Abstract
Plant basic leucine zipper (bZIP) proteins play an essential role in the genes expression and regulation in higher plants. They have been shown to regulate diverse plant specific phenomena, including germination, floral induction and development, seed maturation, photomorphogenesis, biotic and abiotic stresses. Resistance response mediated by the rice blast resistance gene Pi36 is a typical signal transduction, in which 12 OsbZIP genes were differentially expressed by microarray analyses. To understand the potential function of OsbZIP genes during the defense responses against rice blast, the expression analysis of these OsbZIP genes, in response to the blast fungus inoculation and the related defense signal molecules induction, were further conducted using real-time fluorescent quantitative polymerase chain reaction (PCR) technique. Our data indicates that among the 12 OsbZIP genes, the expression level eight tested genes were differentially regulated and maintained to 96 h points post inoculation in rice resistant and susceptible cultivars during Magnaporthe oryzae infection, and all of them were also significantly up-regulated by one or several kinds of exogenous plant hormones stresses. Although, these genes were induced only at early time points (1 to 24 h); it is evident that the OsbZIP genes may be involved in different signaling pathway, and play potential important functions in the defense response to rice blast. Key words: OsbZIP transcription factors, rice blast, resistance response, plant hormones stresses.
Highlights
The plant defense responses is regulated via a network of signaling pathway involving salicylic acid (SA), abscisic acid (ABA), jasmonate (JA) and ethylene (ET)
The plant basic leucine-zipper proteins compose a large family of transcriptional regulators exclusively in eukaryotes, which shared two common structures: a DNA-bonding basic region and the Leu zipper dimerization (Nijhawan et al, 2007). basic leucine zipper (bZIP) proteins play an essential role in the genes expression and regulation in higher plants, which have been shown to regulate diverse plant-specific phenomena, including photomorphogenesis and light signaling (Jakoby et al, 2002), defense response against pathogens (Zhang et al, 2003; Kesarwani et al, 2007; Thurow et al, 2005) as well as ABA and/or stress signaling (Lu et al, 2009; Xiang et al, 2008)
12 OsbZIP possible differentially expressed by microarray analyses involved in resistance response Pi36-mediated were analyzed by two induction patterns, such as M. oryzae infection and exogenous hormones induction
Summary
The plant defense responses is regulated via a network of signaling pathway involving salicylic acid (SA), abscisic acid (ABA), jasmonate (JA) and ethylene (ET). # These authors contributed to this work protein becomes a activated form and involved in JA, SA, ABA and other signal transduction pathways, forming a regulation of gene expression networks. As a model species of monocotyledonous plants, about 100 bZIP sequences were predicted in rice database, and 89 of them take different roles in rice stress response and plant hormone signal transduction, 16 of those function have been identified (Nijhawan et al, 2007; Lu et al, 2009; Zou et al, 2008)
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