The objective of this study was to assess the resistance of tomato genotypes with high foliar levels of allelochemicals to the leafminer Liriomyza trifolii. Eight tomato genotypes with contrasting levels of three different alellochemicals were tested for leafminer resistance: the TOM-687 and TOM-688 lines, which are both rich in acylsugar; ZGB-703 and ZGB-704, which are rich in zingiberene; BPX-365G-899-07-04-02 and BPX-367E-238-02, which are rich in 2-tridecanone; and 2 standard commercial hybrids (Deborah Max and Bravo F1) with low-allelochemical content. Thirty days after being transplanted, nine potted plants of each of the treatments were transferred to a phytotron chamber, into which 1600 unsexed leafminer adults from a mass rearing were released. The number of mines and the percentage of leaves and leaflets attacked (= with the presence of punctures) were evaluated. Six days later, the number of pupae was recorded. The genotypes with high levels of acylsugar were associated with higher levels of resistance to leaf miner L. trifolii, through antixenosis and antibiosis mechanisms. At least one of the 2-tridecanone-rich lines (BPX -365G-899-07-04-02) showed some level of resistance via an antibiosis mechanism.
The potyvirus Pepper yellow mosaic virus (PepYMV) is the main virus affecting Brazilian pepper (Capsicum annuum) crops and has become a very important factor affecting pepper production in Brazil (Lucinda, da Rocha, Inoue-Nagata, & Nagata, 2012;Moulin et al., 2014). The first reports of the occurrence of this pathogen in Brazil occurred in 1980 in pepper production fields in the states of São Paulo and Minas Gerais, referring to the potyvirus strain originally classified as PVY M by Nagai (1983). However, in 2001, it was recognized as a new potyvirus species, named Pepper yellow mosaic virus (PepYMV) (Inoue-Nagata et al., 2002).The main method to control PepYMV is through genetic resistance (Bento et al., 2013). Several sources of resistance to this virus have been found in Capsicum spp. and this genetic variability has been allowing to effectively control viral diseases belonging to the potyvirus complex (Nogueira et al., 2012). Despite the wide variability of PepYMV-resistant pepper hybrids commercially available, there are reports of resistance suppression by new strains of PepYMV (Lucinda et al., 2012).The main resistance sources to potyviruses carry one of the genes from pvr series, denominated as pvr1, pvr2, pvr3, Pvr4, pvr5,
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