Project description:We report transcripts from tomato:tomato and pepper:pepper self-grafts, and tomato:pepper and pepper:tomato hetergrafts over 4 time points: 24 hours after grafting, 3 days after grafting, 5 day after grafting, and 2 weeks after grafting Examination of 4 graft combinations over 4 time points
Project description:Graft compatibility is the ability of two plants to form cohesive vascular connections. Tomato and pepper grafts are incompatible but the underlying causes of this phenomenon remain unknown. We utilzied a broad array of techniques to profile graft compatibility including viability, biophysical stability, and growth. Cell death in the junction was quantified using trypan blue and TUNNEL assays. Transcriptomic analysis of cell death in the junction was preformed using RNA-sequncing. Finally a meta-transcriptomic analysis was conducted with published datasets to further explore the genetic signature of graft incompatibility.We found that all varieties of pepper tested across two species were incompatible with tomato. Tomato and pepper graft incompatibility is characterized by stem instability, reduced growth, and persistent cell death in the graft junction. We showed that tomato and pepper heterografts have prolonger transcriptional activity, with defense processes highly enrched. We identfied a large subset of NLRs and genes involved in programmed cell death which were upregulated in incompatible tissue. We also identified a set of genes with orthologs in both tomato and pepper which are upregulated in incompatible grafts including biosythesis of steroidal glycoalkaloids. Finally we utilized various biological stressors to explore the genetic signature of grafting. We found a significant overlap in the genetic profile of grafting and plant parsitism. We also identified over 1000 genes uniquely upregulated in incompatible grafting including genes in involved in DNA-damage repair. Based on the broad upregulation of NLRs and genes involved with programmed cell death, prolonged cell death in the junction, and DNA damage, we have determined that tomato and pepper graft incompatibility is likely caused by a form of genetic incompatibility which triggers an autoimmune-like response.
Project description:To investigate graft conferred resistance against viral diseases a novel hetero-grafting system was developed using Nicotiana benthamiana scions grafted onto different tomato rootstocks. RNAseq analysis was used to identify mobile tomato mRNAs within N. benthamiana scions
Project description:To investigate the function of SlNOR-like1 in the regulation of cuticle formation in tomato fruits, we established nor-like1 mutants by CRISPR/Cas9. We then performed gene expression profiling analysis using data obtained from RNA-seq of tomato exocarp of wild type (WT) and nor-like1 mutant at mature green (MG) stage.