Hierarchical and optimization methods for the characterization of tomato genotypes

Peixoto, Joicy Vitória Miranda; Almeida, Rafaela Santos de; Rocha, Jaíne Priscila R. da; Maciel, Gabriel Mascarenhas; Santos, Nádya Carrilho; Pereira, Lucas Medeiros

doi:10.1590/1807-1929/agriambi.v23n1p27-32

Cited by 5 publications

(3 citation statements)

References 17 publications

(21 reference statements)

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“…In the present study, achieving higher lycopene and soluble solids content was made possible by the genetic variation of the genotypes, without requiring more complex biotechnological techniques that involve gene manipulation. Lucini et al, 2015;Rakha et al, 2017;Maciel et al, 2018a;Peixoto et al, 2019;Peixoto et al, 2020). In this study, the wild tomato S.pennellii had high contents of the acylsugar allelochemical (mean of 36.66 nmol cm -2 of leaf area), as was expected (Figure 3).…”

Section: Resultssupporting

confidence: 83%

Agronomic potential, pest resistance, and fruit quality in BC1F3 dwarf round tomato populations

et al. 2022

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Combining broad pest resistance, high yield, and nutritional quality of fruit in the same hybrid is a challenge for round tomato breeders. Thus, development of a dwarf round tomato line for obtaining hybrids may be an excellent alternative for achieving such objectives. The aim of this study was to evaluate the agronomic potential, fruit quality, and pest resistance of BC1F3 dwarf round tomato populations. We evaluated 13 treatments and 4 replications. Treatments consisted of 10 BC1F3 dwarf populations originating from self-fertilization of dwarf populations selected in BC1F2, plus both parents (recurrent and donor) and a commercial hybrid. The traits evaluated were yield, number of fruit, mean weight, number of locules, shape, pulp thickness, longitudinal and transverse diameter of the fruit, precocity index, and soluble solids, β-carotene, lycopene, and acylsugar content. The data were analyzed through the means test. In general, there was an increase of up to 1035% in average fruit weight of the dwarf populations in relation to the donor parent. In addition, some dwarf populations had fruit with 49% more lycopene compared to the commercial hybrid, as well as greater acylsugar content in the leaves (273%). The UFU-DW22 dwarf population stood out with good agronomic potential, higher lycopene content in the fruit, and high acylsugar content, which provides pest resistance. To continue this research, a second backcross is suggested in order to obtain lines and, posteriorly, hybrids with round fruits and compact plants, pest resistance and nutritional quality of fruit.

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Section: Resultssupporting

confidence: 83%

Agronomic potential, pest resistance, and fruit quality in BC1F3 dwarf round tomato populations

et al. 2022

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“…The dendrogram exhibited a cophenetic correlation coefficient of 0.88 and significance according to the t test (p<0.01), making it a satisfactory tool to represent the information in the matrix and subsequent group formation. In other studies on tomato crops, the UPGMA method was also efficient at discriminate groups (Araujo et al, 2016;Maciel et al, 2018a;Peixoto et al, 2018). With the 30% cutoff point in the dendrogram, the populations formed three distinct groups.…”

Section: Resultsmentioning

confidence: 79%

Agronomic potential of BC1F2 dwarf round tomato populations

et al. 2020

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The use of dwarf lines to obtain mini-tomato hybrids has provided agronomic and economic benefits. In Brazil, round tomatoes predominate over other varieties. The benefits of using a dwarf parent in round tomato hybrids has yet to be explored, making it important to develop dwarf round tomato lines. Backcrossing is the most suitable method to develop these lines. Evaluation and selection of the dwarf populations can improve the development of such lines. Thus, the aim of this study was to select BC1F2 populations of dwarf round tomatoes with agronomic potential and high-quality fruit. The study was conducted at the Vegetable Experimental Station of the Federal University of Uberlândia (UFU). A randomized block design was used, with 15 treatments and three replicates. The genetic material analyzed consisted of 12 BC1F2 dwarf tomato populations, plus both parents (recurrent and donor) and a commercial hybrid. The characteristics assessed were: average fruit weight (g), total soluble solids (ºBrix), number of locules (locules per fruit-1), fruit shape, pulp thickness (cm), longitudinal (cm) and transverse fruit diameter (cm), internode length (cm) and plant height (cm). The data were submitted to mean testing, multivariate analyses and a selection index. In general, average fruit weight in the dwarf populations increased significantly after the first backcross, with some fruits exhibiting a similar shape to round tomatoes. Selection of the populations UFU-DTOM7, UFU-DTOM10, UFU-DTOM5, UFU-DTOM9, and UFU-DTOM3 resulted in an estimated 6% increase in the number of locules, transverse diameter, TD/LD ratio and average fruit weight. The BC1F2 dwarf populations UFU-DTOM7 and UFU-DTOM10 were the most promising for develop inbred lines with round fruits. Despite the considerable progress achieved in this study, we suggest a second backcross, in order to obtain lines and, posteriorly, hybrids with round fruits and compact plants.

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“…Overall, performance per se is one of the main standards applied in the selection of superior tomato genotypes. For that matter, the univariate analysis using the Scott-Knott test of means (Scott and Knott, 1974) has been widely used by several authors (Araújo et al, 2016;Borba et al, 2017;Finzi et al, 2017;Maciel et al, 2018;Peixoto et al, 2018). Nevertheless, it is known that this type of selection can be inefficient, because it leads to a superior genotype in no more than one characteristic.…”

Section: Introductionmentioning

confidence: 99%

Research Report Genetic gain according to different selection criteria for agronomic characters in advanced tomato lines

Finzi¹,

Maciel²,

Peixoto³

et al. 2020

Genet. Mol. Res.

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Tomatoes are an important crop in Brazil. In advanced stages of breeding programs, the capacity to select or reject tomato lines becomes complex. We selected tomato lines comparing different selection strategies. We evaluated 115 advanced tomato lines from the Tomato Germplasm bank of the Federal University of Uberlândia. The following characteristics were evaluated: total chlorophyll content, foliar temperature, number of fruits, yield, distance between the first cluster and the soil, transverse and longitudinal fruit diameter, internode length and total soluble solids. Data was submitted to variance analysis, Scott-Knott's test of means, and selection gains estimates: direct and indirect selection, the classic Smith and Hazel index (SH), the Williams' base index (W), the genotype-ideotype distance index (GID) and the Mulamba and Mock's sum of ranks (MM). According to the Scott-Knott's test, the lines clustered in two groups for the variables number of fruits, yield, and distance between the first cluster and the soil. There was no consistency between the different selection indexes. Selecting 9% of the lines, total selection gains estimate for selection indexes were 12.57 (SH), and 38.57% (MM). With genetic gains more equally ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 19 (1): gmr18462 R.R. Finzi et al. 2distributed among the characters, the MM index is suggested as the most appropriate for advanced stages of tomato breeding programs.

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Hierarchical and optimization methods for the characterization of tomato genotypes

Cited by 5 publications

References 17 publications

Agronomic potential, pest resistance, and fruit quality in BC1F3 dwarf round tomato populations

Agronomic potential, pest resistance, and fruit quality in BC1F3 dwarf round tomato populations

Agronomic potential of BC1F2 dwarf round tomato populations

Research Report Genetic gain according to different selection criteria for agronomic characters in advanced tomato lines

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