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A magnesium efflux transporter required for seed development and eating quality in rice.

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Title: A magnesium efflux transporter required for seed development and eating quality in rice.
Authors: Huang, Sheng1,2, Hori, Kiyosumi3, Yamaji, Naoki2, Yoshioka, Yuma4, Ning, Min2, Nagaya, Yu4, Miyaji, Takaaki4,5, Mitani-Ueno, Namiki2, Inoue, Shin-ichiro6, Kim, June-Sik2,7, Kashino, Miho2, Ma, Jian Feng2 maj@rib.okayama-u.ac.jp
Source: Proceedings of the National Academy of Sciences of the United States of America. 4/28/2026, Vol. 123 Issue 17, p1-7. 7p.
Subjects: Seed development, Magnesium ions, Food quality, Magnesium, Rice seeds
Abstract: As a staple food for half the world's population, rice is an important dietary source of magnesium (Mg), an essential mineral for human health. Enhanced Mg accumulation in rice grains has also been linked to eating quality. However, the mechanisms underlying Mg transport to the grains remains poorly understood. Here, we report that OsMGR2, a member belonging to Magnesium Release (MGR) family, is required for Mg accumulation in rice grains. OsMGR2 encodes a plasma membrane-localized transporter that mediates Mg efflux. OsMGR2 is constitutively and highly expressed in the stele tissues of roots, the phloem region of both enlarged and diffused vascular bundles in nodes, and the ovular vascular trace of caryopses. Knockout of this gene results in decreased root-to-shoot translocation and altered distribution of Mg to different organs; less Mg is allocated to the second newest leaf with high Mg requirement for active photosynthesis. The osmgr2 mutants exhibit decreased Mg accumulation in the grain, which are smaller, lighter, and shriveled, but show increased accumulation in the husk. The eating quality of the mutant grains is significantly decreased compared with the wild-type rice. These results indicate that OsMGR2 plays multiple roles within the rice; facilitating the root-to-shoot Mg translocation, mediating phloem-to-xylem Mg transfer at nodes for preferential distribution to the most active leaf, and exporting Mg from maternal vascular tissues of the caryopsis to the grains, processes essential for grain development and eating quality in rice. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 193737851
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: A magnesium efflux transporter required for seed development and eating quality in rice.
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  Data: <searchLink fieldCode="AR" term="%22Huang%2C+Sheng%22">Huang, Sheng</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Hori%2C+Kiyosumi%22">Hori, Kiyosumi</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Yamaji%2C+Naoki%22">Yamaji, Naoki</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Yoshioka%2C+Yuma%22">Yoshioka, Yuma</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Ning%2C+Min%22">Ning, Min</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Nagaya%2C+Yu%22">Nagaya, Yu</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Miyaji%2C+Takaaki%22">Miyaji, Takaaki</searchLink><relatesTo>4,5</relatesTo><br /><searchLink fieldCode="AR" term="%22Mitani-Ueno%2C+Namiki%22">Mitani-Ueno, Namiki</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Inoue%2C+Shin-ichiro%22">Inoue, Shin-ichiro</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Kim%2C+June-Sik%22">Kim, June-Sik</searchLink><relatesTo>2,7</relatesTo><br /><searchLink fieldCode="AR" term="%22Kashino%2C+Miho%22">Kashino, Miho</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Ma%2C+Jian+Feng%22">Ma, Jian Feng</searchLink><relatesTo>2</relatesTo><i> maj@rib.okayama-u.ac.jp</i>
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  Data: <searchLink fieldCode="DE" term="%22Seed+development%22">Seed development</searchLink><br /><searchLink fieldCode="DE" term="%22Magnesium+ions%22">Magnesium ions</searchLink><br /><searchLink fieldCode="DE" term="%22Food+quality%22">Food quality</searchLink><br /><searchLink fieldCode="DE" term="%22Magnesium%22">Magnesium</searchLink><br /><searchLink fieldCode="DE" term="%22Rice+seeds%22">Rice seeds</searchLink>
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  Data: As a staple food for half the world's population, rice is an important dietary source of magnesium (Mg), an essential mineral for human health. Enhanced Mg accumulation in rice grains has also been linked to eating quality. However, the mechanisms underlying Mg transport to the grains remains poorly understood. Here, we report that OsMGR2, a member belonging to Magnesium Release (MGR) family, is required for Mg accumulation in rice grains. OsMGR2 encodes a plasma membrane-localized transporter that mediates Mg efflux. OsMGR2 is constitutively and highly expressed in the stele tissues of roots, the phloem region of both enlarged and diffused vascular bundles in nodes, and the ovular vascular trace of caryopses. Knockout of this gene results in decreased root-to-shoot translocation and altered distribution of Mg to different organs; less Mg is allocated to the second newest leaf with high Mg requirement for active photosynthesis. The osmgr2 mutants exhibit decreased Mg accumulation in the grain, which are smaller, lighter, and shriveled, but show increased accumulation in the husk. The eating quality of the mutant grains is significantly decreased compared with the wild-type rice. These results indicate that OsMGR2 plays multiple roles within the rice; facilitating the root-to-shoot Mg translocation, mediating phloem-to-xylem Mg transfer at nodes for preferential distribution to the most active leaf, and exporting Mg from maternal vascular tissues of the caryopsis to the grains, processes essential for grain development and eating quality in rice. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1073/pnas.2536813123
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      – Code: eng
        Text: English
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        PageCount: 7
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      – SubjectFull: Seed development
        Type: general
      – SubjectFull: Magnesium ions
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      – SubjectFull: Food quality
        Type: general
      – SubjectFull: Magnesium
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      – SubjectFull: Rice seeds
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      – TitleFull: A magnesium efflux transporter required for seed development and eating quality in rice.
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              Text: 4/28/2026
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