Growth habit in mini tomato hybrids from a dwarf line

Finzi, Rafael Resende; Maciel, Gabriel Mascarenhas; Clemente, Andressa Alves

doi:10.14393/bj-v33n1a2017-35763

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…The BC 1 F 2 populations and inbred lines belong to the UFU tomato germplasm. The recurrent parent and commercial hybrid have an indeterminate growth habit and red round fruit, while the UFU MC TOM1 dwarf line used as the donor parent, have an indeterminate growth habit and grape-type fruits (Finzi et al, 2017b;Silva;Fernandes, 2015). Since the dwarf phenotype is recessive and monogenic Silva;Fernandes, 2015), backcrosses were performed in way to transfer at recessive allele.…”

Section: Methodsmentioning

confidence: 99%

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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Section: Methodsmentioning

confidence: 99%

Agronomic potential of BC1F2 dwarf round tomato populations

et al. 2020

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“…Plant height (FPH and PHH) is considered a parameter of great interest in tomato breeding programs [24] , and can be affected by genetic and environmental factors [3] . If growth habit is taken into account as a determinant of plant height, it is re-ported that this condition is mainly governed by a recessive gene in homozygous state (self-pruning, spsp) for the given growth habit [3,[28][29][30] . In this study the highest values of h 2 g were determined for FPH 0.92 and for PHH 0.88, which, in turn, allowed determining high GG that could relate these parameters to additive type genes [24] , therefore, it could be considered that selection by growth habit is feasible considering plant height as an indicator.…”

Section: Discussionmentioning

confidence: 99%

Selection criteria for tomato lines with defined growth habit

Burbano-Erazo¹,

Pastrana-Vargas²,

Mejía-Salazar³

et al. 2022

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Introduction: The selection of genotypes with determinate growth habit in tomato should contemplate adequate selection criteria to increase the efficiency of the breeding program. Objective: The objective of this work was to estimate selection criteria for “chonto” type tomato lines with determined growth habit. Materials and methods: This work was carried out at the Universidad Nacional de Colombia (Palmira Campus), in 2016, with seven lines with determinate growth habit and a control with indeterminate growth. Heritability in a broad sense (h2 g), coefficient of environmental variation, coefficient of genetic variation, selection efficiency and genetic gain were determined in parameters of morphological, phonological, fruit quality, fruit shape and production, using the RELM/BLUP procedure of the SELEGEN software. Results: There were three ranges of h2 g, the first with values of h2 g greater than 0.76, the second between 0.53 and 0.38, and the third with a value less than 0.38. The highest values of h2 g were for final plant height with 0.92, plant height at harvest with 0.88, yield per plant with 0.83, days to flowering with 0.83, number of fruits per plant with 0.82, and days to harvest with 0.82. For genetic gain it was found that the control had the highest values for final plant height, plant height at harvest, internode length, days to harvest, harvest duration, soluble solids content, number of fruits per plant, fruit weight and yield per plant; however, in some parameters such as height and phenology for selection by determined growth habit, the lowest values were better. Conclusion: There was evidence of genetic parameters that could be considered as selection criteria for “chonto” type tomato lines with determinate growth habit.

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“…La altura de la planta (AFP y APC) se considera un parámetro de gran interés en programas de mejoramiento de tomate (Kumar et al, 2013), y puede estar afectada por factores de tipo genético y ambiental (Vallejo, 1999). Si se tiene en cuenta el hábito de crecimiento como determinante de la altura de planta, se reporta que esta condición está gobernada, principalmente, por un gen recesivo en estado homocigoto (self pruning, spsp) para el hábito de crecimiento determinado (Pnueli et al, 1998;Vallejo, 1999;Carmel-Goren et al, 2003;Finzi et al, 2017). En este estudio los mayores valores de h 2 g se determinaron para AFP 0,92 y para APC 0,88, que, a su vez, permitieron determinar altas GG que podrían relacionar estos parámetros con genes de tipo aditivo (Kumar et al, 2013), por tanto, podría considerarse que la selección por hábito de crecimiento es factible teniendo en cuenta como indicador la altura de planta.…”

Section: Discussionunclassified

Criterios de selección en líneas de tomate con hábito de crecimiento determinado

et al. 2020

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Introducción. La selección de genotipos con hábito de crecimiento determinado en tomate, debe contemplar criterios adecuados de selección para incrementar la eficiencia del programa de fitomejoramiento. Objetivo. El objetivo de este trabajo fue estimar criterios de selección para líneas de tomate tipo “chonto” con hábito de crecimiento determinado. Materiales y métodos. Este trabajo se llevó a cabo en la Universidad Nacional de Colombia (Sede Palmira), en el año 2016, con siete líneas con hábito de crecimiento determinado y un testigo con crecimiento indeterminado. Se determinó la heredabilidad en sentido amplio (h2g), coeficiente de variación ambiental, coeficiente de variación genética, eficiencia de la selección y ganancia genética, en parámetros morfológicos, fenológicos, de calidad de fruto, forma de fruto y producción, con el empleo del procedimiento RELM/BLUP, del software SELEGEN. Resultados. Hubo tres rangos de h2g, el primero con valores de h2g mayores a 0,76, el segundo entre 0,53 y 0,38, y el tercero con un valor menor a 0,38. Los mayores valores de h2g fueron para altura final de planta con 0,92, altura de planta al momento de la cosecha con 0,88, producción por planta con 0,83, días a floración con 0,83, número de frutos por planta con 0,82, y días a cosecha con 0,82. Para ganancia genética se encontró que el testigo presentó los mayores valores para, altura final de planta, altura de planta a cosecha, longitud de entrenudo, días a cosecha, duración de cosecha, contenido de sólidos solubles, número de frutos por planta, peso de fruto y producción por planta; sin embargo, en algunos parámetros como altura y fenología para selección por hábito de crecimiento determinado, resultaron mejores los valores más bajos. Conclusión. Se evidenciaron parámetros genéticos que podrían considerarse como criterios de selección para líneas de tomate tipo “chonto” con hábito de crecimiento determinado.

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Growth habit in mini tomato hybrids from a dwarf line

Cited by 6 publications

References 8 publications

Agronomic potential of BC1F2 dwarf round tomato populations

Agronomic potential of BC1F2 dwarf round tomato populations

Selection criteria for tomato lines with defined growth habit

Criterios de selección en líneas de tomate con hábito de crecimiento determinado

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