Relevance of Specific versus General Combining Ability in Winter Wheat

Gowda, Manje; Longin, C. Friedrich H.; Lein, Volker; Reif, Jochen C.

doi:10.2135/cropsci2012.04.0245

Cited by 61 publications

(71 citation statements)

References 30 publications

(53 reference statements)

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“…Recent large scale-phenotyping activities involving extended collections of inbred lines and hybrids, however, revealed a positive commercial heterosis for grain yield in hybrid winter wheat adapted to Central Europe (Gowda et al 2012 ;Longin et al 2013 ). Thus, a change from line to hybrid varieties has the potential to break the yield barriers in wheat breeding.…”

Section: Advantages Of Hybrids In Comparison To Linesmentioning

confidence: 99%

Hybrid Breeding in Wheat

Mette

Gils

Longin

et al. 2015

Advances in Wheat Genetics: From Genome to Field

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Despite promising superior performance, hybrid wheat currently occupies only a niche sector in commercial wheat production. However, with the recent development of practicable hybrid seed production systems, a switch from line to hybrid breeding in wheat seems realistic. Here, we discuss what consequence this may have for wheat breeding programs and provide suggestions on how quantitative genetic analysis can contribute to design optimal selection strategies.

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Section: Advantages Of Hybrids In Comparison To Linesmentioning

confidence: 99%

Hybrid Breeding in Wheat

Mette

Gils

Longin

et al. 2015

Advances in Wheat Genetics: From Genome to Field

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“…The per se performance and combining ability of inbred lines are the primary indicators to predict the performance of the derived hybrids (Gowda et al, 2012, Ertiro et al,2013. The general combining ability (GCA) can estimate the average performance of the inbred line in hybrid combination across multiple crosses, while specific combining ability (SCA) provides information about the performance of hybrid (Kenga et al, 2004).…”

Section: Per Se Performance and Combining Ability Of Inbred Parentsmentioning

confidence: 99%

“…In addition, the variance in GCA is mainly due to additive genetic effects and higher order additive interactions while the variance in SCA can be explained by noadditive genetic dominance and other epistasis effects (Falconer and Mackay, 1996). This is important information for breeders making decisions on the breeding methods used for the genetic improvement of target traits (Gowda et al, 2012).…”

Section: Per Se Performance and Combining Ability Of Inbred Parentsmentioning

confidence: 99%

“…The prediction efficiency of inbred per se performance and the GCA effect vary depending on the relative importance of additive genetic variances which in turn relate to the level of genetic variation of the inbred parents (Betrȃn et al, 2003a;Reif et al, 2007) and environmental variability (Gowda et al, 2012). A higher ratio of GCA over SCA is prevalent when there is an increasing difference in allelic frequency between the inbred parents which leads to a higher correspondence between inbred line and hybrid performance in triticale and wheat (Gowda et al, 2012).…”

Section: Per Se Performance and Combining Ability Of Inbred Parentsmentioning

confidence: 99%

“…A higher ratio of GCA over SCA is prevalent when there is an increasing difference in allelic frequency between the inbred parents which leads to a higher correspondence between inbred line and hybrid performance in triticale and wheat (Gowda et al, 2012). A recent study on extra early maturing maize highlighted the importance of additive genetic variance for grain yield and other agronomic traits in their hybrids in contrasting environments in West Africa (BaduApraku et al, 2013).…”

Section: Per Se Performance and Combining Ability Of Inbred Parentsmentioning

confidence: 99%

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Genetic differentiation, heterotic performance and grain yield determinate traits of locally adapted sorghum genotypes in contrasting environments in Ethiopia

Mindaye¹

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The increase superiority in characteristics such as size, growth rate, fertility, yield and general fitness of hybrids produced by crossing genetically diverse inbred parents is well established in many plant and animal species. This phenomenon has been exploited to produce commercial cultivars in a range of crop species including sorghum.In sorghum F1 hybrid seed is produced by crossing genetically distinct restorer (R lines) and cytoplasmic male sterile seed parent (A lines). In the developed world commercial cultivars are almost exclusively F1 hybrids and are increasingly being used in the developing countries. In spite of the yield advantage in some circumstances, however, hybrids developed using introduced parental lines have not been adopted by Ethiopian farmers primarily because of the extra cost of purchasing seed has not been outweighed by the benefits of introduced hybrids in particular the lack of farmer preferred traits such as tall stature and larger grain size. The development of hybrids using locally adapted genotypes could have the potential to overcome the shortcomings of introduced hybrids. However, the complex cytoplasmic male sterility system and prevalence of restorer genes complicate the development of new Additionally, the hybrids derived from these locally adapted genotypes will have the benefit of containing farmers preferred traits. The groups most divergent from the introduced A/B lines were the Ethiopian landraces adapted to highland and intermediate agro-ecologies and a subset of lowland adapted genotypes. These genotype groups were also grouped distinctly from the introduced R lines, and hence provide highly divergent parental lines for hybrid development in Ethiopia.The performance and magnitude of heterosis of 139 F1 hybrids, derived from introduced seed parents crossed with selected locally adapted genotypes and introduced R lines, were evaluated in three contrasting environments. The lowland adapted hybrids displayed a mean better parent heterosis (BPH)iii of 19% and a 29% increase in grain yield, on average, in comparison to the hybrids derived from the introduced R lines. In addition, these hybrids were also found to be superior in plant height and grain weight. The mean BPH for grain yield for the highland adapted hybrids was 16% in the highland and 52 % in the intermediate, in addition to increased grain weight. The magnitude of heterosis between the three hybrid groups reflected the genetic distance between the genotype groups with the A/B lines.These results highlight the potential of locally adapted genotypes for the exploitation of heterosis in Ethiopia.In order to understand the genetic basis of increased hybrid performance, the relationship between yield component traits was assessed and the genetic variance for each subset of hybrid group was partitioned into parental lines and their interaction effects. In the lowland environment, increase in grain number and grain weight contributed to increased yield of the lowland adapted hybrids in comparison to the intro...

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