Combining ability and gene action for bacterial wilt disease resistance in wild tomato (Solanum pimpinellifolium) and cultivated tomato (Solanum lycopersicum) genotypes

Faith, Wangui Mathai; Pascal, P. Okwiri Ojwang; Robert, Morwani Gesimba

doi:10.5897/ajps2021.2181

Cited by 1 publication

(6 citation statements)

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“…Genetic diversity in quantitative traits can be divided into many parts based on genes' additive dominance, and interaction effects. Majority of the link between relatives and the possibility for genetic change through natural or artificial selection by the additive genetic variance is the most significant (Mathai et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Genes may possess an additive effect on a trait's quantitative characteristics, known as additive genetic variance (Mathai et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…More substantial studies on combining abilities have been conducted on other diseases of tomatoes (Mathai et al, 2022), but not on bacterial wilt. A case in point is a half-diallel mating design used to identify three tomato lines as prospective donors for resistance to tomato yellow leaf curl virus disease (Mathai et al, 2022). While breeding for resistance to the rice yellow mottle virus disease, parental lines with negative general combining ability (GCA) values and families with negative specific combing ability (SCA) values; were chosen to harness specific alleles or traits that may not be apparent in the individual average performance (Suvi et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…While breeding for resistance to the rice yellow mottle virus disease, parental lines with negative general combining ability (GCA) values and families with negative specific combing ability (SCA) values; were chosen to harness specific alleles or traits that may not be apparent in the individual average performance (Suvi et al, 2021). Using the North Carolina II mating design in parental hybridisation, breeding populations examining the heritability of important characteristics in diverse crops have been produced by plant breeders (Mathai et al, 2022). The design makes it possible to estimate the General and Specific Combining abilities (Fasahat et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Genetic diversity and heritability of tomato parental lines assembled for Ralstonia solanacearum resistance

Mukamanasasira,

Adjei,

Rubaihayo

et al. 2024

Afr. Crop Sci. J.

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Bacterial wilt is a disease caused by Ralstonia solanacearum, which affects over 450 plant species and causes significant reduction in crop yields including of tomato (Solanum lycopersicum) worldwide. Developing and identifying tomato genotypes with Ralstonia solanacearum tolerance and high yield potential, presents an opportunity for improvement of crop productivity. The objective of this study was to explore the heritability of tomato resistance against bacterial wilt and the genetic variation within the population for breeding purposes. A breeding population was created by crossing two bacterial wilt-resistant (MT56 and BL333) and three commercially desirable susceptible (Assila, Rambo and Heinz) tomato varieties, using North Carolina Design II, in a screen house at the Makerere University Agricultural Research Institute, Kabanyolo (MUARIK). Results showed that the Area Under Disease Progress Curve was significant (P<0.001), indicating that cumulative disease progress was less in resistant genotypes of segregating generations. Disease severity increased with days after inoculation (DAI), with Heinz showing the highest level of susceptibility. The General Combining Ability for male parent (GCAm) was significant (P< 0.01), and Specific Combining Ability (SCAf×m) and GCAf were significant (P<0.01) for the F2 generation. Broad-sense heritability was higher than the narrow-sense heritability in both F1 and F2 generations, suggesting that non-additive gene action predominately controlled tomato resistance to bacterial wilt infestation. The genetic diversity ranged from 0.5 to 0.6759, with a mean value of 0.5787. Polymorphism Information Content (PIC) varied from 0.375 to 0.6357, with a mean of 0.4888, indicating a high degree of variation. SLM 12-2 was the most polymorphic marker, with a PIC of 0.6357. The Unweighted Pair-Group Method with Arithmetic Average (UPGMA) classified all tomato genotypes into six clusters, namely Clusters 1 and 2 (Susceptible parents), Cluster 3 (Resistant parents), Clusters 4 and 5 (New source of resistance), and Cluster 6 (F1P1×P5).

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Section: Introductionmentioning

confidence: 99%

“…Genes may possess an additive effect on a trait's quantitative characteristics, known as additive genetic variance (Mathai et al, 2022).…”

Section: Introductionmentioning

confidence: 99%