Project description:Viral siRNA generated from antiviral RNA silencing machinery was profiled using small RNA sequencing from Phalaenopsis orchid mixed infected with CymMV and ORSV
Project description:Mycorrhizal fungi colonize orchid seed and induce the germination. This so-called symbiotic germination is a critical developmental process in the lifecycle of all orchids. However, the molecular changes taking place during the orchid seed symbiotic germination still remains largely unknown. To better understand the molecular mechanism of orchid seed germination, we performed comparative transcriptomic and proteomic analysis on Chinese traditional medicinal orchid plants, Dendrobium officinale to explore protein expression change at the different developmental stages between asymbiotic and symbiotic germination and identify the key proteins regulated symbiotic germination of orchid seeds. iTRAQ analysis from 8 samples identified 2256 plant proteins, of which, 308 proteins were differentially expressed across three developmental stages within asymbiotic or symbiotic accession and 229 proteins are differentially expressed in the symbiotic germination compared to asymbiotic germination. 32 proteins are co-upregulated in both proteomic and transcriptomic level for symbiotic germination compared to asymbiotic germination. Our results revealed that symbiotic germination of D. officinale seeds probably shares the common signal pathway with asymbiotic germination during the early germination stage.
Project description:The study of orchid mycorrhizal interactions is particularly complex because of the peculiar life cycle of these plants and their diverse trophic strategies. Here, large-scale transcriptomics has been applied to investigate gene expression in the mycorrhizal roots of the terrestrial mixotrophic orchid Limodorum abortivum under natural conditions. Our results provide new insights into the mechanisms underlying plant-fungus interactions in orchids and in particular on the plant responses to the mycorrhizal symbiont(s) in adult roots. Comparison with gene expression in mycorrhizal roots of another orchid species, Oeceoclades maculata, suggests that amino acids may represent the main nitrogen source in both protocorms and adult orchids, at least for mixotrophic species. The upregulation, in mycorrhizal L. abortivum roots, of some symbiotic molecular marker genes identified in mycorrhizal roots from other orchids as well as in arbuscular mycorrhiza, suggests a common plant core of genes in endomycorrhizal symbioses. Further efforts will be required to understand whether the specificities of orchid mycorrhiza depend on fine-tuned regulation of these common components, or whether specific additional genes are involved.
Project description:We used five different species of Darwins Finches (G. magnirostris, G. conirostris, G. fortis, G. scandens, G. difficilis). G. difficilis was used as a common reference and we polled RNA from 9 unrelated individuals of this species to lower variation. We used at least two unrelated individual embryos from each of the more derived species. We first made cDNA library from the upper beak primordia tissue, which was used to print microarrays. Next, we collected upper beak primordia from stage 26 embryos of 5 species of Darwins Finches that differed in their beak morphology, for making Cy3- and Cy5-labeled probes with the most basal species, the Sharp-beaked Finch, serving as a reference. We then clustered the obtained expression profiles to find transcripts that were expressed in a species- and/or size-specific manner.
Project description:We performed four small RNA sequencing for identification and characterization of microRNAs in Phalaenopsis aphrodite subsp. formosana. By comparing the low temperature-treated group with treated group, we concluded four miRNAs - miR156, miR162, miR528 and miR535 - as low temperature-induced miRNAs. In addition, tissue-specific expression of these miRNAs was investigated. The files contain the miRNAs analysis results in each group. Examination of low temperature-treated leaves and two other organs of Phalaenopsis orchid
Project description:Transcriptional profiling of genes regulated by PaWRKY1 transcription factor A PaWRKY transcription factor from orchid plants is expressed in Arabidopsis, and the PaWRKY-regulated genes are studied
