Abstract
Key message
Enhanced bioactive JA (JA-Ile) accumulation in OsJAZ9 overexpressing rice helps plants tolerate K deficiency.
Abstract
Potassium (K) represents up to 10% of the plant’s total dry biomass, and its deficiency makes plants highly susceptible to both abiotic and biotic stresses. K shortage results in the inhibition of root and shoots growth, but the underlying mechanism of this response is unclear. Our RNA-Seq and qPCR analysis suggested leading roles for JA pathway genes under K deficiency in rice. Notably, K deficiency and JA application produced similar phenotypic and transcriptional responses. Here, we integrated molecular, physiological and morphological studies to analyze the role of OsJAZ9 in JA homeostasis and K deficiency responses. We raised OsJAZ9 over-expression, knockdown, transcriptional reporter, translational reporter and C-terminal deleted translational reporter lines in rice to establish the role of JA signaling in K ion homeostasis. JA profiling revealed significantly increased JA-Ile levels in OsJAZ9 OE lines under K deficiency. Furthermore, we established that OsJAZ9 overexpression and knockdown result in K deficiency tolerance and sensitivity, respectively, by modulating various K transporters and root system architecture. Our data provide evidence on the crucial roles of OsJAZ9 for improving K deficiency tolerance in rice by altering JA levels and JA responses.
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Acknowledgements
A.P.S., P.M., and B.K.P. acknowledge the research fellowship by UGC, CSIR, and DBT, respectively. We thank Dr. Vijayata Singh, CSSRI, Karnal, for help in K and Na estimation. J.G. acknowledges a grant from the INSA-young scientist project. We acknowledge the NIPGR metabolomics facility.
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APS, BKP, and PM conducted experiments and analyzed data. JG designed the project, supervised experiments. APS, BKP, PM, TH, and JG wrote the manuscript.
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Singh, A.P., Pandey, B.K., Mehra, P. et al. OsJAZ9 overexpression modulates jasmonic acid biosynthesis and potassium deficiency responses in rice. Plant Mol Biol 104, 397–410 (2020). https://doi.org/10.1007/s11103-020-01047-2
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DOI: https://doi.org/10.1007/s11103-020-01047-2