ABSTRACT. Obtaining tomato cultivars resistant to pests through interspecific crosses between commercial cultivars and wild accessions is an important tool in integrated pest management. The aim of this study was to select tomato genotypes with high zingiberene (ZGB) levels that are resistant to the South American tomato moth (Tuta absoluta Meyrick) and to estimate genetic parameters of ZGB inheritance from the interspecific cross Solanum lycopersicum cultivar 'Redenção' x Solanum habrochaites var. hirsutum (PI-127826 accession). F 2 plants with different ZGB contents were selected and submitted to a tomato moth resistance test. ZGB content exhibits high broad sense heritability, with incomplete dominance of lower ZGB content. Furthermore, the level of ZGB in leaflets was estimated to be controlled by two genes. These results show that high ZGB levels are effective at conferring resistance to the South American tomato moth.

Strawberry shows genetic variability between cultivars and, environmental elements affect the physicochemical traits of fruits when assessed under different environments. So, assessment of the stability of physicochemical traits is a tool that assists the producer in the choice of the cultivar with higher acceptance in the consumer market. This study aimed to assess the stability of strawberry cultivars based on physicochemical traits of fruits on three environments using the additive main effects with multiplicative interaction (AMMI) analysis. Thirteen strawberry cultivars were assessed in Lavras-MG, Uberlândia-MG, and Guarapuava-PR. The experimental design was in blocks with treatments at random and four replications. The stability of physicochemical traits of fruits (firmness, soluble solids, titratable acidity, soluble solids to titratable acidity ratio, vitamin C, and anthocyanins) was assessed. For the stability and performance of physicochemical traits under the three environments, the cultivars Tudla and Festival stood out for fruit firmness, Albion for soluble solids, Aromas and Tudla for titratable acidity, Sweet Charlie and Palomar for soluble solids to titratable acidity ratio, and Camarosa for vitamin C and anthocyanins.

ABSTRACT The market requirement regarding fruit type varies from region to region and it is necessary to produce cultivars with different patterns of fruit morphology. Therefore, the aim of this study was to select lines with resistance to tomato leafminer and different fruit shapes in order to meet the different market segments. Seventy-six lines and pre-selected populations were used for pest resistance together with four other susceptible controls (TOM-584, TOM-684, NC-123S, and Santa Clara) and two wild accessions (Solanum pennellii ‘LA 716’ and S. habrochaites var. glabratum ‘PI-127826’) considered resistant. The experiment consisted of tests of resistance to the tomato leafminer Tuta absoluta. The selection of lines was efficient, being obtained 33 lines or populations resistant to the tomato leafminer that comprise the market segments of the types of multilocular fruit, Santa Cruz, Saladette or Italian, as well as intermediate standards of fruits.

No abstract

In strawberry the environmental elements affect the characteristics of productivity and physico-chemical quality of the fruits, when evaluated in different environments. To mitigate the effects of genotype x environment interaction, it is necessary to predict adaptability and stability to identify cultivars with predictable performances between environments. In this context, the objective was to estimate the adaptability and stability of strawberry cultivars using the REML / BLUP procedure. The experiments were carried out in different environments in edaphoclimatic aspects, with 13 strawberry cultivars in a randomized block design, with four replications. As they are characteristics of quantitative origin, the number of commercial fruits (NFC) and mass of commercial fruits (MFC) presented low h2mg, the other characteristics presented values of moderate and high magnitudes for h2mg (0.50 to 0.95). There were changes in the cultivar ordering between environments, reflecting the genotypic correlation between environments, which varied between characteristics. The cultivars highlighted in the ordering through genotypic values were also highlighted by the MHPRVG method. The cultivars Albion, Camarosa and Camino Real were the best for most traits by the MHPRVG method, which reveals good adaptability and stability of these cultivars in relation to the evaluated environments. The mixed model methodology was efficient for selecting superior cultivars in the evaluated environments. Of the tested cultivars Albion, Camarosa and Camino Real were the ones that showed greater adaptability and stability by the MHPRVG method for the environments under study.