for grain per ear over mid parent and better parent were observed by the cross P2×P3. Crosses P1×P3 and P1×P5 showed significant negative heterosis for days to maturity. Significant general and specific combining ability variances were observed for all the characters except ear height. Almost equal role of additive and non-additive gene actions was observed for days to maturity. Additive genetic variance was preponderant for grains per ear and 1000-grain weight and non-additive gene action was involved in plant height, ear height, days to silking, and days to maturity. The inbred lines P2 and P5 were found to be best general combiner for 1000-grain weight. Key Words: Heterosis, combining ability, grain yield, maize. doi:10.3329/bjar.v33i3.1596 Bangladesh J. Agril. Res. 33(3) : 375-379, September 2008

Diallel crosses of honeybees. II A note presenting an estimate of the heritability of honey production under Australian conditions

1987 ◽  
Vol 38 (3) ◽  
pp. 651 ◽  
Author(s):  
BP Oldroyd ◽  
C Moran ◽  
FW Nicholas
Keyword(s):  
Weight Gain ◽  
Combining Ability ◽  
Additive Genetic Variance ◽  
Diallel Cross ◽  
Environmental Variance ◽  
Honey Production ◽  
Combining Ability Analysis ◽  
Phenotypic Standard Deviation ◽  
Selection For ◽  
Partial Diallel

A partial diallel cross of honeybees (Apis mellifera L.) was formed. Combining ability analysis of variance was used to estimate additive and non-additive genetic variance in seasonal colony weight gain for the artificial 'population' studied. The values determined were: general combining ability variance, 12.14 kg2 (s.e., 11.42); specific combining ability variance, 11 -96 kg2 (s.e., 13.71); environmental variance, 21.65 kg2 (s.e., 8.84); heritability of honey production, 0.42 (s.e., 0.24). The phenotypic standard deviation was 7.6 kg.The results suggest that selection for colony weight gain would be successful.

scholarly journals Genetic parameters and combining ability of some important traits in rice (Oryza sativa L.)

Genetika ◽  
2017 ◽  
Vol 49 (3) ◽  
pp. 1001-1014 ◽  
Author(s):  
Hasanalideh Haghighi ◽  
Ezatollah Farshadfar ◽  
Mehrzad Allahgholipour
Keyword(s):  
Combining Ability ◽  
Genetic Parameters ◽  
Amylose Content ◽  
Oryza Sativa L ◽  
Block Design ◽  
Regression Line ◽  
Diallel Cross ◽  
Combining Ability Analysis ◽  
Additive Gene ◽  
F2 Generation

In order to study the combining ability, genetic parameters and gene actions of yield, yield components and quality characters in rice, fifteen F2 generation of a 6?6 diallel cross, excluding reciprocals, was grown in a randomized complete block design (RCBD) with three replications. The results of analysis of variance showed significant differences between the genotypes for grain yield (GY), 100-grain weight (HGW), number of panicles per plant (PN), panicle length (PL), number of full grains per panicle (FGN) and for quality characters including amylose content (AC) and gel consistency (GC). The results of combining ability analysis revealed that general combining ability (GCA) and specific combining ability (SCA) were significant for characters GY, FGN, GC, AC, HGW and PN indicating the involvement of additive and non-additive effects in their inheritance, however high amounts of Bakers ratio remarked that additive gene effect had more portion in controlling these traits. The best combiners for GY, HGW, FGN, PN and PL, were RI18447-2, IR 50, Daylamani, RI18430-46 and Daylamani respectively. For AC and GC, the best combiner was Daylamani. Hayman's graphs showed that regression line passed below the origin cutting Wr axis in the negative region for HGW, PN, PL and GC, indicating the presence of over dominance. Estimates of genetic parameters showed significant amount of H1 and H2, and non-significant amount of D for the characters GY, PN, PL and GC, which confirmed the existence of dominance in the inheritance of these traits.

scholarly journals General and specific combining abilities in a lulo diallel cross (Solanum quitoense Lam.)

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
David Duarte-Alvarado ◽  
Tulio César Lagos-Burbano ◽  
Liz K. Lagos-Santander ◽  
Carlos-Andrés Benavides-Cardona
Keyword(s):  
Combining Ability ◽  
Nutritional Value ◽  
Diallel Cross ◽  
Polar Axis ◽  
Fruit Weight ◽  
Cold Climate ◽  
Breeding Programs ◽  
Single Cross ◽  
Improvement Programs ◽  
Flowering Onset

Lulo (Solanum quitoense) is a promising agro-industry fruit tree, not only because of its nutritional value, taste, and appearance but also because it provides an alternative production system in mild and moderately cold climate zones. Lulo crop yield and production in the Department of Nariño (Colombia) has decreased in recent years when compared to other producing regions in Colombia. Therefore, the objective of this study was to estimate the effects of the general combining ability (GCA) and the specific combining ability (SCA) in a diallel cross of 10 promising parents in four growing regions of the Department of Nariño for use in breeding programs. A total of 45 hybrid combinations were obtained and assessed with Griffing method 4. The following variables were assessed: days to flowering onset (DFO), number of clusters per branch (NCB), fruit weight (FW), polar axis (PA) of the fruit, and yield (Y). The analysis of variance showed statistical differences for most variables in response to single-cross hybrid effects and locations, except for NCB and Y. Moreover, significant differences were found for the interactions between the GCA and SCA and the hybrids and locations, respectively, meaning that environment must be considered when selecting parents with specific adaptability. The effects of the GCA and SCA promoted higher positive values for the FW and Y in parents 4, 6, and 8 and their combinations. Therefore, these parental genotypes are promising for lulo genetic improvement programs since their additive effects and genetic dominance favor fruit weight and yield.

Combining ability analysis of groundnut (Arachis hypogaea L.) genotypes for yield and related traits under drought-stressed and non-stressed conditions

Euphytica ◽  
2021 ◽  
Vol 217 (11) ◽  
Author(s):  
Seltene Abady ◽  
Hussein Shimelis ◽  
Pasupuleti Janila ◽  
Dnyaneshwar Deshmukh ◽  
Ankush Wankhade ◽  
...  
Keyword(s):  
Arachis Hypogaea ◽  
Combining Ability ◽  
Arachis Hypogaea L ◽  
Combining Ability Analysis

COMBINING ABILITY ANALYSIS IN THE CULTIVATED STRAWBERRY

1971 ◽  
Vol 51 (5) ◽  
pp. 377-383 ◽  
Author(s):  
L. P. S. SPANGELO ◽  
R. WATKINS ◽  
C. S. HSU ◽  
S. O. FEJER
Keyword(s):  
Combining Ability ◽  
Plant Density ◽  
Diallel Cross ◽  
General Combining Ability ◽  
Flower Stalk ◽  
Combining Abilities ◽  
Combining Ability Analysis ◽  
Strawberry Cultivars

General and specific combining abilities were analyzed for total, marketable, early, and late yield, and for flower stalk number in a diallel cross of eight strawberry cultivars. Data were recorded from individual seedlings restricted to two runner plants, thereby eliminating variability resulting from differences in plant density. General and specific combining abilities for the five characters were highly significant. Estimates of general combining ability effects taken alone were, in general, of little value in predicting the order of desirability of individual crosses.

Quantitative Genetic Aspects of Nitrogen Fixation in Peanuts (Arachis hypogaea L.)1,2

1980 ◽  
Vol 7 (2) ◽  
pp. 101-105 ◽  
Author(s):  
T. G. Isleib ◽  
J. C. Wynne ◽  
G. H. Elkan ◽  
T. J. Schneeweis
Keyword(s):  
Nitrogen Fixation ◽  
Arachis Hypogaea ◽  
Gene Action ◽  
Nitrogenase Activity ◽  
Diallel Cross ◽  
Host Genotype ◽  
Combining Abilities ◽  
Arachis Hypogaea L ◽  
Shoot Weight ◽  
Simple Evaluation

Abstract Manipulation of the host genotype has been proposed as a method of increasing biological nitrogen fixation by rhizobia in symbiosis with the peanut (Arachis hypogaea L.). The F1 generation of a diallel cross of 10 South American cultivars was evaluated in the greenhouse in an analysis of gene action for traits related to nitrogen fixation. The parents represented five secondary centers of diversity and effects in the diallel model were partitioned into among- and within-center components. Variation of center effects was significant for several characters but was smaller in magnitude than within-center variation. Specific combining abilities were significant and accounted for more variability than general combining abilities for nodule number, nodule mass, specific nitrogenase activity, shoot weight, and total nitrogen, indicating non-additive types of gene action. Maternal effects were observed for the same characters. The parents with the highest general combining abilities (GCA's) for nitrogen fixation were both fastigiate types, while Virginia-type parents had generally low GCA's. Correlations between parental and GCA effects were nonsignificant for all traits, so simple evaluation of lines for nitrogen-fixing capacity may not identify superior parents for use in breeding programs.

GENOTYPE × ENVIRONMENT INTERACTIONS IN SMOOTH BROMEGRASS. I. YIELD

1979 ◽  
Vol 21 (1) ◽  
pp. 57-63 ◽  
Author(s):  
Wai-Koon Tan ◽  
Geok-Yong Tan ◽  
P. D. Walton
Keyword(s):  
Genetic Variation ◽  
Analysis Of Variance ◽  
Combining Ability ◽  
Significant Variation ◽  
Diallel Cross ◽  
General Combining Ability ◽  
Bromus Inermis ◽  
Smooth Bromegrass ◽  
Combining Ability Analysis ◽  
Half Diallel

Twenty-one progenies and the parents of a 7 × 7 half diallel cross of smooth bromegrass (Bromus inermis Leyss.) were evaluated at four locations in Alberta in each of two years, for genetic variation and genetic by environment interactions in the expression of their yield potentials. Years, locations and their interactions were highly significant in the combined analysis of variance. Combining ability analysis revealed that general combining ability (GCA) and specific combining ability (SCA) were both important in the expression of yield, including spring, fall and annual yield, whereas GCA was more important than SCA for yield per area. Although the genotype × environment interactions were all highly significant, variation accounted for by combining ability effects was generally higher than the interaction effects of GCA and SCA respectively, with environments. High average GCA effects for spring, fall and annual yield were demonstrated for the clones UA5, UA9 and B42. These together with the high average SCA effects suggested that the three clones could be included in a synthetic to develop high yielding cultivars. The results suggested that recurrent selections involving multi-location and multi-year testing seems necessary in breeding for high yielding bromegrass cultivars in Alberta.

scholarly journals Combining ability analysis in near homozygous lines of okra [Abelmoschus esculentus (L.) Moench] for yield and yield attributing parameters

2017 ◽  
Vol 9 (1) ◽  
pp. 324-331
Author(s):  
Y. A. Lyngdoh ◽  
R. Mulge ◽  
A. Shadap ◽  
Jogendra Singh ◽  
Seema Sangwan
Keyword(s):  
Combining Ability ◽  
Genetic Variance ◽  
Gene Action ◽  
Additive Genetic Variance ◽  
Total Yield ◽  
Fruit Weight ◽  
Additive Gene Action ◽  
Combining Ability Analysis ◽  
Additive Gene ◽  
Number Of Branches

Line × tester analysis was carried out with the objective of identifying the good combiners and to decide the breeding strategies for developing potential and productive genotypes or cultivars. Parents and hybrids differed significantly for GCA and SCA effects for all the characters respectively. Specific combining ability (SCA) variance was higher than the general combining ability (GCA) variance which shows the predominance of non-additive gene action for the improvement of all the characters studied. The parents and crosses having highest and significant GCA and SCA effects viz., KO-18 (13.69), KO-6 (9.54) and KO-2 × Parbhani Kranti (19.28) for plant height; KO-12 (0.34), KO-14 (0.19) and KO-5 × V5 (0.60) for number of branches per plant; KO-14 (-0.66) and KO-15 × Arka Anamika(-1.66) for days to first flowering; KO-1(1.10), Arka Anamika (0.46) and KO-9 × VRO-5 (3.28) for fruit length; KO-7 (7.91), VRO-5(1.68) and KO-18 × VRO-6 (8.64) for average fruit weight; KO-2 (1.18) and KO-17 × Arka Anamika (2.80) for number of fruits per plant; KO-9(0.05), VRO-6 (0.01) and KO-11 × VRO-6 (0.10) for total yield per plant were identified as good general and specific combiners. The results establish the worth of heterosis breeding for effective usage of non-additive genetic variance in okra.

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