Project description:Large scale transcriptomics study to establish gene expression in leaf tissue of W22 inbred line in Zea Mays. RNA was extracted from leaf tissue when the plants were at V6. Sequencing library was produced following the protocol mentioned in the following publication PMID:22039485
Project description:Purpose: The chloroplast DNA has not been primiarly analyzed in rice plants before. Hence, the objective of this study is to analyze and compare the differential methylation of chloroplast DNA in MR219 indica rice across different tissues and different developmental stages. Methods: We prepared a total of nine sodium bisulfite treated DNA libraries from three developing grain tissues, three leaf tissues at ripening stage and three leaf tissues at vegetative stage and sequenced them in Illumina Miseq platform. We performed quality trimming, alignment followed by methylation calling and differential methylation analysis using Trimmomatic v36, Bismark v16.3 and SeqMonk v40.0 on the sequencing data obtained. Statistical analysis was carried out in SeqMonk software and further validated in SPSS statistical software v22.2. Results: With an optimized data analysis workflow, we mapped around average of 26000 reads to chloroplast genome. Differential CpG and CHG methylation in SeqMonk v40.0 revealed that MR219 chloroplast DNA is differentially methylated in grain and leaf tissues and across vegetative stage and ripening stage in the leaf tissues. Chloroplast DNA from leaf at ripening stage was most methylated, followed by grain tissue and lastly leaf tissue from vegetative stage. Conclusions: Overall, it can be concluded that the organellar DNA in MR219 rice are differentially methylated at different tissues and across different developmental stages. The chloroplast DNA was most methylated in the leaf at ripening stage, followed by grain at ripening stage and leaf at vegetative stage. The functional significance of the differential methylation observed in this study needs to be investigated.
Project description:Arabidopsis plants transfer information from the leaf tip to the petiole base to induce adaptive upward leaf movement upon neighbour detection through Far-Red light enrichment in the leaf tip. To determine how a distally derived signal can specifically regulate growth in the abaxial petiole we analysed the transcriptome in the leaf tip and abaxial-adaxially split petiole sections during the first hours of far-red enrichment.
Project description:We used microarray to study the transcriptome response of wheat flag leaves to heat stress (40℃) In order to study the transcriptome response of wheat flag leaf to heat stress, wheat cultivar ‘TAM 107’ plants were subjected to heat stress (40℃). After 1 hour of stress, flag leaves were sampled from both stressed and control plants and were used for microarray analysis.
Project description:An increasing amount of evidence attest that the tea made by albino tea cultivars processes characteristic aroma and taste, which has been considered as a new potential product in the market. Therefore, flavor formation mechanism of albino tea cultivars have drawn exceeding attention from researchers. In this study, transcriptome, metabolomics, and whole-genome bisulfite sequencing (WGBS) were employed to investigate shading effects on leaf color conversion and biosynthesis of three major secondary metabolites in the Albino tea cultivar ‘Yujinxiang’. The increase of leaf chlorophyll level is the major cause of shaded leaf greening from young pale or yellow leaf. Transcriptome analysis showed differentially expressed genes (DEGs) mainly participated in biosynthesis of amino acids, phenylalanine metabolism, phenylalanine, tyrosine and tryptophan biosynthesis, sulfur metabolism, purine metabolism, and pentose and glucuronate interconversions in shading period compared with control group. The result of metabolomics indicated the total catechins level of shading group was significantly decreased than the control; however, the abundance of caffeine was markedly increased, and theanine level was nearly not influenced. Whole-genome DNA methylation analysis revealed that the global genomic DNA methylation patterns of shading period were remarkably altered compared with the control. Furthermore, differentially methylated regions (DMRs) and the DMR-related DEGs between shading and non-shading analysis indicated the DMR-related DEGs were the critical participants in biosynthesis of three major secondary metabolites. To sum up, these findings suggested that the altered levels of DNA methylation may be the main cause for biosynthesis changes of three major secondary metabolites in ‘Yujinxiang’.
Project description:To identify marker genes that are specific for N starvation-induced leaf senescence and suitable to detect cultivar differences at early senescence stages prior to chlorophyll loss, the transcriptomes of leaves of two B. napus cultivars differing in stay-green characteristics and N efficiency were analysed four days after senescence induction by the senescence inducers N starvation, leaf shading and leaf detaching.
Project description:Transcriptional profiling of pear tree comparing a resistant/tolerant cultivar with a susceptible cultivar to the Stemphylium vesicarium fungus Rocha' pear is an economically important portuguese Pyrus communis L. cultivar very susceptible to the Stemphylium vesicarium pathogenic fungus, the brown spot agent, causing huge decrease on fruit quality and yield production. Field control of brown spot disease is based in systemic application of antifungal chemicals with high economic costs and dramatic consequences to public health and environmental pollution. Plant-pathogen interactions involve a series of events encompassing constitutive and induced plant defence responses whose dissection has been a research target for control many crop diseases. The biosynthesis of cell wall polymers and antifungal compounds appear to be an efficient physical and chemical barrier to infection.To understand the molecular responses behind defence mechanisms of resistant/tolerant and susceptible cultivars of Pyrus communis L. to the S. vesicarium fungus, cDNA microarray technology was used to identify the genes differentially expressed along a time course leaf inoculation between 'Rocha' pear cultivar (a high susceptible cultivar) and 'Ercolini' pear cultivar (a resistant/tolerant pear cultivar). This study aims to contribute with information on the molecular mechanisms involved in host-pathogen interactions responsible for pear tree brown spot disease and resistance to Stemphylium vesicarium.
Project description:Tomato seeds (S. lycopersicum ‘Fl Lanai’) were germinated under greenhouse conditions maintained at 24°C-29°C in flat trays (BWI Apopka, Catalog Number GPPF72S7X) filled with Sungro Horticulture soil (Metro-mix 830, BWI Apopka, Cat# TX830). Two weeks post emergence seedlings were transplanted to 4” pots using the same soil and transferred to a Conviron walk-in growth chamber (CMP6060) for the remainder of the experiment. Conviron conditions include a 14h/10h light/dark cycle maintained at 28°C, and plants were fertilized weekly (20-20-20). To prevent cross contamination, tomato plants were confined to insect proof cages at all times (BioQuip 1450NS68). Four weeks after transplanting, 40 whiteflies (B. tabaci MEAM1) were collected from virus free or Tomato Mottle Virus (ToMoV) established colonies via aspiration and moved into a clip cage placed on the 4th true leaf of each tomato plant as previously described38. Whiteflies were reared cabbage (Brassica oleracea), while viruliferous whiteflies were reared on ToMoV infected tomato from colonies established in the Polston lab. For all plants in this study, feeding was halted after 3 days of whitefly feeding (3 DPI) by gentle removal of clip cages and whitefly termination using insecticidal soap (Garden Safe, 1% of potassium salts of fatty acids). For the samples referred to as “local”, the tomato leaf bound within the clip cages was immediately removed and snap frozen for protein extraction. For the samples designated “systemic”, the plants were allowed to continue growing for 7 additional days after clip cage removal and whitefly termination, at which point the 9th leaf was excised and snap frozen. Plants used for collection of local leaves at 3 DPI were not used for the collection of systemic leaves 10 DPI. For both local and systemic leaves collected, we also included a no treatment control (NTC) that was subjected identically to clip cage and insecticidal soap applications, but without the addition of whitefly or ToMoV. Our experiment therefore consists of a no-treatment control (NTC), a whitefly treatment (+WF), and a viruliferous whitefly (+WFV) treatment for both local (4th true leaf, 3 DPI) and systemic leaves (9th true leaf, 10 DPI). The presence of ToMoV in all infected plants was confirmed via Nanopore sequencing. Briefly, Tomato genomic DNA was extracted from five systemic leaf samples using the PureGene tissue DNA isolation kit (product # 158667; QIAGEN, Valencia, CA, USA), following the manufacturer’s protocol and stored at -80°C until needed. Library preparation was performed using the Rapid Sequencing Kit RBK004 protocol (Oxford Nanopore Technologies) and loaded onto a 9.4.1 flow cell in a MinION connected to a MinIT with live base calling enabled. Resulting sequencing reads for each sample were mapped to both ToMoV A component (GenBank accession: L14460) and ToMoV B component (GenBank accession: L14461) sequences.