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Proc Natl Acad Sci U S A. 2005 Aug 30;102(35):12612-7. Epub 2005 Aug 17.

Generation of phytate-free seeds in Arabidopsis through disruption of inositol polyphosphate kinases.

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1
Department of Pharmacology and Cancer Biology, Howard Hughes Medical Institute, Duke University Medical Center, Durham, NC 27710, USA.

Abstract

Phytate (inositol hexakisphosphate, IP6) is a regulator of intracellular signaling, a highly abundant animal antinutrient, and a phosphate store in plant seeds. Here, we report a requirement for inositol polyphosphate kinases, AtIPK1 and AtIPK2beta, for the later steps of phytate synthesis in Arabidopsis thaliana. Coincident disruption of these kinases nearly ablates seed phytate without accumulation of phytate precursors, increases seed-free phosphate by 10-fold, and has normal seed yield. Additionally, we find a requirement for inositol tetrakisphosphate (IP4)/inositol pentakisphosphate (IP5) 2-kinase activity in phosphate sensing and root hair elongation. Our results define a commercially viable strategy for the genetic engineering of phytate-free grain and provide insights into the role of inositol polyphosphate kinases in phosphate signaling biology.

PMID:
16107538
PMCID:
PMC1194928
DOI:
10.1073/pnas.0504172102
[Indexed for MEDLINE]
Free PMC Article
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