Heterosis and combining ability for yield and other agronomic traits in Triticale

Ferrari, Enzo; Picca, Aurora; Domínguez, R.; Paccapelo, H. A.

doi:10.1515/opag-2018-0005

Cited by 2 publications

(2 citation statements)

References 15 publications

(19 reference statements)

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“…Parental genotypes that display high GCA values for specific traits of interest are usually the most suited for integration into breeding programs considering that there would be more transmission of those traits to their offspring because of the additive effects. Crosses with higher SCA values, however, are specifically preferred in the development of hybrid programs ( De la Cruz-Lázaro et al, 2010 ; Ferrari et al, 2018 ). It is therefore recommended that the best performing parental genotypes and families identified through this study be deployed in view of this.…”

Section: Discussionmentioning

confidence: 99%

Combining ability and heritability analysis of sweetpotato weevil resistance, root yield, and dry matter content in sweetpotato

et al. 2022

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Efficient breeding and selection of superior genotypes requires a comprehensive understanding of the genetics of traits. This study was aimed at establishing the general combining ability (GCA), specific combining ability (SCA), and heritability of sweetpotato weevil (Cylas spp.) resistance, storage root yield, and dry matter content in a sweetpotato multi-parental breeding population. A population of 1,896 F1 clones obtained from an 8 × 8 North Carolina II design cross was evaluated with its parents in the field at two sweetpotato weevil hotspots in Uganda, using an augmented row-column design. Clone roots were further evaluated in three rounds of a no-choice feeding laboratory bioassay. Significant GCA effects for parents and SCA effects for families were observed for most traits and all variance components were highly significant (p ≤ 0.001). Narrow-sense heritability estimates for weevil severity, storage root yield, and dry matter content were 0.35, 0.36, and 0.45, respectively. Parental genotypes with superior GCA for weevil resistance included “Mugande,” NASPOT 5, “Dimbuka-bukulula,” and “Wagabolige.” On the other hand, families that displayed the highest levels of resistance to weevils included “Wagabolige” × NASPOT 10 O, NASPOT 5 × “Dimbuka-bukulula,” “Mugande” × “Dimbuka-bukulula,” and NASPOT 11 × NASPOT 7. The moderate levels of narrow-sense heritability observed for the traits, coupled with the significant GCA and SCA effects, suggest that there is potential for their improvement through conventional breeding via hybridization and progeny selection and advancement. Although selection for weevil resistance may, to some extent, be challenging for breeders, efforts could be boosted through applying genomics-assisted breeding. Superior parents and families identified through this study could be deployed in further research involving the genetic improvement of these traits.

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Section: Discussionmentioning

confidence: 99%

Combining ability and heritability analysis of sweetpotato weevil resistance, root yield, and dry matter content in sweetpotato

et al. 2022

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“…However, heterotic effect in the subsequent generations may be lost when dominant gene effects are effective in the inheritance of the studied feature. Many researchers have reported high SCA, Ht and Hb values for these characteristics (Ahmad et al, 2017;Ferrari et al, 2018;Rajput and Kandalkar, 2018). While Ht of spike harvest index was positive in all groups in F1, Ht-Hb values were lower and negative in F2 generation due to the decrease of heterozygosity.…”

Section: Heterotic Grouping Based On Specific Combining Ability and Hmentioning

confidence: 99%

USING LINE × TESTER METHOD AND HETEROTIC GROUPING TO SELECT HIGH YIELDING GENOTYPES OF BREAD WHEAT (Triticum aestivum L.)

Kutlu¹,

Sirel²

2019

Turkish Journal of Field Crops

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Studies on genetic gain, made by direct or indirect phenotypic selection, are needed regularly since they offer valuable information for breeding programs. The purpose of this study to investigate the gene effects on the yield-related traits of the F1 and F2 populations of bread wheat "line×tester" crosses; to identify suitable parents and promising hybrids for development of high yielding varieties; to determine correlations between genetic distances of the parents and heterosis with heterotic groups (HG) based on specific combining ability (SCA). The combining abilities, heritability, heterosis (Ht)-heterobeltiosis (Hb) and the potential of populations as a HG were analysed. According to the results, non-additive gene effects were predominated and narrow sense heritability was low for all examined features, significant combining ability effects were determined for some parents and hybrids. While DH18, DH20 and Harmankaya-99 were good combiners, "DH16×Altay-2000", "DH16×Kate A-1" and "DH21×Kate A-1" were promising hybrids. The yield, Ht and SCA were higher in inter-group hybrids than intra-group hybrids in HG. Although molecular markers are considered more reliable to create HG, only marker selection will not adequate to improve the trait in question because of complex genetic structure and environmental influence. Therefore, HG based on yield-specific SCA can be utilized as a reliable parameter in breeding studies.

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Heterosis and combining ability for yield and other agronomic traits in Triticale

Abstract: Abstract:The estimation of genetic parameters such as heterosis (Mh

Cited by 2 publications

References 15 publications

Combining ability and heritability analysis of sweetpotato weevil resistance, root yield, and dry matter content in sweetpotato

Combining ability and heritability analysis of sweetpotato weevil resistance, root yield, and dry matter content in sweetpotato

USING LINE × TESTER METHOD AND HETEROTIC GROUPING TO SELECT HIGH YIELDING GENOTYPES OF BREAD WHEAT (Triticum aestivum L.)

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