Abstract
Few dwarf lines of mini-tomatoes with high Brix values are available for direct use in breeding. Therefore, little is known about the mini-tomatoes hybrids obtained from one dwarf parent, as well as the growth habit when the hybrids are obtained by the crossing of dwarf lines versus normal lines with different growth habits. The objective of this study was to evaluate the type of genetic segregation that occurs when crossing a mini-tomato dwarf line versus normal phenotype lines with indeterminate, determined and semi-determinate growth habit. The plants were grown in the field, which phenotypic measures of growth habit were determined from a cross between a dwarf line with normal lines of different growth habits [determinate, semi-determinate and indeterminate]. These crosses were then used to study inheritance. Confirmation of parent homozygosity (P 1 and P 2 ) and growth habit proportions of F 1 , F 2 , F 1 RC 1 (P 1 ) and F 1 RC 1 (P 2 ), were classified after checking the expected and observed frequencies using the χ² test (F= 0.05). Was concluded that, regardless of the parent growth habit, the hybrids always will show indeterminate growth when they are crossed with the mini-tomato dwarf line of this study. This result stimulates the development of more studies concerning hybrids from dwarf lines, in order to evaluate their agronomic potential.
Highlights
The tomato (Solanum lycopersicum L.) is one of the vegetables most economically important in the world
Was concluded that, when the determined and semi-determined growth habits are used as parents to produce hybrids, in F2 population growth habits shows 3:1 type segregation
When the determined and semi-determined growth habits are used as parents to produce hybrids, in F2 population growth habits shows 3:1 type segregation, indicating that inheritance is controlled by a gene with two alleles, with one allele dominant over the other
Summary
The tomato (Solanum lycopersicum L.) is one of the vegetables most economically important in the world. Among the types of tomatoes, minitomatoes stand out from the rest because of their smaller fruit and sweeter taste This type of tomato is distinguished by the higher margins it commands in the market (ABRAHÃO et al, 2014; MACIEL et al, 2016), encouraging growers and seed companies to invest in the vegetable. In this context, breeding programs have sought to develop new technologies, such as several formats and minitomato colors fruits, as well as hybrids with different growth habits. Semideterminate growth has an ideal balance between vegetative and reproductive development, having high productivity and high content of soluble solids in the fruits (VICENTE et al, 2015)
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