scholarly journals Effects of total and variances specific combining ability of hemp inbred lines and varieties in topcross systems

1970 ◽  
Vol 21 ◽  
pp. 62-67
Author(s):  
S. V. Mishchenko
Keyword(s):  
Combining Ability ◽  
Cannabis Sativa ◽  
Inbred Lines ◽  
Specific Combining Ability ◽  
Gene Effects ◽  
Study Methods ◽  
Additive Gene Effects ◽  
Additive Gene

Aim. Determination of combining ability of monoecious hemp (Cannabis sativa L.) inbred lines and varieties by quantitative breeding signs of plants are the aims of our study. Methods. The study was conducted in 2014–2016 in the Institute of Bast Crops of NAAS. The effects of total combining ability and specific combining ability variances investigated in the full topcross systems by the method P.P. Lytun and N.V. Proskurnyn (1992). Results. Inbred lines and varieties of hemp were significantly differentiated by the total combining ability effects and specific combining ability variances. Conclusions. Line×variety crossing Central-Russian eco-geographical type and Southern eco-geographical type of hemp was recommended for productive combination breeding. Keywords: hemp, variety, topcross, total combining ability and specific combining ability, additive gene effects and non-additive gene effects.

scholarly journals Combining Ability of Quality Protein Maize Inbred Lines for Yield and Morpho-Agronomic Traits under Optimum as Well as Combined Drought and Heat-Stressed Conditions

Agronomy ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 184 ◽  
Author(s):  
Nyasha E. Chiuta ◽  
Charles S. Mutengwa
Keyword(s):  
Heat Stress ◽  
Combining Ability ◽  
Agronomic Traits ◽  
Inbred Lines ◽  
Sub Saharan Africa ◽  
Optimum Conditions ◽  
Gene Effects ◽  
Additive Gene Effects ◽  
Additive Gene ◽  
Drought And Heat Stress

Drought and heat stress have perceptibly become major maize (Zea mays L.) yield reducing factors in Sub-Saharan Africa. As such, the objectives of this study were to: (i) determine the type of gene action conditioning tolerance to combined drought and heat stress (CDHS), and (ii) identify inbred lines with good combining ability for yield and other morpho-agronomic traits under CDHS. Twenty-four single cross hybrids (SCHs) obtained from crossing 10 inbred lines in a 4 × 6 North Carolina Design II, and a drought-tolerant check, were evaluated under CDHS and optimum conditions in the field. The experiment was laid out in a 5 × 5 alpha lattice incomplete block design, replicated three times. Additive gene effects influenced all the traits under CDHS except grain yield, which was influenced by non-additive gene effects. A preponderance of additive genetic effects was observed for all traits recorded under optimum conditions. Inbred lines L30, L6, L5, L17 and L2 showed good combining ability for yield under CDHS, indicating that they could be good parental lines in hybridization programs. Based on the results, SCHs L2*30, L6*13 and L5*18 exhibited high specific combining ability (SCA) effects for yield under CDHS. These hybrids are recommended for further multi-locational evaluation to determine the stability of their performance.

scholarly journals Popping volume and grain yield in diallel set of popcorn inbred lines

Genetika ◽  
2008 ◽  
Vol 40 (3) ◽  
pp. 249-260 ◽  
Author(s):  
Zorica Pajic ◽  
Uros Eric ◽  
Jelena Srdic ◽  
Snezana Mladenovic-Drinic ◽  
Milomir Filipovic
Keyword(s):  
Grain Yield ◽  
Analysis Of Variance ◽  
Combining Ability ◽  
Inbred Lines ◽  
Gene Effects ◽  
Additive Gene Effects ◽  
Satisfactory Yield ◽  
Genetic Components ◽  
Additive Gene ◽  
Superior Genotypes

Popping volume and yield are traits caused by several heredity factors. It is difficult to obtain superior genotypes for both traits but it is possible to develop genotypes with good popping volume and satisfactory yield. The hybrid ZPPL2 x ZPPL5 was superior in yield, heterosis and SCA for both yield and popping volume. As inbred ZPPL4 in all combinations has a good value for popping volume could be concluded that this inbred may be used as parent in further crosses. Analysis of variance of the combining ability indicating significant SCA effect for grain yield, and significant both GCA and SCA effects for popping volume. Therefore it can be stated that yield is influenced by non-additive and popping volume by both additive and non- additive gene effects. Analysis of variance of genetic components for popping volume indicates that the additive as well as dominant components significantly affected the inheritance of this trait in popcorn. The objective of this study was to evaluate heteorsis and combing ability for grain yield and popping volume in dialalel set of six maize inbred lines.

scholarly journals Combining ability of carrot (Daucus carota L.) lines and heritability of yield and its quality components

2012 ◽  
Vol 24 (2) ◽  
pp. 115-122 ◽  
Author(s):  
Barbara Jagosz
Keyword(s):  
Combining Ability ◽  
Environmental Influence ◽  
Inbred Lines ◽  
Matter Content ◽  
Experimental Plant ◽  
Dry Matter Content ◽  
Gene Effects ◽  
Daucus Carota L ◽  
Additive Gene Effects ◽  
Additive Gene

Abstract The purpose of this research was to investigate the combining ability of inbred lines in terms of traits important for the development of hybrid carrot cultivars with high yields and better root quality. The experimental plant material consisted of 15 inbred lines that were crossed in an incomplete diallel design to produce 34 hybrids. It was observed that the variation of general combining ability (GCA), specific combining ability (SCA) and reciprocal effects (RE) were significant for all of the tested characters, except SCA for sugars. Among the tested lines, the RFO had the most positive GCA for the yield; at the some time, the RFO line had negative GCA for carotenes and dry matter content. A significant positive GCA was found for all traits, except monosaccharides and nitrates, for the 2163 line. Most of the crosses based on the RFO and 2163 lines yielded well; additionally, the hybrids based on 2163 presented high levels of quality characters. The ratio of GCA:SCA indicated that the quality traits were mainly affected by additive gene effects, but the yield was controlled more by non-additive gene effects. Heritability in a broad sense presented a higher environmental influence for yield than the quality characters of carrot roots.

Combining Ability Estimates in Heat Tolerant Tomato (Solanum lycopersicum L.) Genotypes

2010 ◽  
pp. 113-120
Author(s):  
S Ahmad ◽  
AKM Quamruzzaman ◽  
M Nazim Uddin
Keyword(s):  
Combining Ability ◽  
Agricultural Research ◽  
Relative Magnitude ◽  
Fruit Weight ◽  
Research Centre ◽  
Gene Effects ◽  
Additive Gene Effects ◽  
Component Traits ◽  
Additive Gene ◽  
Tomato Genotype

The experiment was conducted at the experimental farm of Olericulture Division, Horticulture Research Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur from May to August 2003. Combining ability effects were estimated for yield and component traits in a 8 x 8 diallel design excluding reciprocals in tomato. The variances for general combining ability (GCA) and specific combining ability (SCA) were highly significant indicating the presence of additive as well as non-additive gene effects in the traits studied. The relative magnitude of these variances indicated that additive gene effects were more prominent for all the characters under study. The tomato genotype P1 (TM051) proved to be the best general combiner for yield followed by P2 (TM053) and the combinations P1xP3, P1xP5 and P5xP7 were identified as the best specific combiner for earliness, yield per plant, number of fruits per plant and individual fruit weight.

Combining ability and heterosis studyin maize inbreds throughout diallel mating design

2018 ◽  
Vol 43 (4) ◽  
pp. 599-609
Author(s):  
ANMS Karim ◽  
S Ahmed ◽  
AH Akhi ◽  
MZA Talukder ◽  
A Karim
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Combining Ability ◽  
Gene Action ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Gene Effects ◽  
Additive Type ◽  
Additive Gene ◽  
Ear Height

Combining ability effects were estimated for grain yield and some other important agronomic traits of maize in a 7×7 diallel analysis excluding reciprocals. The variances for general combining ability (GCA) were found significant for yield, days to pollen shedding, days to silking and ear height while it was found non-significant for plant height and number of kernels/ear. Non-significant general combining ability (GCA) variance for plant height and number of kernels/ear indicates that these two traits were predominantly controlled by non- additive type of gene action. Specific combining ability (SCA) was significant for all the characters except yield and days to silking. Non-significant specific combining ability (SCA) variance for yield and days to silking suggests that these two traits were predominantly controlled by additive type of gene action. Both GCA and SCA variances were found significant only in days to pollen shedding and ear height indicated the presence of additive as well as non additive gene effects for controlling the traits. However, relative magnitude of these variances indicated that additive gene effects were more prominent for all the characters studied except days to silking. Parent BIL95 was the best general combiner for both high yield and number of kernels/ear and parent BML4 for dwarf plant type. Two crosses (BML4× BML36 and BIL114× BIL31) exhibited significant and positive SCA effects for grain yield involved low × average and average × average general combining parents. The range of heterosis expressed by different crosses for grain yield and days to silking was from -65.83 to 21.26 percent and -17.85 to 8.22 percent, respectively.. The better performing three crosses (BIL114×BIL31, BIL138×BIL95 and BIL31×BIL95) can be utilized for developing high yielding hybrid varieties as well as for exploiting hybrid vigour.Bangladesh J. Agril. Res. 43(4): 599-609, December 2018

scholarly journals Combining capacity and heterosis in eggplant hybrids under high temperatures

2019 ◽  
Vol 37 (3) ◽  
pp. 348-353
Author(s):  
Ricardo de N Valadares ◽  
Danieli A Nóbrega ◽  
Lilian B de Lima ◽  
Jordana Antônia dos S Silva ◽  
Ana Maria M dos Santos ◽  
...  
Keyword(s):  
High Temperatures ◽  
Combining Ability ◽  
Phenotypic Variability ◽  
Pollen Viability ◽  
Fixation Index ◽  
Gene Effects ◽  
F1 Hybrid ◽  
Fruit Length ◽  
Additive Gene Effects ◽  
Additive Gene

ABSTRACT The objective of this work was to estimate the combinatorial capacity and heterosis of eggplant hybrids under high temperature conditions. Seven genitors, twelve hybrid combinations, originated from a partial diallel, and the Ciça F1 hybrid, as control, were evaluated. The experiment was conducted under greenhouse conditions in randomized block design with four replications, from April to December 2017. The assessed traits related to high temperatures were pollen viability (PV) and fruit fixation index (FFI); the morphoagronomic traits were number of fruits per plant (NFP), fruit weight (FWe), production per plant (PP), fruit length (FL), fruit width (FWi), fruit length/width ratio (FLWR) and plant height (PH). The variance analysis showed greater participation of the additive gene effects in relation to the non-additive gene effects in most traits, except for PV. The genitors CNPH 141, CNPH 135, CNPH 109 and CNPH 51 stood out with favorable gene effects to obtain genotypes tolerant to high temperatures, since they present good general combining ability (GCA) for the traits FFI, NFP and PP. The 1x4 and 3x4 hybrids presented positive estimates for both GCA and specific combining ability (SCA), demonstrating a greater potential to be used in breeding to increase the FFI, NFP and PP, under high temperatures. The 1x4, 1x5 and 1x6 hybrids expressed positive heterosis for most analyzed traits. The 1x4 hybrid stood out for the highest averages for PV, FFI, NFP and PP. For FWe, FL, FWi and FLWR, both positive and negative heterosis were observed, as consequence of the phenotypic variability of the genitors for these traits and suggests the possibility of selection for different sizes and formats.

scholarly journals Combining Ability Analysis of Maize Inbred Lines in Ethiopia

2020 ◽  
Vol 7 (2) ◽  
pp. 113-124
Author(s):  
Abenezer Abebe Tefera ◽  
Legesse Wolde Beyene ◽  
Wosene Gebreselassie Abtew
Keyword(s):  
Analysis Of Variance ◽  
Combining Ability ◽  
Genetic Material ◽  
Inbred Lines ◽  
Gene Effects ◽  
Lattice Design ◽  
Maize Inbred Lines ◽  
Combining Ability Analysis ◽  
Additive Gene ◽  
Proportional Contribution

The study was initiated to estimate combining ability of maize inbred lines and crosses using line by tester analysis. Fifty entries consists 48 F1 single crosses developed from 24 inbred lines and 2 testers using line x tester design and two commercial check hybrids used in the study. The experiment was conducted using alpha lattice design with two replications. Analysis of variance revealed existence of significant genetic variation among genotypes for all studied traits except for plant aspect (PA). Location x entry interaction for most of the traits was not significant which suggests hybrid performance was consistent across tested locations. Line x tester analysis of variance showed that mean squares due to GCA of lines were significant (p< 0.01 or p< 0.05) for all studied traits. Mean squares of tester GCA and SCA were significant for most of studied traits. This indicates that both additive and non-additive gene effects had contributed for the variation of the crosses. However, higher proportional contribution of additive gene action for all studied traits was obtained. Several lines and crosses were identified as good general and specific combiners for yield and yield related traits. Lines L23, L11, L15 and crosses L2xT1, L3xT1, L8xT1, L11xT1, L23xT1 and L13xT2 were found to be good general and specific combiners, respectively. In conclusion, the stated inbred lines with desirable gca effects and cross combinations with desirable sca effects for grain yield and yield related traits could be used as useful genetic material.

scholarly journals Analysis of Combining Ability in Rice Varieties for Quantitative Traits

2019 ◽  
Vol 11 (3) ◽  
pp. 436-439
Author(s):  
Ghaffar KIANI
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Agronomic Traits ◽  
Block Design ◽  
Rice Varieties ◽  
Gene Effects ◽  
Breeding Programs ◽  
Grain Length ◽  
Additive Gene Effects ◽  
Additive Gene

Rice is staple food in Iran. Despite of high quality of local rice, their grain yield is low. In hybridization breeding programs, selection of suitable parents is an essential role for developing new combinations with broadens genetic diversity. Combining ability of local rice varieties namely ‘Hashemi’, ‘Sang Jo’ and ‘Tarom Deylamani’ and ‘Nemat’ was evaluated in a partial diallele analysis for agronomic traits in a randomized complete block design at Sari Agricultural Sciences and Natural Resources University. General combining ability (GCA) and specific combining ability (SCA) variances showed predominated role of additive gene effects in the inheritance of grain length. Both additive and non-additive components of genetic variances were important in the inheritance of traits like grain yield, plant height, panicle length, total grains per panicle, grain length and grain length to width. However, non-additive gene effects were seen for tiller number. Results showed that ‘Nemat’ was the best general combiner for most of characters followed by ‘Tarom Deylamani’. The cross of ‘Hashemi’ × ‘Tarom Deylamani’ was suggested to exploitation of heterosis breeding for increasing yield and its components in rice breeding programs. 

scholarly journals Combining Ability Analysis of Heat Tolerance in Gossypium hirsutum L.

2011 ◽  
Vol 41 (No. 1) ◽  
pp. 23-28 ◽  
Author(s):  
T. Azhar M ◽  
A. Khan A ◽  
A. Khan I
Keyword(s):  
Gossypium Hirsutum ◽  
Heat Tolerance ◽  
Combining Ability ◽  
Specific Combining Ability ◽  
Gossypium Hirsutum L ◽  
Gene Effects ◽  
Combining Ability Analysis ◽  
Additive Gene ◽  
Significant Comparison ◽  
Efficient Transfer

In order to study the genetic control of heat tolerance, four varieties/lines of Gossypium hirsutum L., namely MNH-554, Cocker-304, Delcerro and Albacala (71) 1190, were crossed in all possible combinations. Heat tolerance of 12 hybrids and their parents was measured at reproductive phase using an electrolyte leakage technique. The genetic analysis of the data showed significant effects of specific combining ability and reciprocals, but the effect of general combining ability appeared to be non-significant. Comparison of the parents for heat tolerance revealed that Delcerro and MNH-554 were the best general combiners for the character. The crosses Cocker-304 &times; Delcerro and Albacala (71) 1190 &times; MNH-554 were determined as the best combinations for heat tolerance and they involved one good general combiner as a parent. Significant effects due to specific combining ability indicated the importance of non-additive gene effects controlling heat tolerance. This information suggests that development of heat tolerance in the present plant material may be difficult; therefore it is necessary to design a specific breeding programme for efficient transfer of the trait. &nbsp;

scholarly journals COMBINING ABILITY IN RELATION TO HETEROSIS EFFECTS AND GENETIC DIVERSITY IN COTTON USING LINE X TESTER MATING DESIGN

2021 ◽  
Vol 21 (No.1) ◽  
Author(s):  
Max Mariz ◽  
Reham Gibely ◽  
Abdelmoghny AM
Keyword(s):  
Genetic Diversity ◽  
Combining Ability ◽  
Gene Action ◽  
Fiber Strength ◽  
Fiber Quality ◽  
Block Design ◽  
Specific Combining Ability ◽  
Lint Yield ◽  
Gene Effects ◽  
Additive Gene

The aim of this study was to investigate the relationship between specific combining ability, genetic diversity of parents and heterosis over better parent effects. This research, having eighteen F1 crosses derived from crossing between six lines and three testers, was conducted in order to estimate combining ability, to determine the nature of gene action and heterosis for yield and fiber quality traits and to detect the appropriate crosses for cotton breeding program. The experiment was conducted on randomized complete block design with three replications. The analyses of variance showed significant differences among the genotypes, parents (lines and testers) and crosses for all the studied traits. Estimates of both general and specific combining ability effects were significant for most traits, indicating the importance of both additive and non-additive gene effects for these traits. While, specific was higher than general combining ability variances, for all traits, showing non-additive gene action controlling and therefore, heterosis breeding may be rewarding. The heterosis value varied from cross to cross and from trait to trait. This dissimilarity coefficient was ranged from 3.234 between Giza 85 and Giza 80 to 71.002 between Giza 96 and 10229. Association between heterosis over better parent and specific combining ability was positive and significant for all the studied traits except lint yield / plant. No correlations were found between SCA and GD for all the studied traits. Similarly, heterosis effects was negatively significantly correlated with GD only in the case of boll weight, lint yield / plant and uniformity ratio %, while showed positive and significant correlation for fiber strength and micronaire value. Four crosses showed both positive and significant heterosis and specific combining ability for most yield traits. The parents of these crosses belong to different clusters. Crossing diverse parents could produce high heterotic performance in hybri

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