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• W4378348153 abstract "Phosphorus (P) is a growth-limiting nutrient for plants, which is taken up by root tissue from the environment as inorganic phosphate (Pi). To maintain an appropriate status of cellular Pi, plants have developed sophisticated strategies to sense the Pi level and modulate their root system architecture (RSA) under the ever-changing growth conditions. However, the molecular basis underlying the mechanism remains elusive. Inositol polyphosphate kinase (IPK2) is a key enzyme in the inositol phosphate metabolism pathway, which catalyzes the phosphorylation of IP3 into IP5 by consuming ATP. In this study, the functions of a rice inositol polyphosphate kinase gene (OsIPK2) in plant Pi homeostasis and thus physiological response to Pi signal were characterized. As a biosynthetic gene for phytic acid in rice, overexpression of OsIPK2 led to distinct changes in inositol polyphosphate profiles and an excessive accumulation of Pi levels in transgenic rice under Pi-sufficient conditions. The inhibitory effects of OsIPK2 on root growth were alleviated by Pi-deficient treatment compared with wild-type plants, suggesting the involvement of OsIPK2 in the Pi-regulated reconstruction of RSA. In OsIPK2-overexpressing plants, the altered acid phosphatase (APase) activities and misregulation of Pi-starvation-induced (PSI) genes were observed in roots under different Pi supply conditions. Notably, the expression of OsIPK2 also altered the Pi homeostasis and RSA in transgenic Arabidopsis. Taken together, our findings demonstrate that OsIPK2 plays an important role in Pi homeostasis and RSA adjustment in response to different environmental Pi levels in plants." @default.
• W4378348153 created "2023-05-27" @default.
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• W4378348153 date "2023-05-26" @default.
• W4378348153 modified "2023-10-16" @default.
• W4378348153 title "<i>OsIPK2</i>, a Rice Inositol Polyphosphate Kinase Gene, Is Involved in Phosphate Homeostasis and Root Development" @default.
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• W4378348153 doi "https://doi.org/10.1093/pcp/pcad052" @default.
• W4378348153 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37233621" @default.
• W4378348153 hasPublicationYear "2023" @default.
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