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Cercospora leaf blight and purple seed stain are caused by Cercospora kikuchii and other Cercospora spp. The fungus can infect leaves and seeds on soybean, and the disease is controlled with fungicides. In Brazil, the intensive use of fungicides on soybean to control other diseases such as soybean rust has exerted resistance selection pressure on all fungal pathogens that attack in the crop. In this study, we evaluated the sensitivity of 56 Cercospora spp. soybean isolates collected during 9 crop seasons in 9 Brazilian states to quinone outside inhibitors (QoI) and methyl benzimidazole carbamate (MBC) fungicides using mycelial growth inhibition in amended media with a discriminatory dose of 10 μg/mL. We also analyzed single polymorphisms in the target genes cytb and β-tubulin using target genotyping by sequencing by Illumina short reads. Genome-local association was used to correlate the point mutations found in the coding sequence with in vitro assays results. For cytb gene, it was observed only the G143A mutation in 73% of the isolates. The mutation G143A was present in 97% of the isolates classified as resistant at least for two QoI fungicides. The mutation E198A was present in 71% of the isolates being significantly associated with the reduction control to MBC fungicides. Cross-resistance was observed into QoI (azoxystrobin, picoxystrobin, and pyraclostrobin) and MBC (carbendazim, and thiophanate-methyl) active ingredients fungicides. About 97% of Cercospora spp. isolates analyzed possessed the double mutations G143A and E198A and resulting in less sensitive to QoI and MBC fungicides, respectively. All isolates showed homozygous variation in the alternative allele in G143A and E198A mutations. Our results suggest that resistance of the Cercospora spp. from soybean to QoI and MBC fungicides has occurred since the 2008 cropping season in Brazil associated with G143A and E198A mutations.

Asian soybean rust, caused by Phakopsora pachyrhizi, is one of the world’s most economically damaging agricultural diseases. Despite P. pachyrhizi’s impact, the exceptional size and complexity of its genome prevented generation of an accurate genome assembly. We simultaneously sequenced three P. pachyrhizi genomes uncovering a genome up to 1.25 Gb comprising two haplotypes with a transposable element (TE) content of ~93%. The proliferation of TEs within the genome occurred in several bursts and correlates with the radiation and speciation of the legumes. We present data of clear de-repression of TEs that mirrors expression of virulence-related candidate effectors. We can see a unique expansion in amino acid metabolism for this fungus. Our data shows that TEs play a dominant role in P. pachyrhizi’s genome and have a key impact on various processes such as host range adaptation, stress responses and genetic plasticity of the genome.

The diversity of Phakopsora pachyrhizi populations has often resulted in the selection of virulent pathotypes following the release of rust-resistant cultivars. Thus, knowledge of the pathogenicity and variability of P. pachyrhizi specie, coupled with an understanding of its biology and host-pathogen interactions, is essential for better comprehension of the evolution and rapid adaption of the pathogen. Such comprehension can be useful for genetic breeding programs and other research areas. Therefore, this study aimed to assess the genetic variability and virulence among P. pachyrhizi mono-uredinial isolates obtained from field samples collected in Brazil during the period from 2007 to 2012 by comparing the sequences of Internal Transcribed Spacer (ITS) regions and AFLP markers and analyzing the responses of differential soybean genotypes. The polymorphisms among the AFLP markers (locally) and ITS sequences (globally) demonstrated the high genetic diversity of this pathogen. Phenotypic analysis revealed the presence of at least 16 different pathotypes present in soybean fields in Brazil. The most effective resistance gene was Rpp5 (PI 200487), followed by Rpp4 (PI 459025) and Rpp2 (230970). This study represents the first report on the virulence and molecular characterization of a collection of P. pachyrhizi mono-uredinial isolates, which might represent different races occurring in Brazilian fields in the period from 2007 to 2012.

Soybean is the second largest source of oil worldwide. Developing soybean varieties with high levels of oleic acid is a primary goal of the soybean breeders and industry. Edible oils containing high level of oleic acid and low level of linoleic acid are considered with higher oxidative stability and can be used as a natural antioxidant in food stability. All developed high oleic acid soybeans carry two alleles, GmFAD2-1A and GmFAD2-1B. However, when planted in cold soil, a possible reduction in seed germination was reported when high seed oleic acid derived from GmFAD2-1 alleles were used. Besides the soybean fatty acid desaturase (GmFAD2-1) subfamily, the GmFAD2-2 subfamily is composed of five members, including GmFAD2-2A, GmFAD2-2B, GmFAD2-2C, GmFAD2-2D, and GmFAD2-2E. Segmental duplication of GmFAD2-1A/GmFAD2-1B, GmFAD2-2A/GmFAD2-2C, GmFAD2-2A/GmFAD2-2D, and GmFAD2-2D/GmFAD2-2C have occurred about 10.65, 27.04, 100.81, and 106.55 Mya, respectively. Using TILLING-by-Sequencing+ technology, we successfully identified 12, 8, 10, 9, and 19 EMS mutants at the GmFAD2-2A, GmFAD2-2B, GmFAD2-2C, GmFAD2-2D, and GmFAD2-2E genes, respectively. Functional analyses of newly identified mutants revealed unprecedented role of the five GmFAD2-2A, GmFAD2-2B, GmFAD2-2C, GmFAD2-2D, and GmFAD2-2E members in controlling the seed oleic acid content. Most importantly, unlike GmFAD2-1 members, subcellular localization revealed that members of the GmFAD2-2 subfamily showed a cytoplasmic localization, which may suggest the presence of an alternative fatty acid desaturase pathway in soybean for converting oleic acid content without substantially altering the traditional plastidial/ER fatty acid production.

DNA methylation has recently emerged as a powerful regulatory mechanism controlling the expression of key regulators of various developmental processes, including nodulation. However, the functional role of DNA methylation in regulating the expression of microRNA (miRNA) genes during the formation and development of nitrogen-fixing nodules remains largely unknown. In this study, we profiled DNA methylation patterns of miRNA genes during nodule formation, development, and early senescence stages in soybean (Glycine max) through the analysis of methylC—seq data. Absolute DNA methylation levels in the CG, CHH, and CHH sequence contexts over the promoter and primary transcript regions of miRNA genes were significantly higher in the nodules compared with the corresponding root tissues at these three distinct nodule developmental stages. We identified a total of 82 differentially methylated miRNAs in the nodules compared with roots. Differential DNA methylation of these 82 miRNAs was detected only in the promoter (69), primary transcript region (3), and both in the promoter and primary transcript regions (10). The large majority of these differentially methylated miRNAs were hypermethylated in nodules compared with the corresponding root tissues and were found mainly in the CHH context and showed stage-specific methylation patterns. Differentially methylated regions in the promoters of 25 miRNAs overlapped with transposable elements, a finding that may explain the vulnerability of miRNAs to DNA methylation changes during nodule development. Gene expression analysis of a set of promoter-differentially methylated miRNAs pointed to a negative association between DNA methylation and miRNA expression. Gene Ontology and pathways analyses indicate that changes in DNA methylation of miRNA genes are reprogrammed and contribute to nodule development through indirect regulation of genes involved in cellular processes and pathways with well-established roles in nodulation.

Background Small heat shock proteins (sHSPs) belong to the class of molecular chaperones that respond to biotic and abiotic stresses in plants. A previous study has showed strong induction of the gene GmHsp22.4 in response to the nematode Meloidogyne javanica in a resistant soybean genotype, while repression in a susceptible one. This study aimed to investigate the functional involvement of this small chaperone in response to M. javanica in Arabidopsis thaliana. First, it was evaluated the activation of the promoter region after the nematode inoculation, and the occurrence of polymorphisms between resistant and susceptible re-sequenced soybean accessions. Then functional analysis using A. thaliana lines overexpressing the soybean GmHsp22.4 gene, and knocked-out mutants were challenged with M. javanica infestation. Results High expression levels of the GFP gene marker in transformed A. thaliana plants revealed that the promoter region of GmHsp22.4 was strongly activated after nematode inoculation. Moreover, the multiplication of the nematode was significantly reduced in plants overexpressing GmHsp22.4 gene in A. thaliana compared to the wild type. Additionally, the multiplication of M. javanica in the A. thaliana mutants was significantly increased mainly in the event athsp22.0–2. This increase was not that evident in the event athsp22.0–1, the one that preserved a portion of the promoter region, including the HSEs in the region around − 83 bp. However, structural analysis at sequence level among soybean resistant and susceptible genotypes did not detect any polymorphisms in the whole gene model. Conclusions The soybean chaperone GmHsp22.4 is involved in the defense response to root-knot nematode M. javanica in A. thaliana. Specifically, the promoter region covering until − 191 from the transcriptional start site (TSS) is necessary to promoter activation after nematode infection in Arabidopsis. No polymorphisms that could explain these differences in the defense response were detected in the GmHsp22.4 gene between resistant and susceptible soybean genotypes. Therefore, further investigation is needed to elucidate the triggering factor of the plant’s defense mechanism, both at the sequence level of the soybean genotypes presenting contrasting reaction to root-knot nematode and by detecting cis-elements that are essential for the activation of the GmHsp22.4 gene promoter.

Nematodes are pathogens of many important crops, including soybean. The main species found in Brazil are root-knot (Meloidogyne spp.), cyst (Heterodera glycines), root lesion (Pratylenchus brachyurus) and reniform (Rotylenculus reniformis) nematodes. Ureases are traditionally known for catalyzing the hydrolysis of urea to ammonia and carbon dioxide. Besides the main function, they present other independent biological roles, including toxic activities against insects, specially Coleoptera and Hemiptera, and fungi. In previous work, the DNA sequence encoding an insecticidal peptide - named Jaburetox - was identified in a Canavalia ensiformes urease gene. The recombinant Jaburetox exhibited toxicity against insects. Subsequently, the DNA sequence corresponding to Jaburetox was identified as part of the soybean Eu4 urease gene, with the resulting peptide named Soyuretox. In the present study, explants of soybean were transformed with Agrobacterium rhizogenes and ‘composite’ plants produced consisting of wild-type shoots and transgenic hairy roots overexpressing Soyuretox. Thereafter soybean plants overexpressing Soyuretox were obtained through bombardment transformation. Due to similarity between nematode and insect digestion mechanisms, we challenged composite and whole-transgenic plants with the nematode Meloidogyne javanica. Hairy roots overexpressing Soyuretox exhibited a significant reduction (48 %; p

The complex of Diaporthe (asexual morph) species occurring on soybean constitutes an important pathogenic group associated with diseases such as pod and stem blight, seed decay and stem canker. Stem canker, caused by Diaporthe aspalathi, has been reported as the most aggressive form of canker and its occurrence has limited soybean crop productivity in the southern United States. The main form of pathogen control is the use of stem canker resistant soybean varieties. In this study, strains of Diaporthe and Phomopsis were isolated from stem and seeds of soybean in different locations in South America during the years 1989–2014. Genomic DNA from 26 isolates were analyzed by PCR-restriction fragment length polymorphism (RFLP) and Amplified Fragment Length Polymorphism (AFLP) techniques, and sequencing of internal transcribed spacer (ITS) regions of ribosomal DNA. The molecular analysis of ITS sequences by alignment with those of ex-type strains deposited in GenBank and morphological characteristics allowed the identification of Phomopsis longicolla, D. phaseolorum var. sojae, D. caulivora and D. aspalathi. An analysis of the pathogenicity of 13 isolates of D. aspalathi inoculated in soybean genotypes carrying different resistance genes to stem canker (Rdm1, Rdm2, Rdm3, Rdm4, Rdm5 and Rdm?) enabled us to identify the occurrence of at least three races of D. aspalathi occurring in Brazil. Among the isolates identified as D. aspalathi, both molecular and phenotypic analyses showed clustering depending on the date of collection and pathogenicity, which revealed the existence of variability of the pathogen.

Asian soybean rust (ASR), caused by the obligate biotrophic fungus Phakopsora pachyrhizi, can cause losses greater than 80%. Despite its economic importance, there is no soybean cultivar with durable ASR resistance. In addition, the P. pachyrhizi genome is not yet available. However, the availability of other rust genomes, as well as the development of sample enrichment strategies and bioinformatics tools, has improved our knowledge of the ASR secretome and its potential effectors. In this context, we used a combination of laser capture microdissection (LCM), RNAseq and a bioinformatics pipeline to identify a total of 36 350 P. pachyrhizi contigs expressed in planta and a predicted secretome of 851 proteins. Some of the predicted secreted proteins had characteristics of candidate effectors: small size, cysteine rich, do not contain PFAM domains (except those associated with pathogenicity) and strongly expressed in planta. A comparative analysis of the predicted secreted proteins present in Pucciniales species identified new members of soybean rust and new Pucciniales- or P. pachyrhizi-specific families (tribes). Members of some families were strongly up-regulated during early infection, starting with initial infection through haustorium formation. Effector candidates selected from two of these families were able to suppress immunity in transient assays, and were localized in the plant cytoplasm and nuclei. These experiments support our bioinformatics predictions and show that these families contain members that have functions consistent with P. pachyrhizi effectors.

Asian soybean rust (ASR) is one of the most destructive diseases affecting soybeans. The causative agent of ASR, the fungus Phakopsora pachyrhizi, presents characteristics that make it difficult to study in vitro, limiting our knowledge of plant-pathogen dynamics. Therefore, this work used leaf lesion laser microdissection associated with deep sequencing to determine the pathogen transcriptome during compatible and incompatible interactions with soybean. The 36,350 generated unisequences provided an overview of the main genes and biological pathways that were active in the fungus during the infection cycle. We also identified the most expressed transcripts, including sequences similar to other fungal virulence and signaling proteins. Enriched P. pachyrhizi transcripts in the resistant (PI561356) soybean genotype were related to extracellular matrix organization and metabolic signaling pathways and, among infection structures, in amino acid metabolism and intracellular transport. Unisequences were further grouped into gene families along predicted sequences from 15 other fungi and oomycetes, including rust fungi, allowing the identification of conserved multigenic families, as well as being specific to P. pachyrhizi. The results revealed important biological processes observed in P. pachyrhizi, contributing with information related to fungal biology and, consequently, a better understanding of ASR.

A 55% transformation efficiency was obtained by our optimized protocol; and we showed that GmELF1 - β and GmELF1 - α are the most stable reference genes for expression analyses under this specific condition. Gene functional analyses are essential to the validation of results obtained from in silico and/or gene-prospecting studies. Genetic transformation methods that yield tissues of transient expression quickly have been of considerable interest to researchers. Agrobacterium rhizogenes-mediated transformation methods, which are employed to generate plants with transformed roots, have proven useful for the study of stress caused by root phytopathogens via gene overexpression and/or silencing. While some protocols have been adapted to soybean plants, transformation efficiencies remain limited; thus, few viable plants are available for performing bioassays. Furthermore, mRNA analyses that employ reverse transcription quantitative polymerase chain reactions (RT-qPCR) require the use of reference genes with stable expression levels across different organs, development steps and treatments. In the present study, an A. rhizogenes-mediated soybean root transformation approach was optimized. The method delivers significantly higher transformation efficiency levels and rates of transformed plant recovery, thus enhancing studies of soybean abiotic conditions or interactions between phytopathogens, such as nematodes. A 55% transformation efficiency was obtained following the addition of an acclimation step that involves hydroponics and different selection processes. The present study also validated the reference genes GmELF1-β and GmELF1-α as the most stable to be used in RT-qPCR analysis in composite plants, mainly under nematode infection.

Myb genes constitute one of the largest transcription factor families in the plant kingdom. Soybean MYB transcription factors have been related to the plant response to biotic stresses. Their involvement in response to Phakopsora pachyrhizi infection has been reported by several transcriptional studies. Due to their apparently highly diverse functions, these genes are promising targets for developing crop varieties resistant to diseases. In the present study, the identification and phylogenetic analysis of the soybean R2R3-MYB (GmMYB) transcription factor family was performed and the expression profiles of these genes under biotic stress were determined. GmMYBs were identified from the soybean genome using bioinformatic tools, and their putative functions were determined based on the phylogenetic tree and classified into subfamilies using guides AtMYBs describing known functions. The transcriptional profiles of GmMYBs upon infection with different pathogen were revealed by in vivo and in silico analyses. Selected target genes potentially involved in disease responses were assessed by RT-qPCR after different times of inoculation with P. pachyrhizi using different genetic backgrounds related to resistance genes (Rpp2 and Rpp5). R2R3-MYB transcription factors related to lignin synthesis and genes responsive to chitin were significantly induced in the resistant genotypes.

Soybean hosts a wide variety of pathogens that cause significant yield losses. The importance of soybean as a major oilseed crop has led to research focused on its interactions with pathogens, such as Soybean mosaic virus, Pseudomonas syringae, Phytophthora sojae, Phakopsora pachyrhizi, and Heterodera glycines. Pioneering work on soybean's interactions with these organisms, which represent the five major pathogen groups (viruses, bacteria, oomycetes, fungi, and nematodes), has contributed to our understanding of the molecular mechanisms underlying virulence and immunity. These mechanisms involve conserved and unique features that validate the need for research in both soybean and homologous model systems. In this review, we discuss identification of effectors and their functions as well as resistance gene–mediated recognition and signaling. We also point out areas in which model systems and recent advances in resources and tools have provided opportunities to gain deeper insights into soybean-pathogen interactions.

Cotton plants (Gossypium hirsutum L.) exhibiting stunting, loss of floral buds, foliage distortion, and thickened nodes were observed in May 2017 in the county of Sapezal, Mato Grosso State, Brazil (13°32′33″S; 58°48′51″W). Samples of leaves and stems in 10-g aliquots were processed using the blender-centrifugal flotation method. Nematodes of the genus Aphelenchoides were extracted at fresh tissue densities of 41 specimens/g. Specimens were collected individually, narcotized in distilled water with light heat, and mounted in temporary slides. Males and females were examined and measured using a compound microscope (Olympus BX 53) coupled with a video image system. Morphological analysis of females indicated a slender body, a labial region slightly wider than the first body annulus, a hexa-radiated labial structure, a stylet 11 µm long, an oval metacorpus with a distinct valve, the excretory pore located at the anterior edge of the nerve ring, the lateral field marked by four incisures, an oval and long spermatheca filled with spermatozoa, a narrow postuterine sac without spermatozoa and shorter than 1/3 of the vulva-anus distance, and a conoid tail with a terminus bearing a mucro with four pointed processes. These morphological characters and those of the males matched those reported in the original description of Aphelenchoides besseyi by Christie (1942) and a revision by Fortuner (1970) and Franklin and Siddiqi (1972). Additional individual A. besseyi specimens from cotton were used for phylogenetic analysis to verify genetic congruence between the sequences of this population of A. besseyi from cotton and those published for other populations of this nematode in Brazil. The genomic DNA extraction and the sequences were obtained for the near full length 225 of the ribosomal small subunit (SSU) and the expansion segment 226 of the large subunit (D2-D3 LSU) according to the protocol of de Jesus et al. (2016). The newly obtained sequences (MH187564 and MH187565) were assembled using BioEdit version 7.2.5 (http://www.mbio.ncsu.edu/bioedit/page2.html). Guide sequences to phylogenetic analysis were from Meyer et al. (2017). Sequence data were aligned using Mega 7.0 (ClustalW algorithm). The ambiguously aligned regions from SSU and LSU alignments were removed to optimize the phylogenetic analysis. For phylogenetic reconstruction, the best fitting model of sequence evolution was determined for each data set separately using the Akaike information criterion in Mega 7.0. The model GTR+G+I (general time reversible + gamma distributed with invariant sites) was selected for both SSU and LSU. Therefore, phylogenetic trees were constructed applying the maximum likelihood method with 100 bootstrap replications. Phylogenetic analysis indicated that the sequence of the cotton population of A. besseyi grouped with those of a population infesting soybean (Favoreto and Meyer 2017; Meyer et al. 2017) and other populations included in the group rice by de Jesus et al. (2016). The ability of A. besseyi to infect cotton was confirmed in two greenhouse experiments. For these experiments, specimens of A. besseyi obtained from field-infected cotton plants were reared on fungal cultures of Fusarium sp. growing in potato dextrose agar in Petri dishes. The reared nematodes were injected at the stem base of individual healthy cotton cultivar TMG 47B2RF seedlings growing in pots at a density of 6,000 specimens per seedling. The same field symptoms were observed in the inoculated seedlings, and a high number of nematodes were recovered. These results fulfill the modified Koch’s postulates. The final nematode densities in the two experiments were 970 and 2,244 specimens per gram of fresh tissue. Field observations in Brazil also indicated that soybeans grown after or before cotton in the same nematode-infested area were damaged by the nematode as well (similar symptoms on soybean aerial tissues with population levels of 70 specimens/g). A. besseyi therefore poses a considerable threat to cotton-soybean cropping systems in Mato Grosso State in Brazil.

Background The Hsp 20 genes are associated with stress caused by HS and other abiotic factors, but have recently been found to be associated with the response to biotic stresses. These genes represent the most abundant class among the HSPs in plants, but little is known about this gene family in soybean. Because of their apparent multifunctionality, these proteins are promising targets for developing crop varieties that are better adapted to biotic and abiotic stresses. Thus, in the present study an in silico identification of GmHsp 20 gene family members was performed, and the genes were characterized and subjected to in vivo expression analysis under biotic and abiotic stresses. Results A search of the available soybean genome databases revealed 51 gene models as potential GmHsp 20 candidates. The 51 GmHsp 20 genes were distributed across a total of 15 subfamilies where a specific predicted secondary structure was identified. Based on in vivo analysis, only 47 soybean Hsp 20 genes were responsive to heat shock stress. Among the GmHsp 20 genes that were potentials HSR, five were also cold-induced, and another five, in addition to one GmAcd gene, were responsive to Meloidogyne javanica infection. Furthermore, one predicted GmHsp 20 was shown to be responsive only to nematode infection; no expression change was detected under other stress conditions. Some of the biotic stress-responsive GmHsp 20 genes exhibited a divergent expression pattern between resistant and susceptible soybean genotypes under M. javanica infection. The putative regulatory elements presenting some conservation level in the GmHsp 20 promoters included HSE, W-box, CAAT box, and TA-rich elements. Some of these putative elements showed a unique occurrence pattern among genes responsive to nematode infection. Conclusions The evolution of Hsp 20 family in soybean genome has most likely involved a total of 23 gene duplications. The obtained expression profiles revealed that the majority of the 51 GmHsp 20 candidates are induced under HT, but other members of this family could also be involved in normal cellular functions, unrelated to HT. Some of the GmHsp 20 genes might be specialized to respond to nematode stress, and the predicted promoter structure of these genes seems to have a particular conserved pattern related to their biological function.

Os metodos aplicados a analise funcional de genes sao de fundamental importância na validacao de resultados obtidos de estudos in silico e/ou da prospeccao genica. Os metodos de transformacao genica para a obtencao de tecidos com expressao transiente e de rapidos resultados sao os de maior interesse. Dessa forma, a transformacao via A. rhizogenes torna-se um metodo extremamente rapido para a obtencao de plantas contendo raizes transformadas, alem de se mostrar eficiente em estudos de superexpressao de genes relacionados a estresses causados por fitopatogenos de raizes. Portanto, o objetivo desse estudo foi aperfeicoar a metodologia de transformacao por Agrobacterium rhizogenes em soja. Os principais pontos foram a elevacao no numero de plantas transformadas e a diminuicao do tempo de conducao do metodo, visando sua aplicacao em estudos envolvendo a interacao da soja com nematoides.

As proteinas MYB figuram como uma das maiores familias de fatores de transcricao (FT) presentes em plantas, nas quais desempenham a regulacao de importantes processos, incluindo a defesa. A classe R2R3-MYB e a mais numerosa entre as plantas e a analise da conservacao do seu dominio MYB e seus motivos (C-terminal) permite agrupa-los em subgrupos. Estudos apontam que R2R3 estao envolvidas no controle de processos especificos, incluindo respostas a estresse biotico. Este trabalho objetivou a identificacao e classificacao filogenetica de R2R3-MYBs de soja, atraves de bioinformatica, bem como a analise de expressao dos FTs. A analise de 1390 sequencias proteicas permitiu a identificacao de 264 R2R3-MYBs, classificados em 42 subgrupos, assim como a atribuicao de funcoes putativas dos mesmos. Analise in silico do perfil de expressao dos MYBs (Genevestigator) demonstrou que eles sao induzidos por infeccao por Phakopsora pachyrhizi, tornando-os interessantes alvos para estudos funcionais futuros em soja. Palavras-chave : GmMYB, motivo, filogenia, P. pachyrhizi , soja

Os nematoides causadores de lesoes radiculares (Pratylenchus sp.) representam um dano grave para a soja e outras culturas agricolas, causando impactos economicos globais. Para identificar genes diferencialmente expressos (GDE) na interacao planta-nematoide, genotipos suscetivel (TGM 115 RR) e resistente (BRSGO Chapadoes) foram inoculados com o nematoide, Pratylenchus brachyurus, e bibliotecas de RNA-seq de raizes inoculadas em quatro diferentes tempos pos-inoculacao foram construidas. Assim, no presente estudo, foi realizada a caracterizacao do transcriptoma de dois genotipos de soja durante a interacao inicial com nematoide da lesao radicular. RNA foi extraido das raizes dos dois genotipos e sequenciado com a plataforma Genome Analyzer. Os reads single-end foram mapeados nos transcritos preditos de soja para a identificacao dos genes expressos. Um total de 1.766 e 2.464 DGE foram identificados nos genotipos resistente e suscetivel, respectivamente. Um numero maior de GDE associados a resposta ao estresse (GO) foi identificado no genotipo resistenteem relacao ao suscetivel, em todos os tratamentos.

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