Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Pearl millet seedlings infected with rust (Puccinia substriata)

ABSTRACT: Transcriptional profiling of rust-infected pearl millet seedlings over time [0h, 20h, 5d and 8d post infection (pi)]. Keywords: Time course, Stress response Loop design. All time points compared with time = 0 h in data analysis. Two biological replicates per sample, and one technical dye swap replicate.

ORGANISM(S): Pennisetum glaucum

SUBMITTER: Ingo Hein

PROVIDER: E-GEOD-13479 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Salicylic acid confers resistance to a biotrophic rust pathogen, Puccinia substriata, in pearl millet (Pennisetum glaucum).

Crampton Bridget G BG Hein Ingo I Berger Dave K DK

Molecular plant pathology 20090301 2

Studies were undertaken to assess the induction of defence response pathways in pearl millet (Pennisetum glaucum) in response to infection with the leaf rust fungus Puccinia substriata. Pretreatment of pearl millet with salicylic acid (SA) conferred resistance to a virulent isolate of the rust fungus, whereas methyl jasmonate (MeJA) did not significantly reduce infection levels. These results suggest that the SA defence pathway is involved in rust resistance. In order to identify pearl millet ge ...[more]

PMID: 19236576

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Project description:Plant growth is the result of cell proliferation in the meristems, which requires a dynamic balance between the formation of new tissue and the maintenance of a set of undifferentiated stem cells. There is much that remains unknown about this vital developmental process. In this study, we have reported the generation of 2735 ESTs from three cDNA libraries derived from dissected garden pea (Pisum sativum cv Torsdag) shoot apical meristems. Clustering analysis of the resulting sequences gave rise to 1686 non-redundant ESTs. The unique sequences generated together with 500 other pea transcripts randomly selected from the GenBank pea protein database have been utilized to construct a 2K oligonucleotide array. Using this pea array, we have obtained the transcript profiles of pea shoot apical meristems in comparison to non-apical-meristem tissues. A total of 181 or 174 transcripts were identified to be significantly up- or down-regulated in the pea shoot apical meristem, respectively. As expected, close to 61% of the transcripts down-regulated in the shoot apical mersitem are those retrieved from the public database, whereas sequences from the same source only made up 12% of the genes that were expressed at higher levels in SAMs. This revelation highlights the under-representation of transcripts from the meristmatic tissues in the current public protein database. Manual inspection of the list of up-regulated transcripts reveals the presence of sequences predicted to encode products associated with cell division and proliferation, epigenetic regulation, auxin-mediated responses and miRNA regulation. Similar genes have been implicated in the regulation of plant stem cell activity. Taken together, our EST collection as well as the microarray data provides useful starting points for more in depth analysis of the meristem function and maintenance. Keywords: shoot apical meristem transcript profiling Total RNA was extracted from dissected SAM (approximately 80 SAMs per extraction) or other plant parts (primary stem, primary roots and mature leaves) using Qiagen RNeasy Mini Kit. Four independent tissue collections and RNA extractions (designated A, B, C and D) were performed for each of the microarray hybridization experiment.The Cy5- or Cy3-labelled cDNA was then hybridized to different sector of the chip according to a balanced block design dual label experiment scheme (Cochran & Cox, 1992): Sector 1: Cy3-SAM A vs Cy5-NM A Sector 2: Cy5-SAM B vs Cy3-NM B Sector 3: Cy3-SAM C vs Cy5-NM C Sector 4: Cy5-SAM D vs Cy3-NM D

Dataset Information

Pearl millet seedlings infected with rust (Puccinia substriata)

Publications

Salicylic acid confers resistance to a biotrophic rust pathogen, Puccinia substriata, in pearl millet (Pennisetum glaucum).

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