Agronomic evaluation and combining ability of tomato inbred lines selected for the industrial segment

Abstract

This study carried out agronomic evaluation and estimated the combining ability of tomato lines for the industrial segment, aiming to elect promising genotypes for breeding and to find simple hybrids with superior traits. Randomized-blocks design was used with 57 treatments (45 experimental hybrids, 10 lines and 2 checks treatments) with 3 replications. A complete diallel among 10 tomato lines for processing was used. Evaluated traits were: fruit total (YT) and commercial production (YC), pulp yield (YP), fruit average mass (MM) and total soluble solids content (TSS). Diallel crosses allowed synthesizing experimental hybrids with superior traits when compared to commercial hybrids. Non-additive effects prevailed over the expression of YT, YC, YP and TSS, whereas additive effects prevailed for MM. Lines RVT-08, RVT-05 and RVT-10 are most appropriate for intrapopulational breeding. Experimental hybrids RVT-08 x RVT-09, RVT-07 x RVT-10 and RVT-08 x RVT-10 were pointed as the experimental genotypes with the best performance, surpassing the commercial genotypes for the traits evaluated.

Assessment of 112 tomato (Solanum lycopersicum L.) cultivars for industrial processing in Portoviejo, Ecuador

“…The best industrial tomato cultivars were as follows: UG 10109 with 5°brix, UG 16.609 with 5°brix, and UG 1103913F with 4°brix. These values were however, above the values found for the RVT-08 line studied by Figueiredo et al (2016), who registered the highest value of 4.90°brix in their experiment with industrial tomatoes.…”

“…These results contrast with production values reported by Giordano, Fonseca, Silva, InoueNagata & Boiteux (2005), who recorded 107 t.ha -1 of tomato for industrial purposes. On the other hand, tomato paste yield values assessed in this research were even above the industrial tomato production values reported in India, with an average of 14.16 t.ha -1 and also compared to a world average of 34.70 t.ha -1 (FAOSTAT, 2015) Likewise, Figueiredo et al (2016), on a genetic improvement study carried out for industrial tomatoes in Brazil found that no hybrid exceeds the hybrid test called Tinto, which showed fruit weight of 104.40 g.fruit -1 . However, plant materials used in this study were lower to those shown by cultivar SG 07-632 from Ohio University, with an average of 73.73 g, and lower to cultivar SG 07-627 with 98.18 g (Ohio University).…”

“…Cultivar SG 07-632 had a production of 68.58 t.ha -1 and was ranked in the first place, followed by cultivar SG 07-627 with an average production of 64.40 t.ha -1 and cultivar SG 07-603 with 61.60 t.ha -1 . Figueiredo, Resende, Faria, Paula, Rizzardi & Meert (2016), when carrying out an agronomic evaluation of industrial tomatoes found that the best yields were obtained from hybrids RVT-07 x RVT-10 (77.05 t.ha -1 ) and RVT-02 x RVT-03 (70.65 t.ha -1 ). These results contrast with production values reported by Giordano, Fonseca, Silva, InoueNagata & Boiteux (2005), who recorded 107 t.ha -1 of tomato for industrial purposes.…”

“…Thus, the cultivar UG 10109 produced 13.00 t.ha -1 , cultivar UG 16609 showed a yield of 10.20 t.ha -1 and cultivar UG 1103913F was the lowest yield producing cultivar with only 5.1 t.ha -1 . These production values can be compared with hybrids studied by Figueiredo et al (2016) , which are all placed in the same statistical significance range.…”

Genetic divergence among processing tomato hybrids and formation of new segregating populations

“…However, as a consequence, there has been a low genetic gain obtained with intrapopulational breeding strategies (Gonçalves et al, 2008;Figueiredo et al, 2016a), which have opted for strategies that seek to recombine existing genetic variability in order to form segregating populations of wide genetic variability and to encourage the selection of transgressive genotypes (Figueiredo et al, 2016b).…”