Abstract
BackgroundNitrogen and potassium are crucial supplements for plant development and growth. Plants can detect potassium and nitrate ions in soils and in like way, they modify root-to-shoot transport of these ions to adjust the conveyance among roots and shoots. Transcription factor MYB59 plays essential roles in numerous physiological processes inclusive of hormone response, abiotic stress tolerance, plant development, and metabolic regulation. In this study, we retrieved 56 MYB59 proteins from different plant species. Multiple sequence alignment, phylogenetic tree, conserved motif, chromosomal localization, and cis-regulatory elements of the retrieved sequences were analyzed. Gene structure, protein 3D structure, and DNA binding of OsMYB59 indica were also predicted. Finally, we characterized OsMYB59 and its function under low K+/NO3− conditions in Oryza sativa subsp. indica. ResultsData analysis showed that MYB59s from various groups separated in terms of conserved functional domains and gene structure, where members of genus Oryza clustered together. Plants showed reduced height and yellowish appearance when grown on K+ and NO3− deficient medium. Quantitative real-time PCR uncovered that the OsMYB59 reacted to abiotic stresses where its expression was increased in BRRI dhan56 but decreased in other varieties on K+ deficient medium. In addition, OsMYB59 transcript level increased on NO3− deficient medium. ConclusionsOur results can help to explain the biological functions of indica rice MYB59 protein and gave a theoretical premise to additionally describe its biological roles in response to abiotic stresses particularly drought.
Highlights
Nitrogen and potassium are crucial supplements for plant development and growth
Transcription factor MYB59 participates in many plant biological processes but has not been systematically studied in rice
Real-time quantitative Polymerase chain reaction (PCR) analysis of the OsMYB59 gene subjected to various stressors revealed that they are induced in response to external K+ and NO3− levels and depend on the stress responsiveness of the drought and salttolerant varieties
Summary
Plants can detect potassium and nitrate ions in soils and in like way, they modify root-to-shoot transport of these ions to adjust the conveyance among roots and shoots. Transcription factor MYB59 plays essential roles in numerous physiological processes inclusive of hormone response, abiotic stress tolerance, plant development, and metabolic regulation. Abiotic stress, such as drought, submergence, salt, temperature, and other environmental extremes, affects the majority of plants. Drought stress limits the development of roots in plants and the diffusion rates of potassium ions (K+) toward the roots in the soil, restricting the K uptake. During this reduction in K+ levels, plants resilience to drought stress and K+ absorption might be further depressed. Nitrate (NO3−) is the most common type of
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