scholarly journals Genetic Analysis by Using Partial Diallel Crossing of Maize In High Plant Densities (Estimation GCA, SCA and Some Genetic Parameters)

2021 ◽  
Vol 910 (1) ◽  
pp. 012135
Author(s):  
Adeeb Jameel Amanah ◽  
Banan Hassan Hadi
Keyword(s):  
Inbred Line ◽  
Combining Ability ◽  
Genetic Parameters ◽  
Inbred Lines ◽  
Low Density ◽  
General Ability ◽  
Engineering Sciences ◽  
Diallel Crossing ◽  
Plant Densities ◽  
Partial Diallel

Abstract The experiment was carried out at the Field Crops Research Station, College of Agricultural Engineering Sciences - University of Baghdad in Jadiriyah, with the aim of evaluating the performance of partial diallel hybrids and inbred lines of maize and estimating general combining ability(GCA), specific combining ability (SCA) and some genetic parameters. The experiment was carried out in two seasons, spring and fall 2020. Eight inbred lines of maize were used in the study (BI9/834, BSW18, LW/5 L8/844, ZA17W194, Z117W, ZI17W9, ZI7W4), numbered (1,2,3,4,5,6,7,8), It was sowed in the spring season and entered into a cross-program according to a partial diallel crossing system to obtain twelve partially cross-hybrids, and it was compared with its eight parents in a comparison experiment in the fall season using a Randomized Complete Block Design (RCBD) with split plots arrangement with three replication. The plant densities of 70 and 90 thousand plants ha-1 represented the main plots, while the partial diallel hybrids and their parents represented the secondary plots. The results of the study showed that the ratio between GCA and SCA) GCA/SCA) It was more than 1 for yield traits, ear length, number of rows and number of row grains in both low and high densities, which indicates the control of the additive genetic action on these traits. While the ratio was less than one for the traits of the ear diameter under the low density, which indicates the control of dominance genes on this trait in the mentioned density, while the trait of the number of ear grains, the ratio between the general and specific combining abilities was less than one in the high density. Inbred line 8 had the highest effect for the general ability to combine under low density, which amounted to 11.075, while inbred line 2 was superior by giving the highest effect to the general ability to combine at low density, which amounted to 17.80, followed by inbred 8.

scholarly journals Iodent Germplasm Source Material Selection in Development of Maize Hybrids for the Steppe Zone of Ukraine

2020 ◽  
Vol 10 (1) ◽  
pp. 76-84
Author(s):  
B. V. Dziubetskyi ◽  
V. Yu. Cherchel ◽  
O. V. Abelmasov ◽  
V. V. Semenova ◽  
M. M. Tagantsova
Keyword(s):  
Grain Yield ◽  
Inbred Line ◽  
Combining Ability ◽  
Material Selection ◽  
Steppe Zone ◽  
Inbred Lines ◽  
Genetic Distances ◽  
Source Material ◽  
Breeding Cycle ◽  
Early Maturity

The aim of the study: Evaluation of sister hybrids obtained on the basis of early maturity Iodent germplasm inbred lines (FAO 180-250) as a source material for the development of new inbred lines and evaluation of this material’s main breeding qualities as well as of level of hypothetical heterosis in sister crosses and their polymorphism as an integral part of the breeding cycle. Methods: Field method, mathematical-statistical method. Results: The studies investigated sister hybrids obtained by crossing of 8 precocious Iodent germplasm inbred lines, their combining ability for “grain yield” trait and determined whether they can be used as a source material for the synthesis of new homozygous inbred lines. The results of the evaluation of sister hybrids and their testcrosses on the basic economically valuable traits are presented. According to research results in 2013-2015, it was found that sister hybrids with the least variable grain yields by years of research were obtained from the crossing of DK1274 and DK237 inbred lines. The calculations of the correlation coefficients between hypothetical heterosis and genetic distances revealed no significant correlation between them (r=0.118-0.359) as well as between the yield of sister hybrids and genetic distances (r=0.167-0.351). It was found that the least variable indicators of grain yield for the years of research were noted in sister hybrids obtained on the basis of source inbred lines with the most stable manifestation of this indicator (r=0.714). Sister hybrids were noted, which had effects of general combining ability at class 2, regardless of study conditions (DK216 × DK213, DK237 × DK1274, DK714/195 × DK216), indicating the stability of genotype response to growing conditions. Conclusion: The evaluation of 8 precocious constant Iodent germplasm inbred lines on breeding traits revealed the best of them (DK555 and DK1274) in combining ability compared to the DK744 control inbred line. Significant influence of the conditions of research years on all the traits studied was noted. The study of sister hybrids has revealed forms with a significant manifestation of hypothetical heterosis. It was the highest on average in crosses of inbred lines DK234 (137.0%), DK714/195 (122.7%) and DK216 (101.1%), and the smallest in hybrids with inbred lines DK555 (58.5%), DK1274 (65.8%) and DK744 (75.0%). Sister combinations with DK1274 and DK237 inbred lines were characterized by the highest yield stability over the years of study. In determining genetic distances, the most genetically similar inbred lines DK744 (0.136) and DK234 (0.197) to inbred line 207 (P165), which is the classic representative of the Iodent germplasm, are noted.

scholarly journals PENDUGAAN PARAMETER GENETIK PADA PERSILANGAN DIALEL BEBERAPA TETUA CABAI (Capsicum annuum L.)

2015 ◽  
Vol 24 (1) ◽  
pp. 1
Author(s):  
Sri Romaito Dalimunthe
Keyword(s):  
Combining Ability ◽  
Block Design ◽  
Diallel Analysis ◽  
Inbred Lines ◽  
Fruit Weight ◽  
High Genetic Diversity ◽  
Diallel Crossing ◽  
Recessive Genes ◽  
High Heritability ◽  
Materials Used

High genetic diversity in chili is the basis for a chili breeding program. One of the methods to increase diversity is through crossing. There are several crossing designs in order to produce new varieties, such as diallel crossing. Diallel analysis is a method for studying the inheritance of characteristics from various crossings. The aim of this research was to estimate the genetic parameters, the general combining ability (GCA) and specific combining ability (SCA) of six inbred lines of chili. The research was conducted in November 2008-May 2009 at the Experimental Farm Leuwikopo IPB. Genetic materials used were six inbred lines of chili (IPB C2, IPB C9, IPB C10, IPB C14, IPB C15 and IPB C20) and the F1s of the combination of six inbred lines. The experimental design was Randomized Complete Block Design with a single factor, namely genotype. The number of genotypes were 36 with three replications, so there were 108 units of experiment. The crossing design used was diallel crossing design. The results showed that there were no interaction between genes on the dichotomous height and fruit weight, significant additive effects, the control genes spread unevenly, and relatively high heritability values. Genotype which carried recessive genes the most was IPB C14 and genotype which carried the most dominant genes was IPB C10. IPB C10 showed the highest GCA for dichotomous height and IPB C2 showed the highest GCA on fruit weight. The crossing between IPB C2 x IPB C10 showed the highest SCA for dichotomous height. For fruit weight, crossing of IPB C2x IPB C14 had the highest SCA. Crossing combination of IPB C2 x IPB C14 was the best hybrid.

Expected efficiencies of mating designs for reselection of parents

1990 ◽  
Vol 20 (10) ◽  
pp. 1664-1671 ◽  
Author(s):  
R. D. Burdon ◽  
J. P. van Buijtenen
Keyword(s):  
Genetic Gain ◽  
Combining Ability ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Separate Study ◽  
Maximal Efficiency ◽  
Diallel Crossing ◽  
Half Diallel ◽  
Advanced Generation ◽  
Partial Diallel

Expected efficiencies, in terms of genetic gain from reselection of parents (backwards selection), were compared for hierarchical mating, factorial, partial factorial, modified half diallel, and partial diallel crossing designs and polycrosses; this was done in parallel with a separate study of expected efficiencies for advanced-generation (forwards) selection, assuming a fixed-resources model of 100 parents and 10 000 offspring. The present study considered a single-trait case, with variable numbers of crosses per parent, varying heritability (h2) levels (h2 = 0.1, 0.2, and 0.5), and varying ratios of specific combining ability to general combining ability variance (0, 0.5, and 1). Compared with the case of forwards selection, the relative efficiencies of the different designs were generally similar. Two notable exceptions were the comparative inefficiency of small, disconnected factorial sets for backwards selection and the generally high (but not always maximal) efficiency of polycrosses for this purpose.

scholarly journals Genetic Diversity and Combining Ability of White Maize Inbred Lines under Different Plant Densities

Plants ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1140 ◽  
Author(s):  
Mohamed M. Kamara ◽  
Medhat Rehan ◽  
Khaled M. Ibrahim ◽  
Abdullah S. Alsohim ◽  
Mohsen M. Elsharkawy ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Grain Yield ◽  
Genetic Distance ◽  
Combining Ability ◽  
Plant Density ◽  
Inbred Lines ◽  
Hybrid Performance ◽  
High Plant Density ◽  
Plant Densities ◽  
Additive Gene

Knowledge of combining ability and genetic diversity are important prerequisites for the development of outstanding hybrids that are tolerant to high plant density. This work was carried out to assess general combining ability (GCA) and specific combining ability (SCA), identify promising hybrids, estimate genetic diversity among the inbred lines and correlate genetic distance to hybrid performance and SCA across different plant densities. A total of 28 F1 hybrids obtained by crossing eight adverse inbred lines (four local and four exotic) were evaluated under three plant densities 59,500 (D1), 71,400 (D2) and 83,300 (D3) plants ha−1 using spilt plot design with three replications at two locations during 2018 season. Increasing plant density from D1 to D3 significantly decreased leaf angle (LANG), chlorophyll content (CHLC), all ear characteristics and grain yield per plant (GYPP). Contrarily, days to silking (DTS), anthesis–silking interval (ASI), plant height (PLHT), ear height (EHT), and grain yield per hectare (GYPH) were significantly increased. Both additive and non-additive gene actions were involved in the inheritance of all the evaluated traits, but additive gene action was predominant for most traits. Inbred lines L1, L2, and L5 were the best general combiners for increasing grain yield and other desirable traits across research environments. Two hybrids L2 × L5 and L2 × L8 were found to be good specific combiners for ASI, LANG, GYPP and GYPH. Furthermore, these hybrids are ideal for further testing and promotion for commercialization under high plant density. Genetic distance (GD) among pairs of inbred lines ranged from 0.31 to 0.78, with an average of 0.61. Clustering based on molecular GD has effectively grouped the inbred lines according to their origin. No significant correlation was found between GD and both hybrid performance and SCA for grain yield and other traits and proved to be of no predictive value. Nevertheless, SCA could be used to predict the hybrid performance across all plant densities. Overall, this work presents useful information regarding the inheritance of maize grain yield and other important traits under high plant density.

scholarly journals Implementation of partial diallel analysis to determine general combining ability and agronomic character genetic parameters of shade-tolerant maize lines

2021 ◽  
Vol 911 (1) ◽  
pp. 012019
Author(s):  
Roy Efendi ◽  
Muhammad Azrai
Keyword(s):  
Combining Ability ◽  
Genetic Parameters ◽  
Block Design ◽  
Diallel Analysis ◽  
General Combining Ability ◽  
Leaf Length ◽  
General Ability ◽  
Randomized Block Design ◽  
High Heritability ◽  
Ear Height

Abstract Information about combining ability and genetic parameters guide maize breeders in selecting parents and gene action of the desired trait. This study aims to determine the general combining ability of the yield characters of shading tolerant maize lines and the genetic parameters of their agronomic characters. This research was conducted at IP2TP Bajeng in December 2020-March 2021. The study was arranged in a randomized block design with three replications. The genotypes used were nine hybrids obtain from a partial diallelic (2x6). The results showed that line SHD3 showed good general ability for yield. High heritability values were shown by variables days to anthesis, days to silk, plant height, ear height, leaf length, leaf width, 100 grains weight and ear diameter.

Genetic Control of Rooting Ability of Stem Cuttings in Eucalyptus nitens

1997 ◽  
Vol 45 (1) ◽  
pp. 203 ◽  
Author(s):  
Wayne N. Tibbits ◽  
Timothy L. White ◽  
Gary R. Hodge ◽  
Kelsey R. Joyce
Keyword(s):  
Genetic Control ◽  
Combining Ability ◽  
Genetic Parameters ◽  
Family Interaction ◽  
Specific Combining Ability ◽  
Stem Cuttings ◽  
Eucalyptus Nitens ◽  
Individual Tree ◽  
Rooting Ability ◽  
Partial Diallel

Genetic parameters for rooting of stem cuttings inEucalyptus nitens (Deane & Maiden) Maiden wereestimated from almost 600 control-pollinated seedlings grown in pots in anenvironmentally controlled glasshouse. Multiple harvests spanning a 9 monthperiod were taken from the 67 families arising from a partial diallel matingdesign among 25 unrelated parents. Overall, of the 14205 cuttings that wereset, only 14% initiated roots. There was little if any biologicallyimportant harvest-by-family interaction for rooting. Individual tree narrowsense heritability (h2) was highat 0.4–0.5. The ratio of specific combining ability variance to generalcombining ability variance was low. The operational implications forincorporating this trait into a breeding program are discussed.

CG104 and CG105 corn inbred line

2000 ◽  
Vol 80 (3) ◽  
pp. 599-600 ◽  
Author(s):  
E. A. Lee ◽  
B. Good ◽  
R. Chakravarty ◽  
L. Kannenberg
Keyword(s):  
Zea Mays ◽  
Key Words ◽  
Inbred Line ◽  
Combining Ability ◽  
Zea Mays L ◽  
Inbred Lines ◽  
Lodging Resistance ◽  
Cultivar Description ◽  
Corn Inbred

CG104 and CG105 are short seasoned corn (Zea mays L.) inbred lines. Both exhibit excellent combining ability and average to superior lodging resistance in hybrids. Key words: Corn, Zea mays L., cultivar description

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