Ustilaginoidea virens is a causal agent of rice false smut disease which hampers the global rice production. This pathogen is able to continually reach into the central vascular tissues and is able to hijack nutrients from the host plants. It is known that during the later stage of U. virens colonization, the floral region particularly the basal area which is having conducive micro-environment in terms of nutrients and moisture content witnessed the presence of a dense mass of mycelia. Nevertheless, the mechanism which underlies U. virens infection in relation to sugar transport is not well established using a molecular approach. Here, we analyzed contents of sugar that are present in leaves pre and post U. virens infection using a transgenic Arabidopsis thaliana leaves containing increased levels of ATP and sucrose. Glucose and sucrose contents in the leaves of the transgenic Arabidopsis lines were significantly increased compared to WT after U. virens infection, suggesting that U. virens growth and translocation of sugar are directly linked. From the four A. thaliana SWEET genes tested, two AtSWEETs which belong to Clade III were up-regulated significantly upon U. virens infection particularly in the OE7 transgenic line. Our studies suggest that active sugar translocation between the sugar producing tissues probably was triggered by U. virens infection, and the identified SWEET family genes are directly involved in facilitating this process.

中文翻译：

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水稻假丝菌感染过程中拟南芥SWEET基因在转基因拟南芥中的表达水平升高，其中ATP和蔗糖水平升高

Ustilaginoidea virens是造成稻米虚假黑穗病的病因，它阻碍了全球稻米的生产。这种病原体能够不断地到达中央血管组织，并能够劫持宿主植物中的养分。已知在U.virens定植的后期，在营养和水分含量方面具有有利的微环境的花卉区域，特别是基部区域，见证了密集的菌丝体的存在。然而，使用分子方法还不能很好地确定与糖运输有关的维纳斯病毒感染的基础机制。在这里，我们使用转基因技术分析了在维尔纽斯感染前后叶片中存在的糖分拟南芥叶中含有增加的ATP和蔗糖水平。葡萄糖和在转基因的叶子蔗糖含量拟南芥系显著增加相比于WT之后U.病菌感染，这表明U.霉糖的生长和转移有直接的联系。从四个拟南芥SWEET基因测试中，两个AtSWEETs属于进化枝III分别在显著上调U.霉特别是在转基因OE7线感染。我们的研究表明，产糖组织之间的活性糖易位可能是由U. virens感染引起的，SWEET家族基因直接参与促进这一过程。