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Transcriptional regulation of phosphate acquisition by higher plants

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Abstract

Phosphorus (P), an essential macronutrient required for plant growth and development, is often limiting in natural and agro-climatic environments. To cope with heterogeneous or low phosphate (Pi) availability, plants have evolved an array of adaptive responses facilitating optimal acquisition and distribution of Pi. The root system plays a pivotal role in Pi-deficiency-mediated adaptive responses that are regulated by a complex interplay of systemic and local Pi sensing. Cross-talk with sugar, phytohormones, and other nutrient signaling pathways further highlight the intricacies involved in maintaining Pi homeostasis. Transcriptional regulation of Pi-starvation responses is particularly intriguing and involves a host of transcription factors (TFs). Although PHR1 of Arabidopsis is an extensively studied MYB TF regulating subset of Pi-starvation responses, it is not induced during Pi deprivation. Genome-wide analyses of Arabidopsis have shown that low Pi stress triggers spatiotemporal expression of several genes encoding different TFs. Functional characterization of some of these TFs reveals their diverse roles in regulating root system architecture, and acquisition and utilization of Pi. Some of the TFs are also involved in phytohormone-mediated root responses to Pi starvation. The biological roles of these TFs in transcriptional regulation of Pi homeostasis in model plants Arabidopsis thaliana and Oryza sativa are presented in this review.

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Acknowledgments

This work was supported by USDA grant (to K.G.R.) and by the Ministry of Science and Technology, Department of Biotechnology, Government of India (Ramalingaswamy Fellowship [2009] to A.J.).

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  1. National Research Centre on Plant Biotechnology, Lal Bahadur Shastri Building, PUSA Campus, New Delhi, 110012, India

    Ajay Jain

  2. Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, 47907-1165, USA

    Vinay K. Nagarajan & Kashchandra G. Raghothama

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  1. Ajay Jain
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Correspondence to Kashchandra G. Raghothama.

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Jain, A., Nagarajan, V.K. & Raghothama, K.G. Transcriptional regulation of phosphate acquisition by higher plants. Cell. Mol. Life Sci. 69, 3207–3224 (2012). https://doi.org/10.1007/s00018-012-1090-6

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