scholarly journals Construction of a breeding parent population of Populus tomentosa based on SSR genetic distance analysis

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Zhiqiang Han ◽  
Qiang Han ◽  
Yufei Xia ◽  
Xining Geng ◽  
Kang Du ◽  
...  
Keyword(s):  
Genetic Distance ◽  
Combining Ability ◽  
Growth Traits ◽  
Random Mating ◽  
Specific Combining Ability ◽  
Hybrid Breeding ◽  
High Fertility ◽  
Germplasm Resources ◽  
Parent Population ◽  
High Genetic Diversity

Abstract Parent selection is the core of hybrid breeding. The breeding strategy involving the parental identification of superior open-pollinated progeny of Populous tomentosa germplasm resources can significantly improve the efficiency of parental matching. However, due to some factors such as loose powdering time and pollen competitiveness, the offspring derived from open-pollination families which do not undergo completely random mating. Although hybrid combinations based on the male identification method have a high combining ability, this method cannot easily cover the mating combinations of all male and female specimens in the germplasm bank. In addition, the performance of superior plants in open-pollinated families also affects the selection result. If the trait performance value is higher than the population average, then the special combining ability of the reconstructed hybrid combination may be overestimated. Obtaining a solution to the above problems is of great significance for improving the efficiency and accuracy of selecting hybrid parents of P. tomentosa. In this study, 24 pairs of SSR (Simple Sequence Repeats) molecular markers were used to analyze the genetic differentiation of P. tomentosa germplasm resources. The results showed that the genetic variation of the P. tomentosa population was derived from individuals within the provenance, indicating that high genetic diversity is preserved in provenances. The correlation analysis showed that there was a significant positive correlation between the special combining ability of planting height and diameter at breast height (dbh) of the 34 full-sib progeny population and the genetic distance between the parents. Then, the genetic distance between 18 female plants with high fertility and 68 male plants with large pollen quantity was analyzed using this correlation. Fifteen female parents and 12 male parents were screened out, and 52 hybrid combinations with high specific combining ability for growth traits were predicted. Furthermore, for the male parent identification of superior individual plants, we constructed the breeding parent population including 10 female parents and 5 male parents, generating 14 hybrid combinations with potentially high combining ability. The results of the hybridization test showed that the specific combining ability of plant height and dbh was significantly higher than the controlled pollination. Moreover, genetic distance and paternal identification can be used to rapidly and efficiently construct hybrid parent combinations and breeding parent populations.

scholarly journals Efficiencies of Heterotic Grouping Methods for Classifying Early Maturing Maize Inbred Lines

Agronomy ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1198
Author(s):  
Oyeboade Adebiyi Oyetunde ◽  
Baffour Badu-Apraku ◽  
Omolayo Johnson Ariyo ◽  
Christopher Olusanya Alake
Keyword(s):  
Grain Yield ◽  
Genetic Distance ◽  
Combining Ability ◽  
Diallel Cross ◽  
Hybrid Breeding ◽  
Multiple Traits ◽  
Heterotic Groups ◽  
Maize Hybrids ◽  
Heterotic Grouping ◽  
Additive Gene

The success of a hybrid breeding program is dependent on available heterotic patterns for exploitation of grain-yield heterosis. The efficiency of the assignment of germplasm lines into heterotic groups is a prerequisite for obtaining useful heterotic patterns among germplasm lines. A total of 256 maize hybrids, comprising 244 top crosses, six diallel cross hybrids, and six checks, were grown under Striga infestation, drought, and optimal conditions, from 2015 to 2017. The study determined the combining abilities of the parental inbreds, classified the inbreds into heterotic groups, and compared the efficiencies of the following four grouping methods for classifying the inbreds: specific combining ability (SCA) effect of grain yield; general combining ability (GCA) effects of multiple traits (HGCAMT); SCA and GCA (HSGCA) for yield; and single nucleotide polymorphism-based genetic distance (SNP-based genetic distance (GD)). Significant GCA and/or SCA mean squares were revealed for most measured traits in all test environments. Sums of squares (SS) due to GCA were higher than SCA SS for measured traits in all test environments. The HSGCA, SCA, and SNP-based GD methods identified four heterotic groups, whereas the HGCAMT identified three groups, in all environments. The additive gene effect was preponderant in the inheritance of most measured traits. The efficiencies of the grouping methods varied with the test environments. The HSGCA and SCA methods were the most efficient for grouping in all test conditions. For practical breeding purposes, the HGCAMT and HSGCA methods were recommended under Striga infestation and drought, respectively. The heterotic patterns, which were revealed in this study, were effective for planning hybridization schemes for developing high-yielding, Striga-tolerant/resistant, and drought-tolerant maize hybrids for stressful environments.

scholarly journals Genetic distance and specific combining ability in cassava

Euphytica ◽  
2016 ◽  
Vol 210 (1) ◽  
pp. 79-92 ◽  
Author(s):  
H. Ceballos ◽  
L. A. Becerra López-Lavalle ◽  
F. Calle ◽  
N. Morante ◽  
T. M. Ovalle ◽  
...  
Keyword(s):  
Genetic Distance ◽  
Combining Ability ◽  
Specific Combining Ability

scholarly journals Prediction Formulae for General Combining Ability Selection Methods Utilizing One or Two Random-Mating Populations

1962 ◽  
Vol 15 (4) ◽  
pp. 650 ◽  
Author(s):  
B Griffing
Keyword(s):  
Combining Ability ◽  
Random Mating ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Selection Methods

This study is the first of a series in which theoretical comparisons are made among various general combining ability and specific combining ability selection methods. The particular purpose of this study is to set out the prediction formulae for all possible general combining ability selection methods which can be generated by one or two base populations.

Relationship of parental genetic distance with agronomic performance, specific combining ability, and predicted breeding values of raspberry families

Euphytica ◽  
2018 ◽  
Vol 214 (2) ◽  
Author(s):  
Aurelio Hernández-Bautista ◽  
Ricardo Lobato-Ortiz ◽  
J. Jesús García-Zavala ◽  
Mario Rocandio-Rodríguez ◽  
José Apolinar Mejía-Contreras ◽  
...  
Keyword(s):  
Genetic Distance ◽  
Combining Ability ◽  
Specific Combining Ability ◽  
Agronomic Performance ◽  
Breeding Values ◽  
Relationship Of

scholarly journals Crossing system application and its effect on lambs growth traits

2015 ◽  
Vol 31 (4) ◽  
pp. 505-514 ◽  
Author(s):  
V. Caro-Petrovic ◽  
M.P. Petrovic ◽  
Z.Z. Ilic ◽  
M.M. Petrovic ◽  
D. Ruzic-Muslic ◽  
...  
Keyword(s):  
Body Weight ◽  
Genetic Distance ◽  
System Application ◽  
Combining Ability ◽  
Growth Traits ◽  
Average Daily Gain ◽  
A Value ◽  
Significant Difference ◽  
The Difference ◽  
Daily Gain

Success of crossing depends on the breeds used and the genetic distance among them, as well the combining ability of maternal and individual heterosis to make the proper choice of breeds employed in a crossing system. The aim of this study is to find the effect of genotype and crossing system on early weights and daily gain of lambs. The lambs of purebred Pirot Pramenka ( P) got the lowest body weight at birth, at 30 days, at 60 days and 90 days with a value of 3.65 kg, 9.48 kg, 14.99 kg and 21.96 kg while purebred Wurttemberg attained the highest body weight at birth of 4.48 kg. The lambs of three bred crossing (PxWxF) highest on BW30, BW60 and BW90 days. The results showed a highly significant difference on average daily gain (ADG) among genotypes (P ?0.01) except on the difference between W - PxW of which belongs to the lower border of significant level (P ?0.05). The highest difference on ADG was between P - PxWxF (105.950 g), wherein the lowest difference was between W- PxW (9.290 g). It can close that the attained value between pure bred Wurttemberg (W) and two-bred crossing (PxW) was almost equal. Genotype and crossing system have significant effect on body weight and average daily gain of lambs. Based on the results obtained, it shows an advantage effect of crossing system (PxWxF) when it comes on growth and daily gain of lambs.

scholarly journals Heterosis, habilidad combinatoria y diversidad genética en híbridos comerciales de maíz (Zea mays L).

2006 ◽  
Vol 11 (1) ◽  
pp. 113
Author(s):  
Alfredo De la Rosa ◽  
Humberto De León ◽  
Gaspar Martínez ◽  
Froylan Rincón
Keyword(s):  
Genetic Diversity ◽  
Zea Mays ◽  
Genetic Distance ◽  
Combining Ability ◽  
Zea Mays L ◽  
Genetic Distances ◽  
Breeding Program ◽  
Specific Combining Ability ◽  
Maize Breeding ◽  
Genetic Value

Knowledge about the combining ability, genetic diversity and heterosis of germoplasm from a maize breeding program is essential for hybrids and varieties development. The objetives of this study were (1) To identify commercial hybrids with high genetic value (GCA and heterosis) useful for initiating a maize breeding program to produce and improved hybrids, varieties and synthetics; (2) To demonstrate that is feasible to create a maize breeding program from commercial hybrids. Estimates of general (GCA) and specific combining ability (SCA) were obtained using the method IV of Griffing (1956) and the genetic distances were estimated according to the method suggested by Troyer (1988). The best crosses were AS910 X AS4450 and PP9538 X AS948 having a yield of 17.538 and 17.463 t/ha respectively; the same crosses had the highest values of SCA. The crosses with the highest values of heterosis over the midparent were PP9539 X AN453 and PP9603 X PP9539 with 11,35 and 11,13 percent respectively. The highest positive values of GCA effects were obtained from hybrids PP9539 and AN447 with 1.168 and 0.684 t/ha respectively;. and the hybrids with the best heterosis were PP9539 ( 2.269 ) and A7500 ( 1.170 ). The most related hybrids were AS910 and AN450 with a genetic distance of 0,033 and heterosis of -47,68 percent whereas the most diverse were AN454 and A7500 with a genetic distance of 1.418 and heterosis of 12,26 %.

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