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Keywords
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abiotic stress, CO2 fixation, functional genomic, gene discovery, gene ontology, Oryza
sativa L., process, up-regulation.
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Abstract
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Although there are various studies attempted to clarify the genetic mechanism of plant response to
drought stress that reduces crop yield, a meta-analysis can integrate the results of them to provide a
better picture of the issue. Therefore, in this study, several microarray datasets of rice were meta-
analysed under drought stress and normal condition using the R packages. Accordingly, differentially
expressed genes (meta-DEGs) were identified. The results showed 643 and 677 upregulated and
downregulated genes, respectively. The significant common Gene Ontology (GO) terms between
the up- and downregulated genes were responses to abiotic stimulus, water deprivation, oxygen-
containing compound and abscisic acid. The transcription factors (TF) survey showed that bHLH
under drought stress activates up genes 42% more than down genes while bzip Homeodomain
activates down genes 54% more than up genes. The hub downregulated genes obtained from
this study were mainly related to photosynthesis and the hub upregulated genes were mainly
related to stress tolerance which include heat shock proteins (HSPs), late embryogenesis
abundant (LEAs), calmodulin-like protein (CML), phosphatase 2C (PP2Cs) and IAA genes.
Moreover, this meta-analysis data were compared with other experimental data and the results
confirmed the up and down expression of them. Our findings can provide novel insights into
the molecular mechanism of rice (Oryza sativa L.) response to drought stress.
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