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Kuo, H.-F., Hsu, Y.-Y., Lin, W.-C., Chen, K.-Y., Munnik, T., Brearley, C. A.* and Chiou, T.-J.* (2018) Arabidopsis inositol phosphate kinases, IPK1 and ITPK1, constitute a metabolic pathway in maintaining phosphate homeostasis. The Plant J. (doi:10.1111/tpj.13974)
Emerging studies have implicated a close link between inositol phosphate (InsP) metabolism and cellular phosphate (Pi) homeostasis in eukaryotes; however, whether a common InsP species is deployed as an evolutionarily conserved metabolic messenger to mediate Pi signaling remains unknown. Here, using genetics and InsP profiling combined with Pi starvation response (PSR) analysis in Arabidopsis thaliana, we showed that the kinase activity of inositol pentakisphosphate 2-kinase (IPK1), an enzyme required for phytate (inositol hexakisphosphates; InsP6) synthesis, is indispensable for maintaining Pi homeostasis under Pi-replete conditions, and inositol 1,3,4-trisphosphate 5/6-kinase 1 (ITPK1) plays an equivalent role. Although both ipk1-1 and itpk1 mutants exhibited decreased levels of InsP6 and diphosphoinositol pentakisphosphate (PP-InsP5; InsP7), disruption of another ITPK family enzyme, ITPK4, which correspondingly caused depletion of InsP6 and InsP7, did not display similar Pi-related phenotypes, which precludes these InsP species as effectors. Notably, the level of D/L-Ins(3,4,5,6) P4 was concurrently elevated in both ipk1-1 and itpk1 mutants, which showed a specific correlation to the misregulated Pi phenotypes. However, the level of D/L-Ins(3,4,5,6)P4 is not responsive to Pi starvation that instead manifests a shoot-specific increase in InsP7 level. This study demonstrates a more nuanced picture of the intersection of InsP metabolism and Pi homeostasis and PSR than has previously been elaborated and additionally establishes intermediate steps to phytate biosynthesis in plant vegetative tissues. link
Frontiers in BioAgricultural Research: The 20th Anniversary of the Agricultural Biotechnology Research Center, Academia Sinica

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2018/09/03 ABRC Seminar

2018/08/22 ABRC Seminar 本中心與東海大學生命科學研究中心教研合作協議簽約儀式 2018/06/11 ABRC Seminar

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*2018/10/18 10:30 AM
Dr. Simon Gilroy (Professor, Department of Botany, University of Wisconsin, USA)
Life without gravity: Plant stress biology on the International Space Station
Auditorium A134, Agricultural Technology Building, Agricultural Biotechnology Research Center

*2018/10/19 9:00 AM~9:45 AM
Dr. Kuo-Chen Yeh (Research Fellow and Interim Director, Agricultural Biotechnology Research Center, Academia Sinica)
Heavy metal homeostasis in plants and applications
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Ming-Jung Liu*, Koichi Sugimoto, Sahra Uygun, Nicholas Panchy, Michael S. Campbell, Mark Yandell, Gregg A. Howe and Shin-Han Shiu* (2018). Regulatory divergence in wound-responsive gene expression between domesticated and wild tomato. Plant Cell DOI: http://www.plantcell.org/content/early/2018/05/09/tpc.18.00194

Sakthivel Kailasam, Ying Wang, Jing-Chi Lo, Hsin-Fang Chang and Kuo-Chen Yeh* (2018) S-nitrosoglutathione works downstream of nitric oxide to mediate iron deficiency signaling in Arabidopsis The Plant Journal, DOI: 10.1111/tpj.13850

Hsiang-chin Liu†, Jörn Lämke†, Siou-ying Lin†, Meng-Ju Hung, Kuan-Ming Liu, Yee-yung Charng*, Isabel Bäurle* (2018) Distinct heat shock factors and chromatin modifications mediate the organ-autonomous transcriptional memory of heat stress. Plant J. https://doi.org/10.1111/tpj.13958

Lin W-Y, Lin Y-Y, Chiang S-F, Syu C, Hsieh L-C*, Chiou T-J* (2018) Evolution of microRNA827 targeting in the plant kingdom. New Phytologist 217: 1712-1725

Leong, S. J., Lu, W.-C. and Chiou, T.-J.* (2018) Phosphite-Mediated Suppression of Anthocyanin Accumulation Regulated by Mitochondrial ATP Synthesis and Sugar in Arabidopsis. Plant & Cell Physiology 59: 1158-1169

Background: Two related species accumulate differences between each other over time. If one of the species is domesticated due to human selection of desirable traits, the domesticated species experiences a 'bottleneck' where many traits present in the related wild species are lost because only a few individuals are targeted for selection. ...more
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