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ABSTRACT: chinese spring (CS) and CS/Th. elongatum octoploid raw 454 sequence reads

PROVIDER: PRJNA281549 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR2083852.fastq.gz	Fastqsanger.gz
	SRR3400832.fastq.gz	Fastqsanger.gz
	SRR3466761.fastq.gz	Fastqsanger.gz
	SRR3466762.fastq.gz	Fastqsanger.gz
	SRR5061910.fastq.gz	Fastqsanger.gz

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Expression profiling of wheat heads from spring wheat Chinese Spring (CS) and CS-7EL (CS with additional chromosome arm 7EL from Thinopyrum elongatum), after inoculation with either water (mock inoculation) or Fusarium graminearum

Project description:The ditelocentric addition line CS-7EL of the spring wheat (Triticum aestivum) cultivar Chinese Spring (CS) contains the long arm of the chromosome 7E from Thinopyrum elongatum (CS-7EL), which confers high resistance to fusarium head blight. It is of great interest to breeders to integrate the resistance locus (loci) from Th. elongatum into commercial wheat varieties. The objectives of this study were to identify candidate genes expressed from the 7EL chromosome of CS-7EL, to develop 7EL-specific molecular markers, and to validate their usefulness to characterize recombination between one of the group 7 chromosomes of wheat and Th. elongatum. High-throughput sequencing of Fusarium graminearum-infected and control CS and CS-7EL cDNA libraries was performed using RNA-Seq. A stepwise bioinformatics strategy was applied to assemble the sequences obtained from RNA-Seq and to create a conservative list of candidate genes expressed from the foreign chromosome 7EL. PCR primer pairs were designed and tested for 135 candidate genes. A total of 48 expressed molecular markers specific for the chromosome 7EL were successfully developed. Screening of progenies from two BC1F2 families from the cross CS-7E(7D)×2*CSph1b showed that these markers are useful to characterize recombination events between the chromosomes 7D from wheat and 7E from Th. elongatum.

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Centromere misdivision promotes centromeric sequence changes, de novo centromere formation, and centromere expansion

Project description:Centromeres typically contain repeat sequences, but centromere function does not necessarily depend on these sequences. In aneuploid wheat (Triticum aestivum) and wheat distant hybridization offspring, we found functional centromeres with dramatic changes to centromeric retrotransposon of wheat (CRW) sequences. CRW sequences were greatly reduced in the ditelosomic lines 1BS, 5DS, 5DL, and a wheat-Thinopyrum elongatum addition line. CRWs were completely lost in the ditelosomic line 4DS, but a 994 kb ectopic genomic DNA sequence was involved in de novo centromere formation on the 4DS chromosome. In addition, two ectopic sequences were incorporated in a de novo centromere in a wheat-Th. intermedium addition line. Centromeric sequences were also expanded to the chromosome arm in wide hybridizations. Stable alien chromosomes with two and three regions containing centromeric sequences were found in wheat-Th. elongatum hybrid derivatives, but only one is functional. In wheat-rye (Secale cereale) hybrids, rye centromere specific sequences spread to the chromosome arm and may cause centromere expansion. Thus, distant wheat hybridizations cause frequent and significant changes to the centromere via centromere misdivision, which may affect retention or loss of alien chromosomes in hybrids. ChIP-seq was carried out with anti-CENH3 antibody using material 4DS and control (Chinese Spring, CS as short).

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Project description:Fusarium head blight (FHB) is a major disease of cereal crops caused by the fungus Fusarium graminearum (Fg). FHB affecting the flowering heads (or spikes). A FHB resistance locus has been identified on the chromosome 7E of the wild wheat relative Thinopyrum elongatum (Th.e.). That chromosome (7E) or a long arm fragment of it (7EL) have been transferred as additions in the wheat background 'Chinese Spring' (CS). The two addition lines are resistant to FHB while 'Chinese Spring' is moderately susceptible to it. The mechanism of resistance is not known. The analysis of this work is published in the Canadian Journal of Plant Pathology (Wang et al, 2010).

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RNA profiling of Fusarium head blight-resistant wheat addition lines containing the Thinopyrum elongatum chromosome 7E

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