Development and maintenance of terminal sink tissues with an emphasis on nematode-induced feeding sites

植物寄生的定居线虫从高度专门化的进食结构中从宿主那里吸取营养。在胞囊线虫的情况下，当细胞与相邻细胞融合形成合胞体时，这些进食部位就会发育。根结线虫的取食部位由单个巨细胞组成。这两种摄食结构的发育不同，但功能上是同源的。本提案的主题是确定营养物质进入这些摄食部位的装载是否通过转运蛋白介导的过程发生在质外体，或通过胞间连丝发生在共质体。将确定涉及摄食部位类型形成和维持的组织类型。将在两种取食位点类型中比较不同线虫调节基因和蛋白质的表达。将检查线虫诱导的氨基酸转运蛋白的调节和运输。计划中的实验将有助于了解植物中的终端库组织是如何形成，维持和提供营养的。

Plant-parasitic sedentary nematodes withdraw nutrients from their hosts from highly specialized feeding structures. In the case of cyst nematodes these feeding sites develop when cells fuse with adjacent cells forming a syncytium. The feeding sites of root knot nematodes consist of individual giant cells. Both feeding structures develop differently but are functionally homologous. The topic of this proposal is to establish if the loading of nutrients into these feeding sites occurs apoplasmically through transporter-mediated processes or symplasmically through plasmodesmata. Tissue types involved in formation and maintenance of the feeding site types will be identified. The expression of different nematode regulated genes and proteins will be compared in both feeding site types. The regulation and the trafficking of a nematode-induced amino acid transporter will be examined. The planned experiments will help to understand how terminal sink tissues in plants are formed, maintained and supplied with nutrients.