scholarly journals Heritability and Genetic Advance as Genetic Indicators for Improvement in Two Cotton Crosses

2021 ◽  
Vol 3 (2) ◽  
Keyword(s):  
Gene Action ◽  
Fiber Quality ◽  
Quality Traits ◽  
Additive Gene Action ◽  
Fiber Quality Traits ◽  
Positive Skewness ◽  
Negative Skewness ◽  
Additive Gene ◽  
Transgressive Segregants ◽  
Egyptian Cotton

The primary breeding goal for the Egyptian cotton breeding program is how to genetically improve both yield and fibre quality traits, while most of these agronomically traits are biometric traits. The objective of the present study is to evaluate variability and estimate frequency of transgressive segregants in order to isolate early superior individual plants which exceeding the better parent for some yield and fiber quality traits in two intraspecific cotton crosses in early transgressive segregating generation (F2 ). The F1 was highly significant superior than the better parent (Giza 97 and Giza 94) of the two crosses for all the studied traits except boll weight and lint %. Most of the studied traits in F2 generation showed high values of broad sense heritability coupled with low GAM % indicated that these traits controlled by non-additive gene action. All the studied traits had positive skewness sign except for lint %. Presley index and uniformity index for the two cotton crosses and upper half mean for cross II showed negative skewness. The negative skewness indicated that the population had more plants frequency with higher mean values than population mean and controlled by dominancy alleles. While, the traits that had positive skewness are controlled by additive gene action. The two cotton crosses showed transgressive segregants for all the studied traits. Cross I has higher transgressive index for yield traits than cross II, while cross II has the same trend for fiber quality traits than cross I. These results indicated that the both parents of the two cotton crosses had different alleles and genes governing the respective studied traits, which will help cotton breeder to combine beneficial alleles into a single genotype by rigorous selection process. This strategy could be used to improve many economic biometric traits by using better and stringent selection procedure to enhance Egyptian cotton productivity which is major concern in Egypt. The breeder can use transgressive segregation as an indicator of genetic variability to select the most superior plants.

scholarly journals Assessment of Combining Ability Effects for several Yield and Quality Traits in a Complete Diallel Cross of Strawberry (Fragaria × ananassa Duch.)

2017 ◽  
Vol 45 (2) ◽  
pp. 517-524
Author(s):  
Sorin CIULCA ◽  
Natalia CARP ◽  
Emilian MADOŞA ◽  
Adriana CIULCA ◽  
Radu ŞUMĂLAN
Keyword(s):  
Combining Ability ◽  
Gene Action ◽  
Sugar Content ◽  
Fruit Weight ◽  
Yield Traits ◽  
Quality Traits ◽  
Additive Gene Action ◽  
Plant Yield ◽  
Yield And Quality ◽  
Additive Gene

Information on the inheritance of yield and quality traits is important for the selection of parents and breeding approaches to be adopted for the improvement of strawberry. The present study aimed to estimate the combining ability and gene effects for plant yield, fruits number/plant, fruit weight, pulp firmness and sugar content of strawberries in order to identify the best genitors and promising crosses, in 30 hybrids of six parents. The additive and non-additive gene action as well as the maternal effects was involved in the inheritance of the studied traits. For all traits, especially for fruit weight and plant yield, the additive gene action was more important than the non-additive one. The parents ‘A1’ and ‘Alba’ showed a higher concentration of favourable alleles for plant yield and fruits number, and they will allow the increase of plant yield when used as a donor of pollen and the increase of fruit number when used as a recipient of pollen. The variety ‘Marmolada’ was a good general combiner for sugar content, pulp firmness and fruit weight, especially when used as a female genitor. These parents could be used in hybridization in order to accelerate the genetic improvement of some yield and quality traits in strawberries. The cross ‘Mira’ × ‘Onda’ expressed desirable specific combining ability effects for yield traits and can be successfully use in strawberries breeding programs. In the case of ‘Alba’ × ‘Clery’ there is a high probability to select progenies with valuable yield traits associated with sweet fruits.

scholarly journals Combining ability and heterosis for fiber quality traits in cotton

2010 ◽  
Vol 62 (1) ◽  
pp. 3-16 ◽  
Author(s):  
Yuksel Bolek ◽  
Hatice Cokkizgin ◽  
Adem Bardak
Keyword(s):  
Combining Ability ◽  
Recurrent Selection ◽  
Fiber Quality ◽  
Block Design ◽  
Short Fiber ◽  
Quality Traits ◽  
Gene Effects ◽  
Fiber Quality Traits ◽  
High Fiber ◽  
Additive Gene

Combining ability and heterosis for fiber quality traits in cotton Combining ability analysis and heterosis for cotton fiber quality traits were studied in a set of diallel crosses involving eight cotton (Gossypium sp.) genotypes. Randomized complete block design was used to test 56 F1 and 8 parents for fiber quality traits; length (Len), strength (Str), micronaire (Mic), uniformity (Unf), elongation (Elg), spinning consistency index (Sci) and short fiber index (Sfi). Analysis revealed significant general combining ability (GCA) and specific combining ability (SCA) effects for all the traits and additive gene effects were important in the inheritance of the traits. Giza-45 had the highest GCA effects for Len, Sci, Unf and Elg while Is-4 had the highest Str value. Mic and Sfi values were lowest for Askabat-100 and Giza-45, respectively. The cross Cukurova-1518 × 108-F and Nazilli-84S × Askabat-100 had the lowest SCA effects for Mic and Sfi, respectively. The highest values for Len (Askabat-100 × 108-F), for Str (Acala Prema × 108-F), for Sci (Is-4 × Giza-45), for Unf (Stoneville-453 × Askabat-100) and for Elg (108-F × Is-4) were also obtained. Hybridizations among Askabat-100 × Nazilli-84S, Is-4 × Giza-45, Askabat-100 × Stoneville-453, Askabat-100 × Giza-45, Is-4 × 108F, Giza-45 × 108F, Giza-45 × Acala Prema, Nazilli-84S × Giza-45, Is-4 × Nazilli-84S and Acala Prema × Askabat-100 crosses yielded the best heterosis and heterobeltiosis values. Aforementioned parents and crosses could be utilized for further selection of high fiber quality and applying 3-way crosses or modified backcross or recurrent selection to genotypes having good combining ability would improve fiber quality.

scholarly journals Inheritance of seed quality traits and concentrations of zinc and iron in maize topcross hybrids

1970 ◽  
Vol 29 (1) ◽  
pp. 119-131
Author(s):  
R.O. Akinwale ◽  
A.O. Fadoju ◽  
B.H. Sulola ◽  
A. Oluwaranti ◽  
F.E. Awosanmi
Keyword(s):  
Seed Quality ◽  
Gene Action ◽  
Quality Traits ◽  
Additive Gene Action ◽  
Fe Content ◽  
Additive Gene ◽  
Positive Correlations ◽  
Additive Genetic Relationship ◽  
Mode Of Inheritance ◽  
Seed Quality Traits

Information about the mode of inheritance of maize (Zea mays L.) seed quality traits is crucial in planning for improvement programmes for such traits. The objective study was to determine mode of inheritance and interrelationships between seed quality traits, and Fe and Zn contents in maize. Twenty-six maize genotypes were considered for evaluation in this study. Additive gene action was prevalent for most seed quality traits (>50%); while non-additive gene action was preponderant for Fe and Zn concentrations. Inbreds TZEEI82 and TZEEI64 were outstanding in terms of GCA male effects for conductivity (-0.13** and -0.06*), root number (0.79** and 0.30*), and root fresh weight (0.90*). Genotypes TZEEI81, DTE-STR-Y-SYN-POP-C3, 2009-TZEEI-OR1-STR and 2009-TZEE-OR1-STR-QPM were identified as excellent pollen parents for Fe concentration; and TZEEI58 and TZEEI64 for Zn concentration. In addition, only germination index had a significant additive genetic relationship with Fe content (r=0.57*); while both shoot fresh and dry weights had significant positive correlations with Zn content (r=0.45*, 0.53*). Overall, it is clear that different modes of gene action control inheritance of seed quality traits and Fe and Zn concentrations.

scholarly journals Analisis Genetik dan Seleksi Segregan Transgresif pada Populasi F2 Sorgum Hasil Persilangan B69 × Numbu dan B69 × Kawali

2019 ◽  
Vol 47 (2) ◽  
pp. 163-170 ◽  
Author(s):  
Marina Yuniawati Maryono ◽  
Trikoesoemaningtyas , ◽  
Desta Wirnas ◽  
Dan Soeranto Human
Keyword(s):  
Grain Yield ◽  
Gene Action ◽  
Agronomic Characters ◽  
Additive Gene Action ◽  
F2 Population ◽  
Transgressive Segregant ◽  
Additive Gene ◽  
High Heritability ◽  
Transgressive Segregants ◽  
Selection Of

The genetic analysis and selection of transgressive segregants on agronomic characters are required in a sorghumbreeding program for obtaining high proportion homozygosity rapidly in the early generations. This study aimed to obtainthe information on the performance of agronomic characters, estimate genes’ action, broad-sense heritability, coefficient ofgenetic variability, and select transgressive segregant on F2 population of sorghum based on grain yield. The research wasconducted from July 2014 until October 2014 in Dramaga, Bogor. About 300 and 150 individuals F2 populations of B69 ×Numbu and B69 × Kawali, respectively, were used as genetic materials. The results showed that plant height and paniclelength of B69 × Numbu and B69 × Kawali populations were controlled by many genes with additive gene action. The grainyield and grain yield per panicle were controlled by many genes with additive gene action and complementary epistasis,had high heritability, and large coefficients of genetic variability. The transgressive segregant selection had selected 14individuals of B69 × Numbu and 134 individuals of B69 × Kawali populations based on grain yield per panicle.

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