Abstract
Drought and salt stress are two major environmental constraints that limit the productivity of agriculture crops worldwide. WRKY transcription factors are the plant-specific transcription factors that regulate several developmental events and stress responses in plants. The WRKY domain is defined by a 60-amino acid conserved sequence named WRKYGQK at N-terminal and a Zinc Finger-like motif at the C-terminal. WRKY genes are known to respond several stresses which may act as negative or positive regulators. The function of most of the WRKY transcription factors from non-model plants remains poorly understood. This investigation shows the expression levels of eight WRKY transcription factor genes from horsegram plant under drought and salt stress conditions. The increase in mRNA transcript levels of WRKY transcription factor genes was found to be high in drought stressed plants compared to salt-stressed plants. The levels of MDA which indicates the lipid peroxidation were less in drought stress. More ROS is produced in salt stress conditions compared to drought. The results show that the expression of WRKY transcription factors in drought stress conditions is reducing the adverse effect of stress on plants. These results also suggest that, during abiotic stress conditions such as drought and salt stress, WRKY transcription factors are regulated at the transcription level.
Highlights
Plants in their natural environmental conditions are always subjected to various biotic and abiotic stresses
The results show that the expression of WRKY transcription factors in drought stress conditions is reducing the adverse effect of stress on plants
These results suggest that, during abiotic stress conditions such as drought and salt stress, WRKY transcription factors are regulated at the transcription level
Summary
Plants in their natural environmental conditions are always subjected to various biotic and abiotic stresses. WRKY TFs are the largest superfamily of TFs specific to plants. They are classified into three groups based on the number of WRKY domains and nature of their zinc-finger motif. Group I contains two WRKY conserved domains and a classical Zinc finger motif. Group II contains single WRKY domain and a classical zinc finger motif. Group III protein of WRKY superfamily contains a single WRKY domain and a modified zinc finger motif C2-CH rather than classical C2-H2. Group II WRKY TFs containing WRKYGQK heptapeptide with Zinc finger CX4-5CX22-23HHX1H is the largest group in most of the plants [6] [7]
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