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A novel rice protein family of OsHIGDs may be involved in early signalling of hypoxia-promoted stem growth in deepwater rice

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Abstract

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OsHIGDs was identified as a novel hypoxia-responsive protein family. Among them, OsHIGD2 is characterized as a mitochondrial protein and is related to hypoxia signalling through interacting with mitochondrial proteins of critical functions in reducing cell damages caused by hypoxia.

Abstract

Recent evidence supports ethylene as a key factor in modulating plant responses to submergence stress. Meanwhile, there has been general consent that ethylene is not the only signal for the submergence-induced stem growth. In this study, we confirmed that hypoxia also promotes stem elongation in deepwater rice even in the absence of ethylene. As components of ethylene-independent hypoxia signalling, five HIGD (hypoxia-induced gene domain) protein genes were identified. Among the genes, OsHIGD2 showed the fastest and strongest induction by hypoxia as well as submergence. Co-expression analysis indicated that OsHIGD2 had a simultaneous expression pattern with fermentation-related genes, such as ADH1 (alcohol dehydrogenase 1) and PDC2 (pyruvate decarboxylase 2). Transient expression of OsHIGD2 in leaf epidermal cells of Nicotiana benthamiana provided evidence that the protein is localized to mitochondria. We further identified OsHIGD2-interacting proteins through the yeast two-hybrid assay using OsHIGD2 as bait. As a result, three mitochondrial proteins were discovered that function in the regulation of redox potential or reduction of protein damages caused by reactive oxygen species. In this report, we propose that OsHIGD2 is a mitochondrial protein which takes part in the early stage of hypoxia signalling by interacting with proteins that are related to oxygen utilization.

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Acknowledgments

We thank Prof Julia Bailey-Serres at UC Riverside, the USA for the advice and discussion about the entire research. This research was carried out with the support of “Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ011674012016)” Rural Development Administration, Republic of Korea.

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Authors and Affiliations

  1. Department of Biology, Kunsan National University, Gunsan, 54150, Korea

    Soong-Taek Hwang & Dongsu Choi

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  1. Soong-Taek Hwang
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  2. Dongsu Choi
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Correspondence to Dongsu Choi.

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Communicated by Y.-Il. Park.

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Hwang, ST., Choi, D. A novel rice protein family of OsHIGDs may be involved in early signalling of hypoxia-promoted stem growth in deepwater rice. Plant Cell Rep 35, 2021–2031 (2016). https://doi.org/10.1007/s00299-016-2013-z

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  • DOI: https://doi.org/10.1007/s00299-016-2013-z

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