Project description:The present project deals with bark beetle gut total proteome from callow and black bark beetle, Ips typographus. The study aims to identify life stage-specific expression of gut proteins in bark beetles and their functional relevance.
Project description:Seasonal nitrogen (N) storage and reuse is important to the N-use efficiency of temperate deciduous trees. In poplar, bark storage proteins (BSPs) accumulate in protein storage vacuoles of the bark parenchyma and xylem ray cells in the fall. During spring growth, N from stored BSPs is remobilized and utilized by growing shoots. The goal of this study is to investigate global gene expression changes in the bark during BSP remobilization and shoot regrowth under long-day conditions.
Project description:The periderm of trees produces cork cells, whose cell walls are modified with suberin. We compared the transcriptome of outer bark (cork) vs inner bark (control containing secondary phloem and vacular meristem) to infer genes related to suberim metabolism.
Project description:Seasonal nitrogen (N) storage and reuse is important to the N-use efficiency of temperate deciduous trees. In poplar, bark storage proteins (BSPs) accumulate in protein storage vacuoles of the bark parenchyma and xylem ray cells in the fall. During spring growth, N from stored BSPs is remobilized and utilized by growing shoots. The goal of this study is to investigate global gene expression changes in the bark during BSP remobilization and shoot regrowth under long-day conditions. Long-day (LD) grown poplar (Populus trichocarpa, Nisqually-1) plants were transferred to short-day (SD) for 8 weeks at 20°C followed by an addition 12 weeks of SD at 10°C (day) and 4°C (night). Following this treatment plants were then moved to LD and 20°C for 3 weeks for regrowth. Bark samples were collected from plants released from dormancy just prior to transfer to LD and at weekly intervals for 3 weeks after exposure to LD at 20°C.
Project description:The role of bark storage proteins (BSPs) in seasonal N storage and cycling has been well documented. However, the regulatory mechanisms and pathways associated with this physiological process are poorly understood. The objective of this study is to investigate global patterns of gene expression associated with photoperiod regulated BSP accumulation and to identify candidate genes, pathways and regulatory factors governing N storage and cycling in poplar. In this study, differential expression of protease inhibitors, proteases, transcription factors, and other genes coincided with increased BSP gene expression, suggesting a complex regulatory network that might play an important role in BSP accumulation. Bark of Populus trichocarpa (Nisqually-1) was collected at weekly intervals for 6 weeks from plants treated with short-day (SD) photoperiods at 20°C as well as from long-day (LD) grown plants immediately before the SD treatment.
Project description:Illumina HiSeq technology was used to generate mRNA profiles of bark from MIR15 compared to wildtype plants. Wild type (WT) and transgenic poplars (Populus tremula x P. alba, clone INRA 717-1B4) were grown aseptically on Woody Plant Medium. Total RNA was extracted using Tri-Reagent according to the manufacturer’s instructions. Reads of 2X100bp were generated and aligned to Populus trichocarpa v3.0 reference transcripts (http://phytozome.jgi.doe.gov/pz/portal.html#!info?alias=Org_Ptrichocarpa; Ptrichocarpa_210_transcript_primaryTranscriptOnly) using CLC Genomics Workbench 7. mRNA profiles of bark from MIR15 compared to wildtype plants were generated by paired-end (2x100bp) Illumina HiSeq2000 sequencing. Two biological replicates were sequenced for MIR15 and WT samples.