Abstract
In their natural habitat, the plants face numerous challenges from various plant pathogens simultaneously. In response, they activate the stress-response related machinery through regulation of a complex system of genes, miRNAs, siRNAs, and most importantly, transcriptional factors (TFs). Among the various activated TFs, WRKY TFs superfamily encodes maximum number of regulatory proteins. The WRKY TFs regulate downstream genes by both direct (auto- and cross-regulation) and indirect mechanisms (physical interactions within themselves or other TFs, proteins, and small RNAs). All the WRKY TF members possess a conserved WRKY domain consisting of nearly 60 amino acids with a specific heptapeptide sequence (WRKYGQK), with a Zn2+-finger motif that binds to specific cis-regulatory elements of defense gene called as W-box (TTGAC[C/T]). This W-box has been reported to be contemporary in the genes promoter region related to plants’ innate immunity including PAMP triggered immunity (PTI), effectors triggered immunity (ETI), basal defense, and systemic acquired resistance (SAR). Because of this specific molecular orchestration primarily in plant immunity, this WRKY TFs superfamily has been established as a good target in plant disease management. However, in certain cases, along with beneficial effects, overexpression or repression of various WRKY TFs leads to genetic drag which needs to be identified and eliminated for most advantageous plant growth and development. This chapter will be fully focused on the regulation of the WRKY TFs and its role in plant disease management specifically.
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Rajput, L.S. et al. (2020). Role of WRKY Transcription Factor Superfamily in Plant Disease Management. In: Giri, B., Sharma, M.P. (eds) Plant Stress Biology. Springer, Singapore. https://doi.org/10.1007/978-981-15-9380-2_11
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