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Journal of Integrative Agriculture  2026, Vol. 25 Issue (7): 2701-2713    DOI: 10.1016/j.jia.2024.08.029
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Filament-like plant protein 7 (FPP7) negatively regulates rice salt tolerance by enhancing abscisic acid sensitivity and disturbing sodium and ROS homeostasis

Fan Fan1*, Jin Chen3*, Lingyue Yan1, Wenjie Hu1, Xue Liu1, Jia Zeng4, Ling Liu1, Ting Liu1, Nenghui Ye1#, Dingyang Yuan3#, Meijuan Duan1, 2#

1 College of Agriculture, Hunan Agricultural University, Changsha 410128, China

2 Yuelushan Laboratory, Changsha 410128, China

3 State Key Laboratory of Hybrid Rice/Hunan Hybrid Rice Research Center, Hunan Academy of Agricultural Sciences, Changsha 410125, China

4 Longping Branch, College of Biology, Hunan University, Changsha 410125, China

 Highlights 
First identification of 59 filament-like plant proteins (FPP) genes across six plant species, revealing their conserved evolutionary patterns in monocots.
The rice OsFPP7 gene negatively regulates salt tolerance, impacting seed germination and seedling growth.
OsFPP7 influences rice salt tolerance by regulating abscisic acid signaling, ion homeostasis, and reactive oxygen species balance.
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摘要  

植物丝状蛋白是一种中间丝蛋白,在植物的发育和生长过程中发挥着重要作用。然而,目前尚未对植物FPP 家族进行系统鉴定和表征。本研究通过分析两种双子叶植物和四种单子叶植物的基因组,发现了 59 FPP 候选基因。系统进化分析和共线性图谱显示,FPP基因在单子叶植物中进化相对保守。其中,水稻 8 OsFPP 成员均会被非生物胁迫诱导或抑制。遗传学证据表明,过表达OsFPP7水稻植株在芽期受到盐胁迫时ABA敏感性增加、Na+/K+活性氧平衡被破坏。而敲除 OsFPP7 通过弱植株 ABA 的敏感性以及保护抗氧化系统和钠离子转运系统,从而提高水稻耐盐性。研究结果进一步阐明了细胞骨架、FPP调控盐胁迫功能以及植物抗逆机制之间的关联



Abstract  

Filament-like plant proteins are intermediate filament proteins that play a major role in the development and growth of plants.  However, no studies have systematically identified or characterized the filament-like plant proteins (FPP) family in plants.  Fifty-nine FPP candidates were found in this study by analyzing the genomes of two dicots and four monocots.  Phylogenetic analysis and multicollinearity mapping showed the relatively conserved evolution of FPP genes in monocots.  In rice, eight OsFPPs were characterized and found to be induced or repressed by abiotic stresses.  Additional genetic evidence showed that OsFPP7-overexpressing rice exhibited increased sensitivity to abscisic acid during the germination stage, disrupted Na+/K+ homeostasis, and disrupted balance of reactive oxygen species during the seedling stage when exposed to salt stress.  Conversely, the knockout of osfpp7 alleviated abscisic acid (ABA) sensitivity, safeguarded the antioxidant system and sodium ion transport system, and thus enhanced rice salt tolerance.  In the cytoskeleton, the functions of FPPs in controlling salt stress and plant stress tolerance mechanisms are all further elucidated by our findings.

Keywords:  OsFPP7       abscisic acid        Na+ homeostasis        reactive oxygen species homeostasis        rice (Oryza sativa L.)  
Received: 02 May 2024   Accepted: 01 July 2024 Online: 30 August 2024  
Fund: 

This work was supported by the Science and Technology Innovation Program of Hunan Province, China (2024NK1010 and 2023NK1010), the National Natural Science Foundation of China (U21A20208), the Hunan Seed Industry Innovation Project, China (2021NK1012), the National Key R&D Project of Hunan Province, China (2023NK2002), the Hunan Science and Technology Major Project, China (2023ZJ1080), the Natural Science Foundation of Hunan Province, China (2022JJ40170), and the Major Scientific and Technological Project of Hainan Province, China (ZDKJ2021002).

About author:  Fan Fan, E-mail: fanfanchn9@163.com; Jin Chen, E-mail: jinchen_0704@163.com; #Correspondence Nenghui Ye, E-mail: nye@hunau.edu.cn; Dingyang Yuan, E-mail: yuandingyang@hhrrc.ac.cn; Meijuan Duan, E-mail: duanmeijuan@163.com * These authors contributed equally to this study.

Cite this article: 

Fan Fan, Jin Chen, Lingyue Yan, Wenjie Hu, Xue Liu, Jia Zeng, Ling Liu, Ting Liu, Nenghui Ye, Dingyang Yuan, Meijuan Duan. 2026. Filament-like plant protein 7 (FPP7) negatively regulates rice salt tolerance by enhancing abscisic acid sensitivity and disturbing sodium and ROS homeostasis. Journal of Integrative Agriculture, 25(7): 2701-2713.

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