Independently, both drought adaptation and Xoo resistance have been extensively studied. Though the cross-talk between drought and Xoo stress responses have been explored from individual stress studies, examining the combinatorial stress response is limited in rice. Recently published combined stress studies showed that under the combined stress, maintenance of carbon assimilation is hindered and such response is regulated by overlapping cellular mechanisms that are different from either of the individual stresses. Several receptors, MAP kinases, transcription factors, and ribosomal proteins, are predicted for playing a role in cellular homeostasis and protects cells from combined stress effects. Here we provide a critical analysis of these aspects using information from the recently published combined stress literature. This review is useful for researchers to comprehend combinatorial stress response of rice plants to drought and Xoo.
Figure 1. The molecular responses under drought and Xoo infection in Rice. The stress signals from biotic and abiotic stresses are perceived by specific receptors and cascade of signaling processes such as protien Kinases, TFs, transporters, ribosomal protiens, and many hormone responsive genes are differentially co-regulated in both drought and pathogen stress. The transcriptional regulators which play central role enhances the transcripts of diverse functional genes and ribosomal proteins translate the message in to protein to maintain cellular homeostasis under combined stress Many of these genes were upregulatcd under combined stress have relevance in improving stress adaptation (Narsai et al., 2013; Huang et al., 2014; Zhang et al., 2016).