The Nodulin 26-like intrinsic membrane protein OsNIP3;2 is involved in arsenite uptake by lateral roots in rice

A - Papers appearing in refereed journals

Chen, Y., Sun, S-K., Tang, Z., Liu, G., Moore, K. L., Maathuis, F. J. M., Miller, A. J., McGrath, S. P. and Zhao, F-J. 2017. The Nodulin 26-like intrinsic membrane protein OsNIP3;2 is involved in arsenite uptake by lateral roots in rice. Journal of Experimental Botany. 68 (11), pp. 3007-3016. https://doi.org/10.1093/jxb/erx165

AuthorsChen, Y., Sun, S-K., Tang, Z., Liu, G., Moore, K. L., Maathuis, F. J. M., Miller, A. J., McGrath, S. P. and Zhao, F-J.
Abstract

Previous studies have shown that the Nodulin 26-like intrinsic membrane protein (NIP) Lsi1 (OsNIP2;1) is involved in arsenite [As(III)] uptake in rice (Oryza sativa). However, the role of other rice NIPs in As(III) accumulation in planta remains unknown. In the present study, we investigated the role OsNIP3;2 in As(III) uptake in rice. When expressed in Xenopus laevis oocytes, OsNIP3;2 showed a high transport activity for As(III). Quantitative real-time RT-PCR showed that the expression of OsNIP3;2 was suppressed by 5 µM As(III), but enhanced by 20 and 100 µM As(III). Transgenic rice plants expressing OsNIP3;2pro-GUS showed that the gene was predominantly expressed in the lateral roots and the stele region of the primary roots. Transient expression of OsNIP3;2:GFP fusion protein in rice protoplasts showed that the protein was localized in the plasma membrane. Knockout of OsNIP3;2 significantly decreased As concentration in the roots, but had little effect on shoot As concentration. Synchrotron microfocus X-ray fluorescence showed decreased As accumulation in the stele of the lateral roots in the mutants compared with wild-type. Our results indicate that OsNIP3;2 is involved in As(III) uptake by lateral roots, but its contribution to As accumulation in the shoots is limited.

KeywordsArsenic; Nodulin 26-like intrinsic membrane proteins (NIPs); Rice; Uptake; Lateral root; Arsenite
Year of Publication2017
JournalJournal of Experimental Botany
Journal citation68 (11), pp. 3007-3016
Digital Object Identifier (DOI)https://doi.org/10.1093/jxb/erx165
Web address (URL)https://academic.oup.com/jxb/article/68/11/3007/3826984
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeNIP aquaporins: new tools to reduce rice arsenic accumulation
Output statusPublished
Publication dates
Online15 May 2017
Publication process dates
Accepted18 Apr 2017
PublisherOxford University Press (OUP)
ISSN0022-0957

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