Tumours induced by a plant virus are derived from vascular tissue and have multiple intercellular gateways that facilitate virus movement

文献类型： 外文期刊

第一作者： Xie, Li

作者： Xie, Li;Lv, Ming-Fang;Zhang, Heng-Mu;Yang, Jian;Li, Jun-Min;Chen, Jian-Ping

作者机构：

关键词： Intercellular gateways;sieve elements;tumours;vascularization;virus-induced tumours;virus movement

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2014 年 65 卷 17 期

页码：

收录情况： SCI

摘要： Structural studies showed that tumours induced by Southern rice black-streaked dwarf virus (SRBSDV; genus Fijivirus, family Reoviridae) were highly organized, modified phloem, composed of sclerenchyma, vessels, hyperplastic phloem parenchyma and sieve elements (SEs). Only parenchyma and SEs were invaded by the virus. There was a special region that consisted exclusively of SEs without the usual companion cells and a new flexible type of intercellular gateway was observed on all SE-SE interfaces in this region. These flexible gateways significantly increased the intercellular contacts and thus enhanced potential symplastic transport in the tumour. Flexible gateways were structurally similar to compressed plasmodesmata but were able to accommodate complete SRBSDV virions (similar to 80 nm diameter). Virions were also found in sieve-pore gateways, providing strong evidence for the movement of a virus with large virions within phloem tissue and suggesting that the unusual neovascularization of plant virus-induced tumours facilitated virus spread. A working model for the spread of tumour-inducing reoviruses in plants is presented.

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