Genome-wide analysis of the transcriptional response to drought stress in root and leaf of common bean.
Genet Mol Biol 2020;
43:e20180259. [PMID:
31429863 PMCID:
PMC7307723 DOI:
10.1590/1678-4685-gmb-2018-0259]
[Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 02/22/2019] [Indexed: 12/30/2022] Open
Abstract
Genes related to the response to drought stress in leaf and root tissue of
drought-susceptible (DS) and tolerant (DT) genotypes were characterized by
RNA-Seq. In total, 54,750 transcripts, representative of 28,590 genes, were
identified; of these, 1,648 were of high-fidelity (merge of 12 libraries) and
described for the first time in the Andean germplasm. From the 1,239
differentially expressed genes (DEGs), 458 were identified in DT, with a
predominance of genes in categories of oxidative stress, response to stimulus
and kinase activity. Most genes related to oxidation-reduction terms in roots
were early triggered in DT (T75) compared to DS (T150) suggestive of a mechanism
of tolerance by reducing the damage from ROS. Among the KEGG enriched by DEGs
up-regulated in DT leaves, two related to the formation of Sulfur-containing
compounds, which are known for their involvement in tolerance to abiotic
stresses, were common to all treatments. Through qPCR, 88.64% of the DEGs were
validated. A total of 151,283 variants were identified and functional effects
estimated for 85,780. The raw data files were submitted to the NCBI database. A
transcriptome map revealed new genes and isoforms under drought. These results
supports a better understanding of the drought tolerance mechanisms in
beans.
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