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Volume electron microscopy reconstruction uncovers a physical barrier that limits virus to phloem

文献类型： 外文期刊

作者： Lv, Mingfang 1 ; Dai, Yuanxing 1 ; Xie, Li 3 ; Guo, Jiansheng 5 ; Liao, Zhenfeng 7 ; Shang, Weina 3 ; Zhao, Xiaohuan 3 ; Hong, Jian 3 ; Zhang, Heng-Mu 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, Hangzhou 310021, Peoples R China

2.Zhejiang Normal Univ, Coll Chem & Life Sci, Jinhua 321004, Peoples R China

3.Zhejiang Univ, Anal Ctr Agrobiol & Environm Sci, Hangzhou 310058, Peoples R China

4.Zhejiang Univ, Coll Agr Sci, Hangzhou 310058, Peoples R China

5.Zhejiang Univ, Sch Med, Dept Biophys, Hangzhou 310058, Peoples R China

6.Zhejiang Univ, Ctr Cryo Electron Microscopy, Hangzhou 310058, Peoples R China

7.Zhejiang Acad Agr Sci, Publ Lab, Hangzhou 310021, Peoples R China

关键词： flexible gateway (FL); phloem limitation; plasmodesmal connection; size-dependent physical barrier; virus-induced tumors

期刊名称：NEW PHYTOLOGIST （ 影响因子：9.4； 五年影响因子：10.5 ）

ISSN： 0028-646X

年卷期： 2023 年

页码：

收录情况： SCI

摘要： center dot Most plant reoviruses are phloem-limited, but the mechanism has remained unknown for more than half a century. Southern rice black-streaked dwarf virus (Fijivirus, Reoviridae) causes phloem-derived tumors, where its virions, genomes, and proteins accumulate, and it was used as a model to explore how its host plant limits the virus within its phloem.center dot High-throughput volume electron microscopy revealed that only sieve plate pores and flexible gateways rather than plasmodesmata had a sufficiently large size exclusion limit (SEL) to accommodate virions and potentially serve as pathways of virion movement.center dot The large SEL gateways were enriched within the proliferated sieve element (SE) layers of tumors. The lack of such connections out of the SE-enriched regions of tumors defined a size-dependent physical barrier to high flux transportation of virions.center dot A working model is proposed to demonstrate the mechanism underlying limitation of virus within phloem.

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