23 research outputs found
The influence of metabolically engineered glucosinolates profiles in Arabidopsis thaliana on Plutella xylostella preference and performance
The oviposition preference and larval performance of the diamondback moth (DBM), Plutella xylostella, was studied using Arabidopsis thaliana plants with modified glucosinolate (GS) profiles containing novel GSs as a result of the introduction of individual CYP79 genes. The insect parameters were determined in a series of bioassays. The GS content of the plants as well as the number of trichomes were measured. Multivariate analysis was used to determine the possible relationships among insect and plant variables. The novel GSs in the tested lines did not appear to have any unequivocal effect on the DBM. Instead, the plant characteristics that affected larval performance and larval preference did not influence oviposition preference. Trichomes did not affect oviposition, but influenced larval parameters negatively. Although the tested A. thaliana lines had earlier been shown to influence disease resistance, in this study no clear results were found for P. xylostella
Plant species diversity for sustainable management of crop pests and diseases in agroecosystems: a review
Dynamics of diamondback moth oviposition in the presence of a highly preferred non-suitable host
Expression patterns, molecular markers and genetic diversity of insect-susceptible and resistant Barbarea genotypes by comparative transcriptome analysis
Different herbivore responses to two co-occurring chemotypes of the wild crucifer Barbarea vulgaris
Impact of a glossy collard trap crop on diamondback moth adult movement, oviposition, and larval survival
The genome sequence of Barbarea vulgaris facilitates the study of ecological biochemistry
Capacidade reprodutiva e preferência da traça-das-crucíferas para diferentes brassicáceas Reproductive capacity and preference of the diamondback moth feeding on different brassicacea
O objetivo desta pesquisa foi comparar diferentes cultivares de brassicáceas em relação à capacidade reprodutiva e preferência para alimentação e oviposição da traça-das-crucíferas. Os experimentos foram realizados utilizando-se as cultivares de repolho Midori, Chato-de-Quintal, híbridos da Top Seed® - Agristar (TPC 308, TPC 681 e TPC 668), couve-flor Bola de Neve, couve brócolis Ramoso Piracicaba Precoce e couve Manteiga da Geórgia, sendo esta última utilizada como padrão de suscetibilidade. Por meio dos dados biológicos de P. xylostella foram estimados os parâmetros necessários para a construção de tabela de vida de fertilidade, para comparação das cultivares testadas em relação à capacidade reprodutiva da praga. Em gaiolas de criação da traça-das-crucíferas foram colocados quatro quartos de folha, dois a dois, que justapostos formavam um círculo de 8 cm de diâmetro, confrontando-se os materiais dois a dois. As partes foram dispostas equidistantemente, para realização do teste de dupla chance de escolha (preferência para alimentação e oviposição) e de múltipla chance de escolha, confrontando todos os substratos (preferência para alimentação). As cultivares que proporcionaram melhor desenvolvimento e reprodução para a traça-das-crucíferas foram couve Manteiga da Geórgia e couve brócolis. Para preferência alimentar constatou-se alta suscetibilidade em couve Manteiga e TPC 681 e para preferência de oviposição alta preferência para couve-flor Bola de Neve. Com isso, sugere-se a divisão das cultivares estudadas em quatro classes distintas: repolho Midori como moderadamente resistente (MR); couve-flor Bola de Neve e repolho Chato-de-Quintal como suscetíveis (S); couve brócolis, TPC308, TPC681 e TPC668 como moderadamente suscetíveis (MS); e couve Manteiga como altamente suscetível (AS).<br>We compared different cultivars of crucifer in relation to reproductive capacity and preference for feeding and oviposition of the diamondback moth. The experiments were carried out with the following cultivars: Midori and Chato-de-Quintal cabbage, hybrids of cabbage Top Seed® - Agristar (TPC 308, TPC 681 and TPC 668), cauliflower Bola de Neve, broccolis Ramoso Piracicaba Precoce and collard green Manteiga da Geórgia, being this last one used as the susceptible control. Through the biological parameters of P. xylostella we elaborated a fertility life table, Comparing the cultivars in relation to the pest reproductive capacity. Four leaf parts were placed in diamondback moth rearing chambers, being two leaves of the treatment and two of the control which, put together formed a circle with 8 cm in diameter. The parts were disposed in an equidistantly form, to perform the dual-choice test (feeding and oviposition preference) and multiple-choice test, confronting all substrates (feeding preference). The cultivars that provided better development and reproduction for the diamondback moth were collard green Manteiga da Georgia and broccolis Ramoso Piracicaba Precoce. For feeding preference high susceptibility was verified in collard green Manteiga da Geórgia and TPC 681 and for oviposition preference high preference was observed for cauliflower Bola de Neve. Four different groups of cultivars could be formed: cabbage Midori as moderately resistant (MR); cauliflower Bola de Neve and cabbage Chato-de-Quintal as susceptible (S); broccolis, TPC 308, TPC 681 and TPC 668 as moderately susceptible (MS); and collard green as highly susceptible (HS)