Rice WNK1 is regulated by abiotic stress and involved in internal circadian rhythm

Kumar, Kundan; Rao, K. Prabhakara; Biswas, Dipul Kumar; Sinha, Alok

doi:10.4161/psb.6.3.13063

Cited by 46 publications

(30 citation statements)

References 22 publications

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“…They have also been implicated in various plant stress responses [ 50 – 52 ]. In SJ, there was also three additional protein kinases (STE, TMK1 and CrRLK1L) activated, which have previously been shown to be involved in protein phosphorylation, signal transduction and abiotic stress responses [ 49 , 53 – 55 ].…”

Section: Results and Analysismentioning

confidence: 99%

“…Regarding JM, on the other hand, there was a xyloglucan endotransglucosylase/hydrolase (GH) that was highly induced and which has previously been shown to participate in cell wall loosening and in the protection of the cell against dehydration [ 61 , 62 ]. There was also a phosphate permease (PHP) previously shown to transport inorganic P and that might be coupled to P deprivation stress during cold stress [ 41 , 63 ], a serine/threonine/tyrosine protein kinase (STE), which is coupled to phosphorylation and signal transduction during abiotic stress [ 49 , 53 – 55 ] and a glutathione S-transferase (GTR), which possibly participates in oxidation reduction and detoxification of toxic substrates that accumulates during abiotic stress [ 64 ].…”

Section: Results and Analysismentioning

confidence: 99%

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Comparative Transcriptomics of Sijung and Jumli Marshi Rice during Early Chilling Stress Imply Multiple Protective Mechanisms

et al. 2015

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IntroductionLow temperature is one of the major environmental factors that adversely affect plant growth and yield. Many cereal crops from tropical regions, such as rice, are chilling sensitive and, therefore, are affected already at <10°C. Interestingly, it has been demonstrated that chilling susceptibility varies greatly among rice varieties, which indicates differences in the underlying molecular responses. Understanding these differences is vital for continued development of rational breeding and transgenic strategies for more tolerant varieties. Thus, in this study, we conducted a comparative global gene expression profiling analysis of the chilling tolerant varieties Sijung and Jumli Marshi (spp. Japonica) during early chilling stress (<24 h, 10°C).Methods and ResultsGlobal gene expression experiments were conducted with Agilent Rice Gene Expression Microarray 4x44K. The analysed results showed that there was a relatively low (percentage or number) overlap in differentially expressed genes in the two varieties and that substantially more genes were up-regulated in Jumli Marshi than in Sijung but the number of down-regulated genes were higher in Sijung. In broad GO annotation terms, the activated response pathways in Sijung and Jumli Marshi were coherent, as a majority of the genes belonged to the catalytic, transcription regulator or transporter activity categories. However, a more detailed analysis revealed essential differences. For example, in Sijung, activation of calcium and phosphorylation signaling pathways, as well as of lipid transporters and exocytosis-related proteins take place very early in the stress response. Such responses can be coupled to processes aimed at strengthening the cell wall and plasma membrane against disruption. On the contrary, in Jumli Marshi, sugar production, detoxification, ROS scavenging, protection of chloroplast translation, and plausibly the activation of the jasmonic acid pathway were the very first response activities. These can instead be coupled to detoxification processes.ConclusionsBased on the results inferred from this study, we conclude that different, but overlapping, strategies are undertaken by the two varieties to cope with the chilling stress; in Sijung the initial molecular responses seem to be mainly targeted at strengthening the cell wall and plasma membrane, whereas in Jumli Marshi the protection of chloroplast translation and detoxification is prioritized.

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Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

Comparative Transcriptomics of Sijung and Jumli Marshi Rice during Early Chilling Stress Imply Multiple Protective Mechanisms

et al. 2015

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“…AtWNK2/5/8 regulated flowering time by modulating the photoperiod pathway [55]. Recently, OsWNK1 was found to respond differentially under various abiotic stresses and also showed rhythmic expression profile under diurnal and circadian conditions at the transcription level [56]. The conserved motif of ZIK family proteins in maize were investigated using Clustal X and as shown in Figure 3B, a conserved signature motif GTPEFMAPE (L/V) (Y/F) was found in all members [24].…”

Section: Resultsmentioning

confidence: 99%

Genome-Wide Identification and Analysis of Expression Profiles of Maize Mitogen-Activated Protein Kinase Kinase Kinase

Kong

Zhang

et al. 2013

PLoS ONE

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Mitogen-activated protein kinase (MAPK) cascades are highly conserved signal transduction model in animals, yeast and plants. Plant MAPK cascades have been implicated in development and stress responses. Although MAPKKKs have been investigated in several plant species including Arabidopsis and rice, no systematic analysis has been conducted in maize. In this study, we performed a bioinformatics analysis of the entire maize genome and identified 74 MAPKKK genes. Phylogenetic analyses of MAPKKKs from maize, rice and Arabidopsis have classified them into three subgroups, which included Raf, ZIK and MEKK. Evolutionary relationships within subfamilies were also supported by exon-intron organizations and the conserved protein motifs. Further expression analysis of the MAPKKKs in microarray databases revealed that MAPKKKs were involved in important signaling pathways in maize different organs and developmental stages. Our genomics analysis of maize MAPKKK genes provides important information for evolutionary and functional characterization of this family in maize.

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“…Both AtWNK1 and APRR3 display coincidental rhythmic transcriptome expression. The OsWNK1 transcript level has a cycling pattern similar to that of OsPRR1 – a well‐established marker gene for circadian regulation (Kumar et al ., ) – suggesting mediation of flowering time (Wang et al ., ). The effect of AtWNK1 on flowering time contrasts with that of AtWNK2/5/8 : AtWNK1 promotes CONSTANS and FLOWERING LOCUS T expression while AtWNK2/5/8 suppress them.…”

Section: Functions Of Wnk Family Members In Physiology and Developmentmentioning

confidence: 99%

Nudge‐nudge, WNK‐WNK (kinases), say no more?

et al. 2018

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Contents Summary 35 I Overview of animal and plant WNK kinases 35 II. Structure: domains and topology 36 III. Phylogeny-evolutionary relationships 41 IV. Plant WNK kinase distribution and regulation of WNK expression and activity 41 V. Functions of WNK family members in physiology and development 41 VI. Say no more? Still many questions to be answered 45 Acknowledgements 46 References 46 SUMMARY: WITH NO LYSINE (WNK) kinases are serine/threonine kinases uniquely characterized by an anomalous placement of a catalytic lysine, hence their moniker. In animals, WNK protein kinases play critical roles in protein trafficking of components that mediate renal ion transport processes and regulate osmoregulation of cell volume. In plants, the WNK kinase gene family is larger and more diverse. Recent studies revealed WNK kinase roles in orchestrating the trafficking of an ion channel, a lipid kinase complex in animals, and a heterotrimeric G protein signaling component in plants that is necessary for signal transduction. For this reason, new attention is geared toward investigating the mechanisms adopted by WNK kinases to nudge intracellular proteins to their destinations. In this review, the functions of WNK kinases in protein trafficking are derived from what we have learned from the model organism Arabidopsis thaliana. To place this new idea in context, we provide the predicted WNK kinase structures, their predicted expression patterns, a speculated evolutionary pathway, and the regulatory roles of plant WNKs in transport processes and other physiologies. We brazenly predict that the WNK kinases in both plants and animals will soon be recognized as a nexus for trafficking-based signal transduction.

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Rice WNK1 is regulated by abiotic stress and involved in internal circadian rhythm

Cited by 46 publications

References 22 publications

Comparative Transcriptomics of Sijung and Jumli Marshi Rice during Early Chilling Stress Imply Multiple Protective Mechanisms

Comparative Transcriptomics of Sijung and Jumli Marshi Rice during Early Chilling Stress Imply Multiple Protective Mechanisms

Genome-Wide Identification and Analysis of Expression Profiles of Maize Mitogen-Activated Protein Kinase Kinase Kinase

Nudge‐nudge, WNK‐WNK (kinases), say no more?

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