Abstract
ABSTRACT One of the major problems in cultivation of tomato is the occurrence of pests and diseases. The objective of the research was to select genotypes from the second generation of the first backcross (F2BC1) between the tomato cultivar for processing S. lycopersicum (cv. Redenção) and the wild access S. habrochaites var. hirsutum (PI-127826), with high levels of zingiberene (ZGB), resistant to the twospotted spider mite Tetranychus urticae (Acari: Tetranychidae). From the F2BC1 population. The ZGB content was quantified and five plants with high zingiberene selected (RVTZ 2011-079-117, RVTZ 2011-079-185, RVTZ 2011-079-335, RVTZ 2011-079-345 and RVTZ 2011-079-503) and four with low zingiberene content (RVTZ 2011-079-417, RVTZ 2011-331-460, RVTZ 2011-079-538 and RVTZ 2011-079-548) were selected. Genotypes selected for high and low ZGB content and the parentals S. habrochaites var. hirsutum access PI-127826 and ‘Redenção’ were evaluated for repellency to the twospotted spider mite. There was a significant and inverse correlation between ZGB content and average distances travelled by mites on tomato leaflets. The genotypes of the F2BC1 generation with high zingiberene levels RVTZ 2011-079-117, RVTZ 2011-079-185, RVTZ 2011-079-335, RVTZ 2011-079-345 and RVTZ 2011-079-503 are promising for progress in achieving resistant lines to arthropod pests. Among them RVTZ 2011-079-117 stands out for resistance to twospotted spider mite.
Highlights
A divergência genética de genótipos de melão do grupo momordica foi estimada, coletados em cinco estados brasileiros, e determinada a contribuição relativa dos caracteres morfológicos avaliados para a variabilidade genética
Group I was formed by 94.74% of the evaluated accessions, only the accession A19 showed the background color of the peel, intensity of the background color of the peel, peel color hue, fruit base shape, fruit apex shape and placental color different from the characters observed in the other accessions of momordica group, with yellow color, dark intensity, orange toned, round-based shape, flat apex, and salmon-colored placenta (Table 2)
The third group included the accessions A20 and A21 belonging to cantaloupensis group, which differed in relation to the placenta color, showing salmon and orange color, respectively (Table 2)
Summary
A divergência genética de genótipos de melão do grupo momordica foi estimada, coletados em cinco estados brasileiros, e determinada a contribuição relativa dos caracteres morfológicos avaliados para a variabilidade genética. Melon (Cucumis melo), belonging to Cucurbitaceae family, is one of the species presenting great genetic variability for several characters, mainly with respect to fruits Due to this fact, some intraspecific classifications of C. melo have been suggested, over time, by Cogniaux & Harms (1924), Pangalo (1933), Filov (1960), Whitaker & Davis (1962), Grebenšcikov (1986), Munger & Robinson (1991) and Pitrat et al (2000) cited by Aragão (2011). One of the most recent classification, and widely used in literature, proposed to divide the species into six botanical groups: cantaloupensis, inodorus, conomon, dudaim, flexuosus and momordica (Robinson & DeckerWalters, 1997). Many of these groups are economically important in developed countries and they were based on their culinary attributes (Staub et al, 2000). These cultivars are adapted to several soil and climatic conditions (Torres Filho et al, 2009) and have been grown over time by family farmers, and can be used as parents in melon breeding programs
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