Abstract
ABSTRACT Tomato cultivars resistant to arthropod pests are an important tool to reduce the use of pesticides. Resistance sources can be found in wild Solanum species such as S. habrochaites, which shows high levels of zingiberene (ZGB). This study aimed to evaluate the resistance of a tomato F2 progeny to spider mite and whitefly by evaluating the ZGB content, in laboratory, in plants from the F2 population of the interspecific crossing Solanum lycopersicum cultivar Redenção x Solanum habrochaites var. hirsutum (PI-127826), F1 plants, susceptible plants (cultivar Redenção) and plants of the wild species (PI-127826). From the F2 population, six plants with high content and three with low content of ZGB were selected. For evaluating the impact of ZGB on the spider mite behavior, the distance walked by spider mites from a central point was measured on the selected plants and their parents. For whitefly, the number of eggs and nymphs were quantified. Spider mites travelled shorter distances in plants with high ZGB content. Also, the number of whitefly eggs and nymphs was lower in these plants. Higher ZBG contents affected negatively both the spider mite and the whitefly behavior.
Highlights
Tomato cultivars resistant to arthropod pests are an important tool to reduce the use of pesticides
In experiment 2, in which the authors evaluated the resistance to spider mite, selected plants showed significant and negative correlation between the distance traveled by mites in 20, 40 and 60 minutes, and ZGB content quantified in leaflets
This fact shows that as ZGB content in the leaflets increases, the average distance traveled by spider mite decreases (Table 1)
Summary
Tomato cultivars resistant to arthropod pests are an important tool to reduce the use of pesticides. This study aimed to evaluate the resistance of a tomato F2 progeny to spider mite and whitefly by evaluating the ZGB content, in laboratory, in plants from the F2 population of the interspecific crossing Solanum lycopersicum cultivar Redenção x Solanum habrochaites var. Spider mites travelled shorter distances in plants with high ZGB content. Com o objetivo de avaliar a resistência ao ácaro-rajado e à mosca-branca em progênies F2 de tomateiro, foi quantificado o teor de ZGB em laboratório, em plantas da população F2 obtidas a partir do cruzamento interespecífico de Solanum lycopersicum cultivar Redenção x Solanum habrochaites var. The increase of consumption requires a corresponding increase of production but pests have led to lower-thanexpected productivity, maintaining the high levels of tomato-derived products imports in Brazil (Nascimento et al, 2013).
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