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首页> 外文期刊>Journal of Experimental Botany >Altered sucrose synthase and invertase expression affects the local and systemic sugar metabolism of nematode-infected Arabidopsis thaliana plants
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Altered sucrose synthase and invertase expression affects the local and systemic sugar metabolism of nematode-infected Arabidopsis thaliana plants

机译：蔗糖合酶和转化酶表达的改变影响线虫感染拟南芥植物的局部和全身糖代谢

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摘要

Sedentary endoparasitic nematodes of plants induce highly specific feeding cells in the root central cylinder. From these, the obligate parasites withdraw all required nutrients. The feeding cells were described as sink tissues in the plants circulation system that are supplied with phloem-derived solutes such as sugars. Currently, there are several publications describing mechanisms of sugar import into the feeding cells. However, sugar processing has not been studied so far. Thus, in the present work, the roles of the sucrose-cleaving enzymes sucrose synthases (SUS) and invertases (INV) in the development of Heterodera schachtii were studied. Gene expression analyses indicate that both enzymes are regulated transcriptionally. Nematode development was enhanced on multiple INV and SUS mutants. Syncytia of these mutants were characterized by altered enzyme activity and changing sugar pool sizes. Further, the analyses revealed systemically affected sugar levels and enzyme activities in the shoots of the tested mutants, suggesting changes in the sourcesink relationship. Finally, the development of the root-knot nematode Meloidogyne javanica was studied in different INV and SUS mutants and wild-type Arabidopsis plants. Similar effects on the development of both sedentary endoparasitic nematode species (root-knot and cyst nematode) were observed, suggesting a more general role of sucrose-degrading enzymes during plantnematode interactions.
机译：久坐不动的植物寄生线虫在根中央圆柱体中诱导高度特异性的饲养细胞。从这些，专性寄生虫撤回所有必需的营养素。进食细胞被描述为植物循环系统中的汇水组织，向其供应了韧皮部衍生的溶质（如糖）。当前，有几篇出版物描述了糖进入饲养细胞的机制。但是，迄今为止尚未研究糖加工。因此，在目前的工作中，研究了蔗糖裂解酶蔗糖合酶（SUS）和转化酶（INV）在Schachtii的发展中的作用。基因表达分析表明这两种酶均受转录调控。在多个INV和SUS突变体上，线虫的发育得到增强。这些突变体的合胞体特征在于酶活性的改变和糖池大小的改变。此外，分析揭示了受试突变体芽中的糖水平和酶活性受到系统性影响，表明来源-贮藏关系的变化。最后，在不同的INV和SUS突变体以及野生型拟南芥植物中研究了根结线虫Meloidogyne javanica的发育。观察到对两种久坐的内寄生线虫物种（根结线虫和囊肿线虫）发育的相似影响，表明在植物线虫相互作用期间蔗糖降解酶的作用更为普遍。

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