Expression and functions of myo-inositol monophosphatase family genes in seed development of Arabidopsis
スポンサーリンク
概要
- 論文の詳細を見る
Myo-inositol monophosphatase (IMP) catalyzes the dephosphorylation of myo-inositol 3-phosphate in the last step of myo-inositol biosynthesis. IMP is also important in phosphate metabolism and is required for the biosynthesis of cell wall polysaccharides, phytic acid, and phosphatidylinositol. In Arabidopsis, IMP is encoded by VTC4. There are, however, two additional IMP candidate genes, IMPL1 and IMPL2, which have not yet been elucidated. In our genetic studies of Arabidopsis IMP genes, only the loss-of-function mutant impl2 showed embryonic lethality at the globular stage. All IMP genes were expressed in a similar manner both in the vegetative and reproductive organs. In developing seeds, expression of IMP genes was not coupled with the expression of the genes encoding myo-inositol phosphate synthases, which supply the substrate for IMPs in the de novo synthesis pathway. Instead, expression of IMP genes was correlated with expression of the gene for myo-inositol polyphosphate 1-phosphatase (SAL1), which is involved in the myo-inositol salvage pathway, suggesting a possible salvage pathway role in seed development. Moreover, the partial rescue of the impl2 phenotype by histidine application implies that IMPL2 is also involved in histidine biosynthesis during embryo development.
- 2011-05-01
著者
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Nakajima N
National Inst. For Environmental Studies Ibaraki Jpn
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Tamaoki Masanori
Biodiversity Conservation Research Project
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Satoh Shinobu
Graduate School Of Life And Environmental Science University Of Tsukuba
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Iwai Hiroaki
Graduate School Of Life And Environmental Science University Of Tsukuba
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Yazawa Katsumi
Graduate School Of Life And Environmental Science University Of Tsukuba
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SATO YUKO
Graduate School of Natural Science and Technology, Kanazawa University
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Tamaoki Masanori
National Inst. Environmental Studies Ibaraki Jpn
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Satoh Shinobu
Univ. Tsukuba Ibaraki Jpn
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Iwai Hiroaki
Univ. Tsukuba Ibaraki Jpn
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Ishii Tadashi
Forestry And Forest Products Res. Inst. Ibaraki Jpn
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Nakajima Nobuyoshi
National Inst. Environmental Studies Ibaraki Jpn
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Nakajima N
National Inst. Environmental Studies Ibaraki Jpn
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YAZAWA Katsumi
National Institute of Agrobiological Science
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YOSHIDA Seiji
National Institute for Environmental Studies
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Yamakawa Seiyei
National Institute For Environmental Studies
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Ishii Tadashi
Forest Products. Res. Inst. Ibaraki
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Ishii Tadashi
Forest And Forest Products Research Institute
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Sato Yuko
Graduate School Of Life And Environmental Sciences University Of Tsukuba
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Satoh Shinobu
Graduate School Of Life And Environmental Sci. Univ. Of Tsukuba
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