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|a 10.1093/jxb/eraf445
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|a eng
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|a Yang, Yang
|e verfasserin
|4 aut
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|a The Chloroplast-Localized ABC Transporter OsABCB24 Regulates Aleurone Cell Size and Grain Nutritional Quality in Rice by Modulating Auxin Homeostasis
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|c 2025
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|a Text
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|a ƒaComputermedien
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|a Date Revised 08.10.2025
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|a published: Print-Electronic
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|a Citation Status Publisher
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|a © The Author(s) 2025. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For commercial re-use, please contact reprintsoup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.
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|a The aleurone in cereal grains is an outer cell layer enriched with multiple nutrients important for human health. Enhancing the thickness of the aleurone layer through breeding could improve the nutritional value of rice. In this study, we characterized OsABCB24, a member of the ABCB transporter subfamily gene in rice, and its role in regulating aleurone development. Expression profiling revealed that OsABCB24 is predominantly expressed in seedling leaves and developing caryopsis, particularly in aleurone layer cells during grain filling. Subcellular localization analyses via protoplast transfection and immunogold labeling demonstrated that OsABCB24 is localized to the chloroplast. Knockout of OsABCB24 significantly increased thickness of the aleurone cells and elevated the concentrations of minerals such as phosphorus, potassium, zinc, magnesium, and copper in brown rice. Knockout of OsABCB24 also decreased the concentrations of free and conjugated indole-3-acetic acid (IAA) in developing caryopsis and increased the leaf angle by influencing cell proliferation and elongation on the adaxial side of the lamina joint at seedling stage. Leaf angle was less sensitive to exogenous IAA in osabcb24 mutants than in wild type. Taken together, these findings suggest that OsABCB24 is a negative regulator of aleurone cell expansion possibly by modulating auxin homeostasis. OsABCB24 is a promising genetic target for breeding rice with increased aleurone thickness and nutrient concentrations without yield penalty
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|a Journal Article
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|a ABC transporter
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4 |
|a Aleurone
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|a Auxin
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|a Mineral nutrients
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|a OsABCB24
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| 650 |
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|a Rice
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1 |
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|a Tang, Zhong
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Wen-Wen
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Huang, Xin-Yuan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhao, Fang-Jie
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g (2025) vom: 08. Okt.
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|x 1460-2431
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|u http://dx.doi.org/10.1093/jxb/eraf445
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