Project description:Purpose: To understand the molecular mechanisms involved in disease development during plant-nematode interactions. Methods: We have taken a comprehensive transcriptomic approach to investigate the expression of both tomato and RKN genes in tomato roots at five infection time points from susceptible plants (PR: Pusa Ruby) and two infection time points from resistant plants (M36: Transgenic MM line), grown under soil conditions. Results: Differentially expressed genes during susceptible (1827 tomato, 462 RKN) and resistance (25 tomato, 160 RKN) interactions were identified and a set of genes were validated by qRT-PCR. Conclusion: Our findings, for the first time, provide insights into the transcriptome dynamics of both tomato and RKN during susceptible and resistance interactions and reveal involvement of a complex network of biosynthetic pathways during disease development.
Project description:Comparison of the endogenous small RNA content of tomato leaves and fruits. Size fractionated small RNA from total RNA extracts was ligated to adapters, purified again and reverse transcribed. After PCR amplification the sample was subjected to 454 high throughput pyrosequencing. Please see www.454.com for details of the sequencing technology. Note: Raw data files were not available from 454 at the time this experiment was carried out.
Project description:Post-translational modification of proteins through methylation plays important regulatory role in biological processes. Lysine methylation on histone proteins is known to play important role in chromatin structure and function. However, non-histone protein substrates of this modification remain largely unknown. Herein, we use high resolution mass spectrometry to global screening methylated substrates and lysine- methylation sites in tomato (Solanum Lycopersicum). A total of 241 sites of lysine methylation (mono-, di-, tri-methylation) in 176 proteins with diverse biological functions and subcellular localized were identified in mix tomato with different maturity. Two putative methylation motifs were detected. KEGG pathway category enrichment analysis indicated that methylated proteins are implicated in the regulation of diverse metabolic processes, including arbon fixation in photosynthetic organisms, pentose phosphate pathway, fructose and mannose metabolism, and cysteine and methionine metabolism. Three representative proteins were selected to analyze the effect of methylated modification on protein function. In addition, quantitative RT-PCR further validated the gene expression level of some key methylated proteins during fruit ripening, which are involved in oxidation reduction process, stimulus and stress, energy metabolism, signaling transduction, fruit ripening and senescence. These data represent the first report of methylation proteomic and supply abundant resources for exploring the functions of lysine methylation in tomato and other plants.
