Project description:Purpose: The goal of this experiment was to use RNA-seq to compare the two commercial cotton species Gossypium hirsutum and Gossypium barbadense and determine what transcripts may account for the better fiber quality in the latter. Methods: RNA was extracted from Gossypium barbadense or Gossypium hirsutum fibers at 10, 15, 18, 21, and 28 days post anthesis. Paired-end, 100-bp RNA-seq was performed on an Illumina HiSeq2000 and the reads were mapped to the Gossypium raimondii genome at www.phytozome.net and non-homologous contig assemblies from Gossypium arboreum. Results from RNA-seq were combined with non-targeted metabolomics. Results: Approximately 38,000 transcripts were expressed (RPKM>2) in each fiber type and approximately 2,000 of these transcripts were differentially expressed in a cross-species comparison at each timepoint. Enriched Gene Ontology biological processes in differentially expressed transcripts suggested that Gh fibers were more stressed. Conclusions: Both metabolomic and transcriptomic data suggest that better mechanisms for managing reactive oxygen species contribute to the increased fiber length in Gossypium barbadense. This appears to result from enhanced ascorbate biosynthesis via gulono-1,4-lactone oxidase and ascorbate recycling via dehydroascorbate reductase. See Bioproject PRJNA263926 and SRA accession SRP049330 for study design and raw sequencing data and Bioproject PRJNA269608 and TSA accession GBYK00000000 for Gossypium arboreum assembled contig sequences used for transcriptome mapping - Cotton fiber mRNA from 10,15,18,21 and 28 day post anthesis fiber from either Gossypium hirusutm or Gossypium barbadense was sequenced and differential gene expression analysis was conducted between species for each timepoint and between adjacent timepoints. Each timepoint was representative of fiber from 9 individual plants processed as 3 biological replicate pools (material from 3 individual plants per pool).

2015-06-26 | E-GEOD-64958 | biostudies-arrayexpress

Transcription profiling of One month old Gossypium herbaceum plant leaf during drought and watered condition

Project description:Comparative genomics has emerged as a promising means of unravelling the molecular networks underlying complex traits such as drought tolerance.We used Affymetrix microarray to detail the global programme of gene expression underlying in drought and watered condition and identified distinct classes of up-regulated genes during this process.leaf tissue were used for the expression analysis during watered and drought condition with three biological replicates for each case. Here we assess the genotype-dependent component of the drought-induced transcriptome response in two contrasting cotton (Gossypium spp) genotypes differing in drought tolerance. Leaf tissue were used during drought and watered condtion for RNA extraction and hybridization on Affymetrix microarrays. We sought to obtain differential expression pattern during drought and wtered condition.

2011-01-11 | E-GEOD-26522 | biostudies-arrayexpress