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Expression profiling of hybrid necrosis in triploid hybrids crossed between tetraploid wheat and Aegilops tauschii

ABSTRACT: We have employed whole genome microarray expression profiling as a discovery platform to identify genes to alter the transcript accumulation levels in hybrid necrosis-showing plants, which are triploid hybrids crossed between tetraploid wheat and diploid wheat progenitor Aegilops tauschii. Of the up-regulated genes, defense-related genes were most frequently found, whereas photosythesis-related genes down-regulated in the type I necrosis line. To validate the microarray data, RT-PCR and quantitative RT-PCR analyses for 22 selected genes were performed. Of the examined 15 up-regulated and 7 down-regulated genes, the expression pattern of only one down-regulated gene was inconsistent with the microarray data. Together with cytological analysis of the necrotic tissues, the microarray analysis strongly suggests that an autoimmune response might be triggered by intergenomic incompatibility between the AB and D genomes in type I necrosis, and that genetically programmed cell death could be regarded as a hypersensitive response-like cell death similar to that observed in Arabidopsis intraspecific and Nicotiana interspecific hybrids.

ORGANISM(S): Triticum aestivum

PROVIDER: GSE19613 | GEO | 2009/12/23

SECONDARY ACCESSION(S): PRJNA122453

REPOSITORIES: GEO

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Expression profiling of cold-induced hybrid necrosis in triploid hybrids crossed between tetraploid wheat and Aegilops tauschii.

Project description:We have employed whole genome microarray expression profiling as a discovery platform to identify genes to alter the transcript accumulation levels in cold-induced hybrid necrosis lines, which are triploid hybrids crossed between tetraploid wheat and diploid wheat progenitor Aegilops tauschii. Of the up-regulated genes, defense-related genes were most frequently found in the leaves and shoot apical meristem (SAM) of type II necrosis line with low temperature. On the other hand, cell cycle-related genes were highly down-regulated in SAM of type II necrosis line under low temperature. To validate the microarray data, RT-PCR and quantitative RT-PCR analyses for 37selected genes were performed in total. Of the examined 21 up-regulated and 16 down-regulated genes, more than 75% of expression pattern were consistent with the microarray data. Together with cytological analysis of the necrotic tissues, the microarray analysis strongly suggests that an autoimmune response-like reaction and repression of cell division might be triggered by intergenomic incompatibility between the AB and D genomes in type II necrosis.

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Expression profiling of hybrid necrosis in triploid hybrids crossed between tetraploid wheat and Aegilops tauschii

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2010-05-16 | E-GEOD-19613 | biostudies-arrayexpress

Expression profiling of cold-induced hybrid necrosis in triploid hybrids crossed between tetraploid wheat and Aegilops tauschii.

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