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Journal Article
Research Support, Non-U.S. Gov't
Molecular and physiological characterization of AtHIGD1 in Arabidopsis.
Biochemical and Biophysical Research Communications 2017 June 11
Flooding is a principal stress that limits plant productivity. The sensing of low oxygen levels (hypoxia) plays a critical role in the signaling pathway that functions in plants in flooded environments. In this study, to investigate hypoxia response mechanisms in Arabidopsis, we identified three hypoxia-related genes and subjected one of these genes, Arabidopsis thaliana HYPOXIA-INDUCED GENE DOMAIN 1 (AtHIGD1), to molecular characterization including gene expression analysis and intracellular localization of the encoded protein. AtHIGD1 was expressed in various organs but was preferentially expressed in developing siliques. Confocal microscopy of transgenic plants harboring eGFP-tagged AtHIGD1 indicated that AtHIGD1 is localized to mitochondria. Importantly, plants overexpressing AtHIGD1 exhibited increased resistance to hypoxia compared to wild type. Our results represent the first report of a biological function for an HIGD protein in plants and indicate that AtHIGD1 is a mitochondrial protein that plays an active role in mitigating the effects of hypoxia on plants.
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