Productivity, acylsugar concentrations and resistance to the two-spotted spider mite in genotypes of salad tomatoes

Joicy V M Peixoto,Emmerson R De Moraes,Ana L A Ribeiro,Camila S De Oliveira,Gabriel M Maciel,Rafael R Finzi

doi:10.1590/1807-1929/agriambi.v24n9p596-602

Abstract

ABSTRACT The objective of this study was to characterize genotypes of the salad-type tomato with a determinate growth habit and select genotypes resistant to the two-spotted spider mite for higher productivity and fruit quality. The experiment was conducted at the Horticultural Experimental Station (18°42’43.19” S and 47°29’55.8” W, 873 m altitude) of the Universidade Federal de Uberlândia (UFU), Monte Carmelo campus, from January to June 2018. The experimental design was in randomized blocks containing 16 treatments [12 populations of the F3RC2 generation and four controls: two commercial cultivars (Santa Clara and Rio Grande), the recurrent parent (UFU-057) and the wild species Solanum pennellii (LA-716)] with three repetitions. The accessions UFU-057F3RC210#3.6.1 and UFU-057F3RC213#2.1.2 have high potential for genetic improvement regarding resistance to the two-spotted spider mite. The genotypes UFU-13#4.4.1, UFU-7#4.7.1, UFU-7#4.3.2, UFU-13#2.5.2 and UFU-13#2.1.3 present higher acylsugar concentrations than S. pennellii, in addition to higher productivity and number of fruits per plant. It is suggested to explore combinations between those genotypes previously described with UFU-8#2.4.1 to obtain hybrids with high acylsugar concentrations, two-spotted spider mite resistance, high productivity and increased fruit mass.

Highlights

The two-spotted spider mite (Tetranychus urticae) is a pest that causes significant losses in productivity and quality of tomato fruits (Maciel et al, 2018a,b)
There are few reports of research aimed at obtaining plants with resistance to the two-spotted spider mite in tomato with a determinate growth habit that have a series of phytotechnical advantages as it is not necessary to perform several costly practices, such as: sprouting, harvesting and training systems; as occur in the cultivation of indeterminate cultivars (Maciel et al, 2018a), which can generate significant reductions in production costs and reductions of manpower and mechanization
63% of the analysed genotypes were superior to S. pennellii in their acylsugar concentrations, including Universidade Federal de Uberlândia (UFU)-057F3RC210#3.6.1, UFU-057F3RC27#4.3.2, UFU-057F3RC28#2.4.1, UFU-057F3RC213#4.4.1, UFU-057F3RC27#4.7.1, UFU-057F3RC27#4.3.2, UFU057F3RC213#2.1.1, UFU-057F3RC213#2.5.2, UFU057F3RC213#2.5.1 and UFU-057F3RC213#2.1.3 (Table 1)

Summary

Introduction

The two-spotted spider mite (Tetranychus urticae) is a pest that causes significant losses in productivity and quality of tomato fruits (Maciel et al, 2018a,b). The indiscriminate use of these products can lead to the development of resistance by the pest and contamination of the environment and fruits (Alyokhin et al, 2015). There are few reports of research aimed at obtaining plants with resistance to the two-spotted spider mite in tomato with a determinate growth habit (self-pruning gene) that have a series of phytotechnical advantages as it is not necessary to perform several costly practices, such as: sprouting, harvesting and training systems; as occur in the cultivation of indeterminate cultivars (Maciel et al, 2018a), which can generate significant reductions in production costs and reductions of manpower and mechanization

Objectives

Methods

Results

Conclusion