Combining Ability for Kernel Starch Content in Maize Synthetic Populations  Obtained from Local Populations

Synthetic populations of maize (Zea mays L) are low-cost and stable varieties, obtained by cross pollination of a group of inbred lines, local population or hybrids. The main advantage of these populations is that the heterosis does not diminish significantly in F2. In order to complete the research on the combining ability of maize synthetic populations, the objective of this work was to study seven maize synthetic populations, determining their general combining ability (GCA) and specific combining ability (SCA) for kernel starch content, as well as their potential as source populations in breeding programmes.To achieve the proposed objectives, we studied top cross hybrids of the type â€œinbred line x synthetic populationâ€ resulted from the crossing between seven synthetic maize populations and four early inbred lines used as tester. For all experimental conditions, the differences between genotypes were statistically assured for kernel starch content. The experimental years and testing locations have provided conditions for differentiation of genotypes for starch content and interactions between the environment and genotypes were statistically significant, indicating dependence of starch content on environmental conditions. The additive effects for starch content provided by GCA were high for Tu SRR 5DR(6I)(5) and Tu SRR 5D (2I)(2). Non additive effects, corresponding to SCA were high for the following hybrid combinations: TC 233 x TuSyn 1 (3), CO 255 x Tu SRR 5D (2I)(2) and TC 209 x Tu SRR 5DR(6I)(5). In the case of synthetic maize populations, the determinism of starch is influenced equally by GCA and SCA.

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Combining ability of twelve maize populations

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2002000100009 ◽

2002 ◽

Vol 37 (1) ◽

pp. 67-72 ◽

Cited By ~ 13

Author(s):

Elton Vacaro ◽

José Fernandes Barbosa Neto ◽

Diego Girardi Pegoraro ◽

Claudio Natalino Nuss ◽

Leo Duc Haa Conceição

Keyword(s):

Combining Ability ◽

Environmental Influence ◽

Genetic Progress ◽

Breeding Programs ◽

Maize Populations ◽

Population Improvement ◽

Source Populations ◽

Stalk Lodging ◽

Genetic Phenomenon ◽

Ear Number

Genetic progress depends on germplasm quality and breeding methods. Twelve maize populations and their crosses were evaluated to estimate combining ability and potential to be included as source populations in breeding programs. Plant height, point of insertion of the first ear, number of ears per plant, number of grains per ear, root and stalk lodging and grain yield were studied in two locations in Brazil, during the 1997/98 season. Genotype sum of squares was divided into general (GCA) and specific (SCA) combining ability. Results indicated the existence of genetic divergence for all traits analyzed, where additive effects were predominant. The high heterosis levels observed, mainly in Xanxerê, suggested the environmental influence on the manifestation of this genetic phenomenon. Populations revealed potential to be used in breeding programs; however, those more intensively submitted to selection could provide larger genetic progress, showing the importance of population improvement for the increment of the heterosis in maize.

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Combining Ability for Yield of Single-Cross Hybrids Derived from Maize Composites (Zea mays L.)

Notulae Botanicae Horti Agrobotanici Cluj-Napoca ◽

10.15835/nbha47111358 ◽

2018 ◽

Vol 47 (2) ◽

pp. 465-469 ◽

Cited By ~ 1

Author(s):

Andreea Daniela ONA ◽

Leon MUNTEAN ◽

Voichița Virginia HAȘ ◽

Andrei VARGA

Keyword(s):

Combining Ability ◽

Recurrent Selection ◽

Zea Mays L ◽

Maize Yield ◽

Inbred Lines ◽

Yield Potential ◽

Synthetic Populations ◽

Yield Trait ◽

Additive Genetic Effects ◽

Single Cross Hybrids

Development of high-yielding hybrids of maize depends on good understanding of combining ability and inheritance of yield trait. To achieve this goal, synthetic populations of lines are developed and improved upon by recurrent selection to be utilized as initial material for the creation of inbred lines. Therefore, the aims of the present paper were: to determine the combining ability among some inbred lines developed from composites and commercial hybrids by recurrent selection method and to choose the most promising inbreds for maize yield improvement and the most suitable hybrid combinations. The highest value of the general combining ability (GCA) was obtain from inbred line TA 447 (1,655 kg ha-1) followed by tester TC 399 (233 kg ha-1). For the specific combining ability (SCA), TA 447 × TC 385 A, TA 427 × TC 399, TA 428 × TC 399 and CO 305 × TD 268 had good compatibility. The research concluded that GCA was more important that SCA, indicating that the additive genetic effects are mainly involved in the heredity of yield potential of maize. For the non-additive effects to increase, the next selection cycles must focus on plants’ pairs with more pronounced heterosis for the yield trait.

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Agronomic evaluation and combining ability of tomato inbred lines selected for the industrial segment

Horticultura Brasileira ◽

10.1590/s0102-053620160000100013 ◽

2016 ◽

Vol 34 (1) ◽

pp. 86-92 ◽

Cited By ~ 3

Author(s):

Alex ST Figueiredo ◽

Juliano TV Resende ◽

Marcos V Faria ◽

Juliana T Paula ◽

Diego A Rizzardi ◽

...

Keyword(s):

Combining Ability ◽

Inbred Lines ◽

Commercial Production ◽

Soluble Solids ◽

Pulp Yield ◽

Additive Effects ◽

Soluble Solids Content ◽

Average Mass ◽

Agronomic Evaluation ◽

Solids Content

ABSTRACT: This study carried out agronomic evaluation and estimated the combining ability of tomato lines for the industrial segment, aiming to elect promising genotypes for breeding and to find simple hybrids with superior traits. Randomized-blocks design was used with 57 treatments (45 experimental hybrids, 10 lines and 2 checks treatments) with 3 replications. A complete diallel among 10 tomato lines for processing was used. Evaluated traits were: fruit total (YT) and commercial production (YC), pulp yield (YP), fruit average mass (MM) and total soluble solids content (TSS). Diallel crosses allowed synthesizing experimental hybrids with superior traits when compared to commercial hybrids. Non-additive effects prevailed over the expression of YT, YC, YP and TSS, whereas additive effects prevailed for MM. Lines RVT-08, RVT-05 and RVT-10 are most appropriate for intrapopulational breeding. Experimental hybrids RVT-08 x RVT-09, RVT-07 x RVT-10 and RVT-08 x RVT-10 were pointed as the experimental genotypes with the best performance, surpassing the commercial genotypes for the traits evaluated.

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General and specific combining ability of cotton germplasm in Mozambique using circulant dialells

Australian Journal of Crop Science ◽

10.21475/ajcs.21.15.06.p3177 ◽

2021 ◽

pp. 933-939

Author(s):

Leonel Domingos Moiana ◽

Pedro Soares Vidigal Filho ◽

Manuel Pedro Maleia ◽

Sudanailly Mufambira ◽

Joaquim João ◽

...

Keyword(s):

Climate Change ◽

Genetic Diversity ◽

Experimental Design ◽

Combining Ability ◽

Inbred Lines ◽

General Combining Ability ◽

Specific Combining Ability ◽

Additive Effects ◽

Cotton Yield ◽

Seed Cotton

The genetic diversity of species is an important way to maintain the natural capacity to respond to climate change and all stresses. This study aimed to estimate the general combining ability (GCA) and the specific combining ability (SCA) of the characteristics among 41 cotton cultivars and 9 inbred lines using circulant diallel. In 2016, 41 cultivars and 9 inbred lines and 75 hybrid combinations were evaluated at the Namialo Cotton Research and Seed and Multiplication Centre in the Meconta District, Nampula province. The experimental design was Federer's augmented blocks with four repetitions. The evaluated characteristics were: days for 50% of flowering (DAFlw), days for 50% of fruiting (DAFrut), plant height, average number of bolls (AnB), seed cotton yield in kilograms per hectare (Yield) and the mass of one hundred seeds (M100). The algorithm for establishing diallel crosses was based on Kempthorne and Curnow, where S was equal to 3. There was a predominance of non-additive effects for all characteristics analysed. The genotypes ALBAR FQ 902, IRMA 12-43 and MARICO showed greater additive effects for DAFlw, DAFrut, AnB, Yield and, M100

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Diallel analysis of maize inbred lines for grain yield, oil and protein content

Cropp Breeding and Applied Biotechnology ◽

10.1590/s1984-70332014000100004 ◽

2014 ◽

Vol 14 (1) ◽

pp. 23-28 ◽

Cited By ~ 7

Author(s):

Amir José Klein Werle ◽

Fernando Rafael Alves Ferreira ◽

Ronald José Barth Pinto ◽

Claudete Aparecida Mangolin ◽

Carlos Alberto Scapim ◽

...

Keyword(s):

Grain Yield ◽

Protein Content ◽

Combining Ability ◽

Crude Protein ◽

Oil Content ◽

Diallel Analysis ◽

Negative Influence ◽

Inbred Lines ◽

Additive Effects ◽

Additive Genetic Effects

This study aimed to investigate the combining ability and heterotic effects on grain yield (GY), oil content (OC) and crude protein (CP) in tropical and temperate maize lines. Hybrids and inbred lines were evaluated in a complete diallel scheme without reciprocals, in two experiments in randomized blocks with three replications. The partitioning of the sum of squares for general (GCA) and specific (SCA) combining ability indicated that both additive and non-additive effects were involved in the genetic control of the studied traits. The estimates of the quadratic components showed predominance of non-additive genetic effects in the trait control. However, for OC and CP, the non-additive effect had a clearly negative influence on the hybrid combinations. The cross L6x L10was considered promising, because it associated RG positively with BP and OC.

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Combining ability and genetic divergence among tropical maize inbred lines using SSR markers

Acta Scientiarum Agronomy ◽

10.4025/actasciagron.v43i1.53317 ◽

2021 ◽

Vol 43 ◽

pp. e53317

Author(s):

Tauana Gibim Eisele ◽

Dener Lazzari ◽

Tereza Aparecida da Silva ◽

Ronald José Barth Pinto ◽

Robson Akira Matsuzaki ◽

...

Keyword(s):

Grain Yield ◽

Ssr Markers ◽

Genetic Divergence ◽

Combining Ability ◽

Inbred Lines ◽

Simultaneous Increase ◽

Additive Effects ◽

Tropical Maize ◽

Maize Inbred Lines ◽

Ear Height

Our objectives were to evaluate general and specific combining ability (SCA) and genetic divergence among tropical maize inbred lines using single sequence repeat (SSR) markers. Thirteen inbred lines were crossed based on a complete diallel scheme. Hybrids and three checks were evaluated in a lattice experimental design. Silk and anthesis flowering, average plant height, average ear height, white spot (Pantoea ananatis) and gray leaf spot (Cercospora zeae-maydis) severity, and grain yield were evaluated. Significant differences (p < 0.05) for general and specific combining abilities were observed for all traits. Based on additive effects, inbred lines 1 (Flash) and 12 (SG 6015) were selected to reduce the flowering period and plant and ear height. Inbred lines 2 (CD 303) and 3 (AG 8080) were selected to reduce disease severity. For the simultaneous increase in grain yield and reduced severity of diseases, line 11 (AG 9090) as a parent or tester in topcross schemes is recommended. According to non-additive effects, crosses 2 (CD 303) × 13 (DKB 747) and 11 (AG 9090) × 12 (SG 6015) were selected for grain yield and future breeding programs. Six groups were identified using SSR markers; a major group contained six inbred lines. Because of the minor relationship between genetic divergence and SCA effects on grain yield limits, the use of the groups for future divergent crosses is recommended.

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POTENCIAL DE LINHAGENS ORIUNDAS DE POPULAÇÕES DE MILHO BRAQUÍTICO PARA OBTENÇÃO DE HÍBRIDOS

Revista Brasileira de Milho e Sorgo ◽

10.18512/1980-6477/rbms.v16n1p120-130 ◽

2017 ◽

Vol 16 (1) ◽

pp. 120

Author(s):

BELISA CRISTINA SAITO ◽

JOÃO ANTÔNIO DA COSTA ANDRADE

Keyword(s):

Grain Yield ◽

Combining Ability ◽

Inbred Lines ◽

General Combining Ability ◽

Maize Populations ◽

Single Cross ◽

Ear Height ◽

Stalk Lodging ◽

Partial Diallel ◽

Single Cross Hybrids

RESUMO - O objetivo do trabalho foi a identificar linhagens com alta capacidade de combinação visando o desenvolvimento de híbridos simples adaptados à condição de elevada densidade populacional de plantas. Treze linhagens originadas de duas populações de milho braquítico foram cruzadas seguindo o esquema de dialelo parcial (6x7). Os híbridos simples foram avaliados em duas safras (primeira e segunda safras). Os efeitos da interação entre as capacidades gerais de combinação (CGC) e safras foram diferentes para rendimento de grãos apenas para linhagens Isanão-VD1, enquanto que para a altura de plantas, altura de espigas e acamamento mais quebramento os efeitos da interação CGCs x safras foram diferentes para ambos os grupos de linhagens. Levando em consideração apenas o rendimento de grãos, os melhores híbridos são esperados entre as linhagens IVF1-5 e IVF1-10 da população Isanão VF1 e IVD1-1 e IVD1-2 da população Isanão-VD1. Considerando-se todos os caracteres, as linhagens promissoras para a primeira safra são IVF1-6, IVD1-1 e IVD1-5, e para a segunda safra as linhagens são IVF1-10, IVD1-8 e IVD1-9. Os híbridos mais adequados são IVF1-10 x IVD1-5 para primeira safra e IVF1-10 x IVD1-8 e IVF1-10 xIVD1-9 para a segunda.Palavras-chave: dialelo parcial, capacidade geral de combinação, capacidade específica de combinação.POTENTIAL OF INBRED LINES DERIVED FROM BRACHYTIC MAIZE POPULATIONS FOR OBTAINING HYBRIDSABSTRACT - The objective of this study was to identify parents with high combining ability aiming at the development of outstanding hybrids. Thirteen inbred lines originated of two brachytic maize populations were crossed following the partial diallel (6x7) scheme. The single-cross hybrids were evaluated in two crop seasons (regular crop and second crop). The effects of interaction general combining abilities (GCAs) x seasons were different for yield only for lines of Isanão-VD-1, while for plant height, ear height and stalk lodging and breaking, the effects of interaction GCAs x seasons were different for both groups of lines. Taking into account only the grain yield, the best hybrids are expected between the inbred lines IVF1-5, and IVF1-10, of the population Isanão-VF1 and IVD1-1 and IVD1-2 and IVD1-5 of the population Isanão-VD1. Considering all the traits, the inbred lines promising for the first crop are IVF1-6, IVD1-1 and IVD1-5 and for the second crop are the inbred lines IVF1-10, IVD1-8 and IVD1-9. The most suitable hybrids are IVF1-10 x IVD1-5 for the first crop and IVF1-10 x IVD1-8, and IVF1-10 xIVD1-9 for second crop.Keywords: partial diallel, general combining ability, specific combining ability.

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