Mapeamento do uso de pesticidas para a cultura do milho na bacia hidrográfica do Rio Dourados, MS.

O milho é um dos cereais mais cultivados no Brasil devido, principalmente, ao seu uso na alimentação humana e de animais dosmésticos. Atualmente, o sistema de produção de milho requer o uso de pesticidas que, sem o conhecimento prévio do seu destino no ambiente, pode trazer sérios riscos de contaminação das águas superficiais e subterrâneas, comprometendo, assim, a qualidade da água para as gerações atuais e futuras.bitstream/item/24403/1/COT2006129.pdfDocumento on-line

Pesticidas, agricultura e recursos hídricos.

Comportamento de pesticidas nos solos; Principais processos que governam o destino de pesticidas no solo; Métodos para avaliar o potencial de lixiviação de pesticidas em solos.bitstream/item/38751/1/CT200612.pd

Valores de referência e programa DRIS para avaliação nutricional de soja em Naviraí, MS.

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QTL mapping for brown rot (Monilinia fructigena) resistance in an intraspecific peach (Prunus persica L. Batsch) F1 progeny

Brown rot (BR) caused by Monilinia spp. leads to significant post-harvest losses in stone fruit production, especially peach. Previous genetic analyses in peach progenies suggested that BR resistance segregates as a quantitative trait. In order to uncover genomic regions associated with this trait and identify molecular markers for assisted selection (MAS) in peach, an F1 progeny from the cross "Contender" (C, resistant) 7 "Elegant Lady" (EL, susceptible) was chosen for quantitative trait loci (QTL) analysis. Over two phenotyping seasons, skin (SK) and flesh (FL) artificial infections were performed on fruits using a Monilinia fructigena isolate. For each treatment, infection frequency (if) and average rot diameter (rd) were scored. Significant seasonal and intertrait correlations were found. Maturity date (MD) was significantly correlated with disease impact. Sixty-three simple sequence repeats (SSRs) plus 26 single-nucleotide polymorphism (SNP) markers were used to genotype the C 7 EL population and to construct a linkage map. C 7 EL map included the eight Prunus linkage groups (LG), spanning 572.92 cM, with an average interval distance of 6.9 cM, covering 78.73 % of the peach genome (V1.0). Multiple QTL mapping analysis including MD trait as covariate uncovered three genomic regions associated with BR resistance in the two phenotyping seasons: one containing QTLs for SK resistance traits near M1a (LG C 7 EL-2, R2 = 13.1-31.5 %) and EPPISF032 (LG C 7 EL-4, R2 = 11-14 %) and the others containing QTLs for FL resistance, near markers SNP_IGA_320761 and SNP_IGA_321601 (LG3, R2 = 3.0-11.0 %). These results suggest that in the C 7 EL F1 progeny, skin resistance to fungal penetration and flesh resistance to rot spread are distinguishable mechanisms constituting BR resistance trait, associated with different genomic regions. Discovered QTLs and their associated markers could assist selection of new cultivars with enhanced resistance to Monilinia spp. in fruit

Mapeamento do uso de pesticidas para a cultura da soja na Bacia do Rio Dourados, MS.

bitstream/item/66724/1/N-127-nov.2006.pdfDocumento on-line