Project description:Magnaporthe oryzae (rice blast) and the root-knot nematode Meloidogyne graminicola are causing two of the most important pathogenic diseases jeopardizing rice production. Here, we show that root-knot nematode infestation on rice roots leads to important above-ground changes in plant immunity gene expression, which is correlated with significantly enhanced susceptibility to blast disease.
Project description:We compared the gene expression of wild-type Col-0 and a T-DNA mutant SALK_116381C (opr2-1). We either infected or mock-infected the plants with the root knot nematode Meloidogyne incognita and measured the root transcriptome after 0, 1, 4, and 7 days post infection using RNA-seq. The aim of the experiment was to determine whether opr2-1 affected gene expression patterns induced by nematode infection.
Project description:High-coverage whole genome sequencing of 11 Brazilian isolates of the root-knot nematode Meloidogyne incognita, presenting different host plant preferences and different geographical origins. Four M. incognita host races had been proposed in the past, based on host (in)compatibility on four different plant strains. The objective was to assess whether genomic variations (SNP) correlate with host range compatibility, geographical origin and host plant of origin.
Project description:This study employed label-free quantitative mass spectrometry to investigate the proteomic changes in roots of the susceptible rice cultivar Nipponbare during a compatible interaction with the root-knot nematode Meloidogyne graminicola. Root samples were collected at four time points: before inoculation (0 dpi), and at 1, 3, and 7 days post-inoculation (dpi). For time points where galls were visible (3 and 7 dpi), root sections containing galls were specifically collected. Three biological replicates were analyzed for each condition. In total, 6,072 proteins were identified. Comparative analysis between infected and uninfected roots identified 513 proteins uniquely regulated in response to nematode infection. Bioinformatic analyses (GO, KEGG) of these proteins highlighted significant enrichment in defense-related pathways, including phenylpropanoid biosynthesis, glutathione metabolism, and alpha-linolenic acid metabolism. Key downregulated defense-related proteins were further validated, and their corresponding gene expression was analyzed in a resistant rice accession.
