Project description:We present an atlas of global gene expression covering embryo and seed coat development in lentil, providing insights into the evolution of gene expression in embryogenesis of lentil species.
Project description:Using a cDNA microarray themed on Ascochyta-Pulse interaction resistance response was studied in two lentil varieties, specifically in response to A. lentis inoculation in a highly resistant (ILL7537) and highly susceptible (ILL6002) lentil variety. The experiments were conducted in reference design, where samples from mock-inoculated controls acted as references against post-inoculation samples and the plants were grown using a uniform and standardized experimental system that minimized environmental effects. Robust and high quality data was obtained through the use of three biological replicates (including a dye-swap), the inclusion of negative controls, and stringent selection criteria for differentially expressed genes including a fold change cutoff determined by self-self hybridizations, Students t-test and FDR (Fasle Discovary Rate) multiple testing correction (P<0.05). Microarray observations were validated by quantitative real time RT-PCR using the RNA from one of the bioassay used in the original microarray experiment. Ninety genes were differentially expressed in ILL7537 and 95 genes were differentially expressed in ILL6002. The expression profiles of the two varieties showed substantial difference in type and time of genes that were expressed in response to A. lentis. The resistant variety showed early up-regulation of PR proteins and other defence related genes. The susceptible genotype showed mainly down-regulation of defence related genes. The microarray experiment, the first in lentil, conducted with a small number of genes themed on Asochyta and Pulse interactions was able to identify different components of the defence mechanism by comparing the transcriptional profiles of the susceptible and resistant genotypes. This study will thus form the basis of future experiments to elaborate and corroborate the genomics of lentils defence to A. lentis. Keywords: time course, disease state analysis
Project description:Drought stress is one of the main environmental factors that affects growth and productivity of crop plants, including lentil. To gain insights into the genome-wide transcriptional regulation in lentil root and leaf under short- and long-term drought conditions, we performed RNA-seq on a drought-sensitive lentil cultivar (Lens culinaris Medik. cv. Sultan). After establishing drought conditions, lentil samples were subjected to de novo RNA-seq-based transcriptome analysis. The 207,076 gene transcripts were successfully constructed by de novo assembly from the sequences obtained from root, leaf, and stems. Differentially expressed gene (DEG) analysis on these transcripts indicated that period of drought stress had a greater impact on the transcriptional regulation in lentil root. The numbers of DEGs were 2915 under short-term drought stress while the numbers of DEGs were increased to 18,327 under long-term drought stress condition in the root. Further, Gene Ontology analysis revealed that the following biological processes were differentially regulated in response to long-term drought stress: protein phosphorylation, embryo development seed dormancy, DNA replication, and maintenance of root meristem identity. Additionally, DEGs, which play a role in circadian rhythm and photoreception, were downregulated suggesting that drought stress has a negative effect on the internal oscillators which may have detrimental consequences on plant growth and survival. Collectively, this study provides a detailed comparative transcriptome response of drought-sensitive lentil strain under short- and long-term drought conditions in root and leaf. Our finding suggests that not only the regulation of genes in leaves is important but also genes regulated in roots are important and need to be considered for improving drought tolerance in lentil.
Project description:Chickpea and lentil are two important pulse crops used for human consumption as sources of vegetable protein, rich in amino acids and bioactive compounds. The search for elite cultivars with better architecture has been a demand by farmers of these two crops, which aims to systematize their mechanized planting and harvesting on a large scale. Therefore, the identification of genes associated with the regulation of the branching and architecture of these plants has currently gained great importance. This work aimed to gain insight into transcriptomic changes of two contrasting chickpea and lentil cultivars in terms of branching pattern (little versus highly branched cultivars). In addition, we aimed to identify candidate genes involved in the regulation of shoot branching that could be used as future targets for molecular breeding. The axillary and apical buds of chickpea cultivars Blanco lechoso and FLIP07-318C, and lentil cultivars Castellana and Campisi, considered as little and highly branched, respectively, were harvested.
Project description:au10-10_froid - defenses mechanism in response to cold stress - Role of PI4 kinase and Long-chain bases kinases in response to cold stress - Plantlets of wild type and mutant were grown vitro for 14 days in a growth chamber (80% humidity, 80 micro Enstein without photoperiod). The 15th day, plantlets were transferred at 4°C or 12°C during 4 hours (80 micro Enstein) for the cold stress.
Project description:The cold acclimation process is regulated by many factors like ambient temperature, day length, light intensity, or hormonal status. Experiments with plants grown under different light-quality conditions indicate that the plant response to cold is also a light-quality-dependent process. Here, the role of light quality in the cold response was studied in one-month-old Arabidopsis thaliana (Col‐0) plants exposed for one week to 4 °C at short‐day conditions under white (100 and 20 μmol m‐2s‐1), blue or red (20 μmol m‐2s‐1) light conditions. An upregulated expression of CBF1, an inhibition of photosynthesis, and an increase in membrane damage showed that blue light enhanced the effect of low temperature. Interestingly, cold-treated plants under blue and red light showed only limited freezing tolerance compared to white light cold-treated plants. Next, the specificity of the light quality signal in cold response was evaluated in Arabidopsis accessions originating from different and contrasting latitudes. In all but one Arabidopsis accessions, blue light increased the effect of cold on photosynthetic parameters and electrolyte leakage. This effect was not found for Ws-0, which lacks functional CRY2 protein, indicating its role in the cold response. Proteomics data confirmed significant differences between red and blue light treated plants at low temperature and showed that the cold response is highly accession specific. In general, blue light increased mainly the cold-stress related proteins and red light induced higher expression of chloroplast-related proteins, which correlated with higher photosynthetic parameters in red light cold-treated plants. Altogether, our data suggest that light modulates two distinct mechanisms during the cold treatment - red light driven cell function maintaining program and blue light activated specific cold response. The importance of mutual complementarity of these mechanisms was demonstrated by significantly higher freezing tolerance of cold-treated plants under white light.