Project description:Upon virus infections, the transcriptomic profile of host plants markedly changes. The rapid and comprehensive transcriptional reprogramming is critical to ward off virus attack. To learn more about transcriptional reprogramming in tobamovirus-infected pepper leaves, we carried out transcriptome-wide RNA-Seq analyses of pepper leaves following Obuda pepper virus (ObPV) and Pepper mild mottle virus (PMMoV)-inoculations.
Project description:In this study, we used the illumina high throughput sequencing approach (Sequencing-By-Synthesis, or SBS) to develop the sequence resource of black pepper. To identify micro RNAs functioning in stress response of the black pepper plant, small RNA libraries were prepared from the leaf and root of Phytophthora capsici infected plants, leaves from drought stressed and control plants.
Project description:Pepper(Capsicum annuum L.) fruit development is a complex and genetically programmed process, a comparative study of transcriptome and proteome changes during two varieties of pepper development(IMG, MG, Br and MR) has been carried out by using RNA-Seq and Lable-free quantitation technology.
Project description:ngs2013_07_pcapsici-effecaps-phytophthora capsici-The analysed RNAseq concerned the oomycete Phytophthora capsici in growth on pepper plants. 1/ How the adaptation of a pathogen to a host depends on its gene expression? 2/ How the plant host impacts the expression of pathogen genes at the very beginning of infection?-Two isolates of Phytophthora capsici were used: the Pc107 isolate (called A for adapted to pepper from INRAE GAFL Avignon), and the Pc273 isolate (N for non-adapted to pepper, collected on pumpkin in the USA). Two accessions of pepper (Capsicum annuum L., the host) were used: Yolo Wonder (YW, PM0031), susceptible (S) to Phytophthora capsici, and Criollo de Morelos 334 (CM334, PM0702), partially resistant (R). Inoculations were performed, as described in Lefebvre and Palloix (1996), by putting on the wounded stem a plug of mycelium. Inoculated plants were transferred to a growth chamber at 24°C/22°C temperature on a 12h/12h light/dark cycle. At 24 hours-post-inoculation, 12 total RNA samples were extracted from inoculated plants for the 4 host-isolate interactions: R_A, S_A, R_N and S_N. Each sample consisted of six pooled stem fragments. The stem fragments are the 5-mm region immediately under the visible stem necrosis. Samples were flash-frozen in liquid-nitrogen and stored at -80ºC. They were ground in liquid nitrogen with a cold mortar and pestle. Total RNA was extracted using QIAGEN Rneasy Plant Mini Kit. RNA-seq libraries were constructed at IPS2 POPS platform (France) by TruSeq_Stranded_mRNA_SamplePrep_Guide_15031047_D protocol (Illumina®, California, USA). Sequencing was conducted on an Illumina Hiseq2000 hosted by Genoscope (Evry, France). The RNA-seq samples have been sequenced in paired-end (PE) with a sizing of 260 bp and a read length of 100 bases, lane repartition and barcoding giving approximately 35 million of paired-end reads per sample.
Project description:A comparative study to determine the pepper leaf curl virus resistance machanism between resistant and susceptible genotypes at three leaf stage. To study the molecular mechanism of pepper leaf curl virus (PepLCV) resistance, pepper plants were exposed to PepLCV through artificial inoculation and hybridization on Agilent tomato microarrays. The expression analysis of PepLCV resistant and susceptible genotypes after artificial inoculation at three leaf stage showed that the resistance against PepLCV is due to sum of expression of hundreds of genes at a particular stage.
Project description:Background: MicroRNAs (miRNAs) play roles in various biological processes including growth, development, and defense in plants. Recent studies revealed that some plant miRNAs could produce secondary small interfering RNAs (siRNAs) such as phased, secondary siRNAs (phasiRNAs) and they regulate cascade of gene expression. Results: We performed genome-wide comparative analysis of miRNAs and their targets in Solanaceae plants in an evolutionary perspective. miRNAs were mapped onto 12 chromosomes and microsynteny analysis, based on miRNAs and their flanking genes, revealed about 86% of conserved miRNAs in pepper maintained synteny with those of tomato or potato. Degradome analysis revealed that many of genes related to transcription or defense response are regulated by miRNAs in Solanaceae plants. We found several miRNAs in pepper targeting a number of genes encoding nucleotide-binding and leucine rich repeat (NLR) or receptor-like protein (RLP), known as major players in defense responses. In addition, resistance-related miRNAs trigger phasiRNA production indicating amplification of regulation of the disease-resistant gene families. Among them, specifically evolved miRNAs in pepper, can-miR-n033a and can-miR-n026, targets many NLRs and RLPs in an expanded subgroup in pepper, respectively. Conclusions: Taken together, miRNAs might be generated and evolved to regulate diverse genes involved in plant immunity in Solanaceae. This study provides an insight into possible co-evolution between resistance-related miRNAs and defense genes in pepper.
Project description:The experiments were performed to elucidate the enigmatic enzymatic formation of the pungent principle, piperine, from black pepper (Piper nigrum L.), the world´s most popular spice. Based a differential RNA-Seq approach including immature fruits, flowers, and leaves, the gene encoding piperine synthase, encoding a BAHD-type acyltransferase and several other candidate genes encoding various enzymatic functions in the biosynthetic pathway were identified. Recombinant piperine synthase and additional promiscuous piperamide synthases were used to facilitate the microbial production of a broad range of medicinally relevant piperamides. Subsequent investigations will also include the identification of enzymatic steps in the phenylpropanoid pathway and the amino acid derived biosynthesis of piperidine Based on the assumption that piperine encoding genes are highly expressed shortly before the slope of piperine accumulation reaches its maximum, RNA from greenhouse grown black pepper plants was extracted from young fruits at two different stages of development, flowers, and leaves were harvested for a differential RNA-Seq approach. Candidate transcripts associated with piperine biosynthesis were identified by comparative transcript abundance and sequence annotation tools.
Project description:A comparative study to determine the pepper leaf curl virus resistance machanism between resistant and susceptible genotypes at three leaf stage. To study the molecular mechanism of pepper leaf curl virus (PepLCV) resistance, pepper plants were exposed to PepLCV through artificial inoculation and hybridization on Agilent tomato microarrays. The expression analysis of PepLCV resistant and susceptible genotypes after artificial inoculation at three leaf stage showed that the resistance against PepLCV is due to sum of expression of hundreds of genes at a particular stage. Tomato microarrays consisting of 43,803 probes were used for whole genome expression analysis of chilli peppers for resistance against PepLCV. Transcripts from the leaves of resistant (BS-35) and susceptible plants (IVPBC-535) were compared in response to PepLCV inoculation at three leaf stage.
Project description:Seven different Solanaceae species, Potato (Solanum tuberosum), Tomato (Solanum lycopersicum), Eggplant (Solanum melongena), Pepper (Capsicum annuum), Tobacco (Nicotiana tabacum), Petunia and Nicotiana benthamiana were subjected to heat stress. Plants were grown for 4-6 weeks at 25 C after which heat stress was initiated by exposing the plants to 35 C for 6, 12, 24, 48 and 96 hours. Control samples were isolated from plants just before initiating the heat stress. RNA was isolated using Qiagen RNeasy. Keywords: Direct comparison
Project description:Seven different Solanaceae species, Potato (Solanum tubersosum), Tomato (Lycopersicum esculentum), Eggplant (Solanum melangena), Pepper (Capsicum annuum), Tobacco (Nicotiana tabacum), Petunia and Nicotiana benthamiana were subjected to cold stress. Plants were grown at 25 C for 4-6 weeks after wich cold stress was initiated by exposing the plants to 4 C for 4, 8, 12, 24 and 48 hours. Control samples were isolated from plants just before the cold stress was initated. RNA was isolated using Qiagen RNeasy. Keywords: Direct comparison