RNA-Seq and Gene Network Analysis Uncover Activation of an ABA-Dependent Signalosome During the Cork Oak Root Response to Drought

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Magalhaes, AP (Author) Other; Verde, N (Author) Other; Reis, F (Author) Other; Martins, I (Author) Other; Costa, D (Author) Other; Lino Neto, T (Author) Other; Castro, PH (Author) Other; Tavares, RM (Author) Other; Azevedo, H (Author) FCUP

Journal

Title: Frontiers in Plant Science

Vol. 6

ISSN: 1664-462X

Publisher: Frontiers Media

Indexing

ISI Web of Knowledge - 29 Citations

Scopus - 30 Citations

Other information

Authenticus ID: P-00K-50A

DOI: 10.3389/fpls.2015.01195

Abstract (EN): Quercus suber (cork oak) is a West Mediterranean species of key economic interest, being extensively explored for its ability to generate cork. Like other Mediterranean plants, Q. suber is significantly threatened by climatic changes, imposing the need to quickly understand its physiological and molecular adaptability to drought stress imposition. In the present report, we uncovered the differential transcriptome of Q. suber roots exposed to long-term drought, using an RNA-Seq approach. 454-sequencing reads were used to de novo assemble a reference transcriptome, and mapping of reads allowed the identification of 546 differentially expressed unigenes. These were enriched in both effector genes (e.g., LEA, chaperones, transporters) as well as regulatory genes, including transcription factors (TFs) belonging to various different classes, and genes associated with protein turnover. To further extend functional characterization, we identified the orthologs of differentially expressed unigenes in the model species Arabidopsis thaliana, which then allowed us to perform in silica functional inference, including gene network analysis for protein function, protein subcellular localization and gene co-expression, and in silica enrichment analysis for TFs and cis-elements. Results indicated the existence of extensive transcriptional regulatory events, including activation of ABA-responsive genes and ABF-dependent signaling. We were then able to establish that a core ABA-signaling pathway involving PP2C-SnRK2-ABF components was induced in stressed Q. suber roots, identifying a key mechanism in this species' response to drought.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17